WordPress 4.7
[autoinstalls/wordpress.git] / wp-includes / class-wp-customize-setting.php
1 <?php
2 /**
3  * WordPress Customize Setting classes
4  *
5  * @package WordPress
6  * @subpackage Customize
7  * @since 3.4.0
8  */
9
10 /**
11  * Customize Setting class.
12  *
13  * Handles saving and sanitizing of settings.
14  *
15  * @since 3.4.0
16  *
17  * @see WP_Customize_Manager
18  */
19 class WP_Customize_Setting {
20         /**
21          * @access public
22          * @var WP_Customize_Manager
23          */
24         public $manager;
25
26         /**
27          * Unique string identifier for the setting.
28          *
29          * @access public
30          * @var string
31          */
32         public $id;
33
34         /**
35          * @access public
36          * @var string
37          */
38         public $type = 'theme_mod';
39
40         /**
41          * Capability required to edit this setting.
42          *
43          * @var string
44          */
45         public $capability = 'edit_theme_options';
46
47         /**
48          * Feature a theme is required to support to enable this setting.
49          *
50          * @access public
51          * @var string
52          */
53         public $theme_supports  = '';
54         public $default         = '';
55         public $transport       = 'refresh';
56
57         /**
58          * Server-side sanitization callback for the setting's value.
59          *
60          * @var callback
61          */
62         public $validate_callback    = '';
63         public $sanitize_callback    = '';
64         public $sanitize_js_callback = '';
65
66         /**
67          * Whether or not the setting is initially dirty when created.
68          *
69          * This is used to ensure that a setting will be sent from the pane to the
70          * preview when loading the Customizer. Normally a setting only is synced to
71          * the preview if it has been changed. This allows the setting to be sent
72          * from the start.
73          *
74          * @since 4.2.0
75          * @access public
76          * @var bool
77          */
78         public $dirty = false;
79
80         /**
81          * @var array
82          */
83         protected $id_data = array();
84
85         /**
86          * Whether or not preview() was called.
87          *
88          * @since 4.4.0
89          * @access protected
90          * @var bool
91          */
92         protected $is_previewed = false;
93
94         /**
95          * Cache of multidimensional values to improve performance.
96          *
97          * @since 4.4.0
98          * @access protected
99          * @var array
100          * @static
101          */
102         protected static $aggregated_multidimensionals = array();
103
104         /**
105          * Whether the multidimensional setting is aggregated.
106          *
107          * @since 4.4.0
108          * @access protected
109          * @var bool
110          */
111         protected $is_multidimensional_aggregated = false;
112
113         /**
114          * Constructor.
115          *
116          * Any supplied $args override class property defaults.
117          *
118          * @since 3.4.0
119          *
120          * @param WP_Customize_Manager $manager
121          * @param string               $id      An specific ID of the setting. Can be a
122          *                                      theme mod or option name.
123          * @param array                $args    Setting arguments.
124          */
125         public function __construct( $manager, $id, $args = array() ) {
126                 $keys = array_keys( get_object_vars( $this ) );
127                 foreach ( $keys as $key ) {
128                         if ( isset( $args[ $key ] ) ) {
129                                 $this->$key = $args[ $key ];
130                         }
131                 }
132
133                 $this->manager = $manager;
134                 $this->id = $id;
135
136                 // Parse the ID for array keys.
137                 $this->id_data['keys'] = preg_split( '/\[/', str_replace( ']', '', $this->id ) );
138                 $this->id_data['base'] = array_shift( $this->id_data['keys'] );
139
140                 // Rebuild the ID.
141                 $this->id = $this->id_data[ 'base' ];
142                 if ( ! empty( $this->id_data[ 'keys' ] ) ) {
143                         $this->id .= '[' . implode( '][', $this->id_data['keys'] ) . ']';
144                 }
145
146                 if ( $this->validate_callback ) {
147                         add_filter( "customize_validate_{$this->id}", $this->validate_callback, 10, 3 );
148                 }
149                 if ( $this->sanitize_callback ) {
150                         add_filter( "customize_sanitize_{$this->id}", $this->sanitize_callback, 10, 2 );
151                 }
152                 if ( $this->sanitize_js_callback ) {
153                         add_filter( "customize_sanitize_js_{$this->id}", $this->sanitize_js_callback, 10, 2 );
154                 }
155
156                 if ( 'option' === $this->type || 'theme_mod' === $this->type ) {
157                         // Other setting types can opt-in to aggregate multidimensional explicitly.
158                         $this->aggregate_multidimensional();
159
160                         // Allow option settings to indicate whether they should be autoloaded.
161                         if ( 'option' === $this->type && isset( $args['autoload'] ) ) {
162                                 self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'] = $args['autoload'];
163                         }
164                 }
165         }
166
167         /**
168          * Get parsed ID data for multidimensional setting.
169          *
170          * @since 4.4.0
171          * @access public
172          *
173          * @return array {
174          *     ID data for multidimensional setting.
175          *
176          *     @type string $base ID base
177          *     @type array  $keys Keys for multidimensional array.
178          * }
179          */
180         final public function id_data() {
181                 return $this->id_data;
182         }
183
184         /**
185          * Set up the setting for aggregated multidimensional values.
186          *
187          * When a multidimensional setting gets aggregated, all of its preview and update
188          * calls get combined into one call, greatly improving performance.
189          *
190          * @since 4.4.0
191          * @access protected
192          */
193         protected function aggregate_multidimensional() {
194                 $id_base = $this->id_data['base'];
195                 if ( ! isset( self::$aggregated_multidimensionals[ $this->type ] ) ) {
196                         self::$aggregated_multidimensionals[ $this->type ] = array();
197                 }
198                 if ( ! isset( self::$aggregated_multidimensionals[ $this->type ][ $id_base ] ) ) {
199                         self::$aggregated_multidimensionals[ $this->type ][ $id_base ] = array(
200                                 'previewed_instances'       => array(), // Calling preview() will add the $setting to the array.
201                                 'preview_applied_instances' => array(), // Flags for which settings have had their values applied.
202                                 'root_value'                => $this->get_root_value( array() ), // Root value for initial state, manipulated by preview and update calls.
203                         );
204                 }
205
206                 if ( ! empty( $this->id_data['keys'] ) ) {
207                         // Note the preview-applied flag is cleared at priority 9 to ensure it is cleared before a deferred-preview runs.
208                         add_action( "customize_post_value_set_{$this->id}", array( $this, '_clear_aggregated_multidimensional_preview_applied_flag' ), 9 );
209                         $this->is_multidimensional_aggregated = true;
210                 }
211         }
212
213         /**
214          * Reset `$aggregated_multidimensionals` static variable.
215          *
216          * This is intended only for use by unit tests.
217          *
218          * @since 4.5.0
219          * @access public
220          * @ignore
221          */
222         static public function reset_aggregated_multidimensionals() {
223                 self::$aggregated_multidimensionals = array();
224         }
225
226         /**
227          * The ID for the current site when the preview() method was called.
228          *
229          * @since 4.2.0
230          * @access protected
231          * @var int
232          */
233         protected $_previewed_blog_id;
234
235         /**
236          * Return true if the current site is not the same as the previewed site.
237          *
238          * @since 4.2.0
239          * @access public
240          *
241          * @return bool If preview() has been called.
242          */
243         public function is_current_blog_previewed() {
244                 if ( ! isset( $this->_previewed_blog_id ) ) {
245                         return false;
246                 }
247                 return ( get_current_blog_id() === $this->_previewed_blog_id );
248         }
249
250         /**
251          * Original non-previewed value stored by the preview method.
252          *
253          * @see WP_Customize_Setting::preview()
254          * @since 4.1.1
255          * @var mixed
256          */
257         protected $_original_value;
258
259         /**
260          * Add filters to supply the setting's value when accessed.
261          *
262          * If the setting already has a pre-existing value and there is no incoming
263          * post value for the setting, then this method will short-circuit since
264          * there is no change to preview.
265          *
266          * @since 3.4.0
267          * @since 4.4.0 Added boolean return value.
268          * @access public
269          *
270          * @return bool False when preview short-circuits due no change needing to be previewed.
271          */
272         public function preview() {
273                 if ( ! isset( $this->_previewed_blog_id ) ) {
274                         $this->_previewed_blog_id = get_current_blog_id();
275                 }
276
277                 // Prevent re-previewing an already-previewed setting.
278                 if ( $this->is_previewed ) {
279                         return true;
280                 }
281
282                 $id_base = $this->id_data['base'];
283                 $is_multidimensional = ! empty( $this->id_data['keys'] );
284                 $multidimensional_filter = array( $this, '_multidimensional_preview_filter' );
285
286                 /*
287                  * Check if the setting has a pre-existing value (an isset check),
288                  * and if doesn't have any incoming post value. If both checks are true,
289                  * then the preview short-circuits because there is nothing that needs
290                  * to be previewed.
291                  */
292                 $undefined = new stdClass();
293                 $needs_preview = ( $undefined !== $this->post_value( $undefined ) );
294                 $value = null;
295
296                 // Since no post value was defined, check if we have an initial value set.
297                 if ( ! $needs_preview ) {
298                         if ( $this->is_multidimensional_aggregated ) {
299                                 $root = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
300                                 $value = $this->multidimensional_get( $root, $this->id_data['keys'], $undefined );
301                         } else {
302                                 $default = $this->default;
303                                 $this->default = $undefined; // Temporarily set default to undefined so we can detect if existing value is set.
304                                 $value = $this->value();
305                                 $this->default = $default;
306                         }
307                         $needs_preview = ( $undefined === $value ); // Because the default needs to be supplied.
308                 }
309
310                 // If the setting does not need previewing now, defer to when it has a value to preview.
311                 if ( ! $needs_preview ) {
312                         if ( ! has_action( "customize_post_value_set_{$this->id}", array( $this, 'preview' ) ) ) {
313                                 add_action( "customize_post_value_set_{$this->id}", array( $this, 'preview' ) );
314                         }
315                         return false;
316                 }
317
318                 switch ( $this->type ) {
319                         case 'theme_mod' :
320                                 if ( ! $is_multidimensional ) {
321                                         add_filter( "theme_mod_{$id_base}", array( $this, '_preview_filter' ) );
322                                 } else {
323                                         if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) {
324                                                 // Only add this filter once for this ID base.
325                                                 add_filter( "theme_mod_{$id_base}", $multidimensional_filter );
326                                         }
327                                         self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'][ $this->id ] = $this;
328                                 }
329                                 break;
330                         case 'option' :
331                                 if ( ! $is_multidimensional ) {
332                                         add_filter( "pre_option_{$id_base}", array( $this, '_preview_filter' ) );
333                                 } else {
334                                         if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) {
335                                                 // Only add these filters once for this ID base.
336                                                 add_filter( "option_{$id_base}", $multidimensional_filter );
337                                                 add_filter( "default_option_{$id_base}", $multidimensional_filter );
338                                         }
339                                         self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'][ $this->id ] = $this;
340                                 }
341                                 break;
342                         default :
343
344                                 /**
345                                  * Fires when the WP_Customize_Setting::preview() method is called for settings
346                                  * not handled as theme_mods or options.
347                                  *
348                                  * The dynamic portion of the hook name, `$this->id`, refers to the setting ID.
349                                  *
350                                  * @since 3.4.0
351                                  *
352                                  * @param WP_Customize_Setting $this WP_Customize_Setting instance.
353                                  */
354                                 do_action( "customize_preview_{$this->id}", $this );
355
356                                 /**
357                                  * Fires when the WP_Customize_Setting::preview() method is called for settings
358                                  * not handled as theme_mods or options.
359                                  *
360                                  * The dynamic portion of the hook name, `$this->type`, refers to the setting type.
361                                  *
362                                  * @since 4.1.0
363                                  *
364                                  * @param WP_Customize_Setting $this WP_Customize_Setting instance.
365                                  */
366                                 do_action( "customize_preview_{$this->type}", $this );
367                 }
368
369                 $this->is_previewed = true;
370
371                 return true;
372         }
373
374         /**
375          * Clear out the previewed-applied flag for a multidimensional-aggregated value whenever its post value is updated.
376          *
377          * This ensures that the new value will get sanitized and used the next time
378          * that `WP_Customize_Setting::_multidimensional_preview_filter()`
379          * is called for this setting.
380          *
381          * @since 4.4.0
382          * @access private
383          * @see WP_Customize_Manager::set_post_value()
384          * @see WP_Customize_Setting::_multidimensional_preview_filter()
385          */
386         final public function _clear_aggregated_multidimensional_preview_applied_flag() {
387                 unset( self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['preview_applied_instances'][ $this->id ] );
388         }
389
390         /**
391          * Callback function to filter non-multidimensional theme mods and options.
392          *
393          * If switch_to_blog() was called after the preview() method, and the current
394          * site is now not the same site, then this method does a no-op and returns
395          * the original value.
396          *
397          * @since 3.4.0
398          *
399          * @param mixed $original Old value.
400          * @return mixed New or old value.
401          */
402         public function _preview_filter( $original ) {
403                 if ( ! $this->is_current_blog_previewed() ) {
404                         return $original;
405                 }
406
407                 $undefined = new stdClass(); // Symbol hack.
408                 $post_value = $this->post_value( $undefined );
409                 if ( $undefined !== $post_value ) {
410                         $value = $post_value;
411                 } else {
412                         /*
413                          * Note that we don't use $original here because preview() will
414                          * not add the filter in the first place if it has an initial value
415                          * and there is no post value.
416                          */
417                         $value = $this->default;
418                 }
419                 return $value;
420         }
421
422         /**
423          * Callback function to filter multidimensional theme mods and options.
424          *
425          * For all multidimensional settings of a given type, the preview filter for
426          * the first setting previewed will be used to apply the values for the others.
427          *
428          * @since 4.4.0
429          * @access private
430          *
431          * @see WP_Customize_Setting::$aggregated_multidimensionals
432          * @param mixed $original Original root value.
433          * @return mixed New or old value.
434          */
435         final public function _multidimensional_preview_filter( $original ) {
436                 if ( ! $this->is_current_blog_previewed() ) {
437                         return $original;
438                 }
439
440                 $id_base = $this->id_data['base'];
441
442                 // If no settings have been previewed yet (which should not be the case, since $this is), just pass through the original value.
443                 if ( empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] ) ) {
444                         return $original;
445                 }
446
447                 foreach ( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['previewed_instances'] as $previewed_setting ) {
448                         // Skip applying previewed value for any settings that have already been applied.
449                         if ( ! empty( self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['preview_applied_instances'][ $previewed_setting->id ] ) ) {
450                                 continue;
451                         }
452
453                         // Do the replacements of the posted/default sub value into the root value.
454                         $value = $previewed_setting->post_value( $previewed_setting->default );
455                         $root = self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['root_value'];
456                         $root = $previewed_setting->multidimensional_replace( $root, $previewed_setting->id_data['keys'], $value );
457                         self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['root_value'] = $root;
458
459                         // Mark this setting having been applied so that it will be skipped when the filter is called again.
460                         self::$aggregated_multidimensionals[ $previewed_setting->type ][ $id_base ]['preview_applied_instances'][ $previewed_setting->id ] = true;
461                 }
462
463                 return self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
464         }
465
466         /**
467          * Checks user capabilities and theme supports, and then saves
468          * the value of the setting.
469          *
470          * @since 3.4.0
471          *
472          * @access public
473          *
474          * @return false|void False if cap check fails or value isn't set or is invalid.
475          */
476         final public function save() {
477                 $value = $this->post_value();
478
479                 if ( ! $this->check_capabilities() || ! isset( $value ) ) {
480                         return false;
481                 }
482
483                 /**
484                  * Fires when the WP_Customize_Setting::save() method is called.
485                  *
486                  * The dynamic portion of the hook name, `$this->id_data['base']` refers to
487                  * the base slug of the setting name.
488                  *
489                  * @since 3.4.0
490                  *
491                  * @param WP_Customize_Setting $this WP_Customize_Setting instance.
492                  */
493                 do_action( 'customize_save_' . $this->id_data['base'], $this );
494
495                 $this->update( $value );
496         }
497
498         /**
499          * Fetch and sanitize the $_POST value for the setting.
500          *
501          * During a save request prior to save, post_value() provides the new value while value() does not.
502          *
503          * @since 3.4.0
504          *
505          * @param mixed $default A default value which is used as a fallback. Default is null.
506          * @return mixed The default value on failure, otherwise the sanitized and validated value.
507          */
508         final public function post_value( $default = null ) {
509                 return $this->manager->post_value( $this, $default );
510         }
511
512         /**
513          * Sanitize an input.
514          *
515          * @since 3.4.0
516          *
517          * @param string|array $value    The value to sanitize.
518          * @return string|array|null|WP_Error Sanitized value, or `null`/`WP_Error` if invalid.
519          */
520         public function sanitize( $value ) {
521
522                 /**
523                  * Filters a Customize setting value in un-slashed form.
524                  *
525                  * @since 3.4.0
526                  *
527                  * @param mixed                $value Value of the setting.
528                  * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
529                  */
530                 return apply_filters( "customize_sanitize_{$this->id}", $value, $this );
531         }
532
533         /**
534          * Validates an input.
535          *
536          * @since 4.6.0
537          * @access public
538          *
539          * @see WP_REST_Request::has_valid_params()
540          *
541          * @param mixed $value Value to validate.
542          * @return true|WP_Error True if the input was validated, otherwise WP_Error.
543          */
544         public function validate( $value ) {
545                 if ( is_wp_error( $value ) ) {
546                         return $value;
547                 }
548                 if ( is_null( $value ) ) {
549                         return new WP_Error( 'invalid_value', __( 'Invalid value.' ) );
550                 }
551
552                 $validity = new WP_Error();
553
554                 /**
555                  * Validates a Customize setting value.
556                  *
557                  * Plugins should amend the `$validity` object via its `WP_Error::add()` method.
558                  *
559                  * The dynamic portion of the hook name, `$this->ID`, refers to the setting ID.
560                  *
561                  * @since 4.6.0
562                  *
563                  * @param WP_Error             $validity Filtered from `true` to `WP_Error` when invalid.
564                  * @param mixed                $value    Value of the setting.
565                  * @param WP_Customize_Setting $this     WP_Customize_Setting instance.
566                  */
567                 $validity = apply_filters( "customize_validate_{$this->id}", $validity, $value, $this );
568
569                 if ( is_wp_error( $validity ) && empty( $validity->errors ) ) {
570                         $validity = true;
571                 }
572                 return $validity;
573         }
574
575         /**
576          * Get the root value for a setting, especially for multidimensional ones.
577          *
578          * @since 4.4.0
579          * @access protected
580          *
581          * @param mixed $default Value to return if root does not exist.
582          * @return mixed
583          */
584         protected function get_root_value( $default = null ) {
585                 $id_base = $this->id_data['base'];
586                 if ( 'option' === $this->type ) {
587                         return get_option( $id_base, $default );
588                 } else if ( 'theme_mod' ) {
589                         return get_theme_mod( $id_base, $default );
590                 } else {
591                         /*
592                          * Any WP_Customize_Setting subclass implementing aggregate multidimensional
593                          * will need to override this method to obtain the data from the appropriate
594                          * location.
595                          */
596                         return $default;
597                 }
598         }
599
600         /**
601          * Set the root value for a setting, especially for multidimensional ones.
602          *
603          * @since 4.4.0
604          * @access protected
605          *
606          * @param mixed $value Value to set as root of multidimensional setting.
607          * @return bool Whether the multidimensional root was updated successfully.
608          */
609         protected function set_root_value( $value ) {
610                 $id_base = $this->id_data['base'];
611                 if ( 'option' === $this->type ) {
612                         $autoload = true;
613                         if ( isset( self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'] ) ) {
614                                 $autoload = self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'];
615                         }
616                         return update_option( $id_base, $value, $autoload );
617                 } else if ( 'theme_mod' ) {
618                         set_theme_mod( $id_base, $value );
619                         return true;
620                 } else {
621                         /*
622                          * Any WP_Customize_Setting subclass implementing aggregate multidimensional
623                          * will need to override this method to obtain the data from the appropriate
624                          * location.
625                          */
626                         return false;
627                 }
628         }
629
630         /**
631          * Save the value of the setting, using the related API.
632          *
633          * @since 3.4.0
634          *
635          * @param mixed $value The value to update.
636          * @return bool The result of saving the value.
637          */
638         protected function update( $value ) {
639                 $id_base = $this->id_data['base'];
640                 if ( 'option' === $this->type || 'theme_mod' === $this->type ) {
641                         if ( ! $this->is_multidimensional_aggregated ) {
642                                 return $this->set_root_value( $value );
643                         } else {
644                                 $root = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
645                                 $root = $this->multidimensional_replace( $root, $this->id_data['keys'], $value );
646                                 self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'] = $root;
647                                 return $this->set_root_value( $root );
648                         }
649                 } else {
650                         /**
651                          * Fires when the WP_Customize_Setting::update() method is called for settings
652                          * not handled as theme_mods or options.
653                          *
654                          * The dynamic portion of the hook name, `$this->type`, refers to the type of setting.
655                          *
656                          * @since 3.4.0
657                          *
658                          * @param mixed                $value Value of the setting.
659                          * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
660                          */
661                         do_action( "customize_update_{$this->type}", $value, $this );
662
663                         return has_action( "customize_update_{$this->type}" );
664                 }
665         }
666
667         /**
668          * Deprecated method.
669          *
670          * @since 3.4.0
671          * @deprecated 4.4.0 Deprecated in favor of update() method.
672          */
673         protected function _update_theme_mod() {
674                 _deprecated_function( __METHOD__, '4.4.0', __CLASS__ . '::update()' );
675         }
676
677         /**
678          * Deprecated method.
679          *
680          * @since 3.4.0
681          * @deprecated 4.4.0 Deprecated in favor of update() method.
682          */
683         protected function _update_option() {
684                 _deprecated_function( __METHOD__, '4.4.0', __CLASS__ . '::update()' );
685         }
686
687         /**
688          * Fetch the value of the setting.
689          *
690          * @since 3.4.0
691          *
692          * @return mixed The value.
693          */
694         public function value() {
695                 $id_base = $this->id_data['base'];
696                 $is_core_type = ( 'option' === $this->type || 'theme_mod' === $this->type );
697
698                 if ( ! $is_core_type && ! $this->is_multidimensional_aggregated ) {
699
700                         // Use post value if previewed and a post value is present.
701                         if ( $this->is_previewed ) {
702                                 $value = $this->post_value( null );
703                                 if ( null !== $value ) {
704                                         return $value;
705                                 }
706                         }
707
708                         $value = $this->get_root_value( $this->default );
709
710                         /**
711                          * Filters a Customize setting value not handled as a theme_mod or option.
712                          *
713                          * The dynamic portion of the hook name, `$id_base`, refers to
714                          * the base slug of the setting name, initialized from `$this->id_data['base']`.
715                          *
716                          * For settings handled as theme_mods or options, see those corresponding
717                          * functions for available hooks.
718                          *
719                          * @since 3.4.0
720                          * @since 4.6.0 Added the `$this` setting instance as the second parameter.
721                          *
722                          * @param mixed                $default The setting default value. Default empty.
723                          * @param WP_Customize_Setting $this    The setting instance.
724                          */
725                         $value = apply_filters( "customize_value_{$id_base}", $value, $this );
726                 } elseif ( $this->is_multidimensional_aggregated ) {
727                         $root_value = self::$aggregated_multidimensionals[ $this->type ][ $id_base ]['root_value'];
728                         $value = $this->multidimensional_get( $root_value, $this->id_data['keys'], $this->default );
729
730                         // Ensure that the post value is used if the setting is previewed, since preview filters aren't applying on cached $root_value.
731                         if ( $this->is_previewed ) {
732                                 $value = $this->post_value( $value );
733                         }
734                 } else {
735                         $value = $this->get_root_value( $this->default );
736                 }
737                 return $value;
738         }
739
740         /**
741          * Sanitize the setting's value for use in JavaScript.
742          *
743          * @since 3.4.0
744          *
745          * @return mixed The requested escaped value.
746          */
747         public function js_value() {
748
749                 /**
750                  * Filters a Customize setting value for use in JavaScript.
751                  *
752                  * The dynamic portion of the hook name, `$this->id`, refers to the setting ID.
753                  *
754                  * @since 3.4.0
755                  *
756                  * @param mixed                $value The setting value.
757                  * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
758                  */
759                 $value = apply_filters( "customize_sanitize_js_{$this->id}", $this->value(), $this );
760
761                 if ( is_string( $value ) )
762                         return html_entity_decode( $value, ENT_QUOTES, 'UTF-8');
763
764                 return $value;
765         }
766
767         /**
768          * Retrieves the data to export to the client via JSON.
769          *
770          * @since 4.6.0
771          * @access public
772          *
773          * @return array Array of parameters passed to JavaScript.
774          */
775         public function json() {
776                 return array(
777                         'value'     => $this->js_value(),
778                         'transport' => $this->transport,
779                         'dirty'     => $this->dirty,
780                         'type'      => $this->type,
781                 );
782         }
783
784         /**
785          * Validate user capabilities whether the theme supports the setting.
786          *
787          * @since 3.4.0
788          *
789          * @return bool False if theme doesn't support the setting or user can't change setting, otherwise true.
790          */
791         final public function check_capabilities() {
792                 if ( $this->capability && ! call_user_func_array( 'current_user_can', (array) $this->capability ) )
793                         return false;
794
795                 if ( $this->theme_supports && ! call_user_func_array( 'current_theme_supports', (array) $this->theme_supports ) )
796                         return false;
797
798                 return true;
799         }
800
801         /**
802          * Multidimensional helper function.
803          *
804          * @since 3.4.0
805          *
806          * @param $root
807          * @param $keys
808          * @param bool $create Default is false.
809          * @return array|void Keys are 'root', 'node', and 'key'.
810          */
811         final protected function multidimensional( &$root, $keys, $create = false ) {
812                 if ( $create && empty( $root ) )
813                         $root = array();
814
815                 if ( ! isset( $root ) || empty( $keys ) )
816                         return;
817
818                 $last = array_pop( $keys );
819                 $node = &$root;
820
821                 foreach ( $keys as $key ) {
822                         if ( $create && ! isset( $node[ $key ] ) )
823                                 $node[ $key ] = array();
824
825                         if ( ! is_array( $node ) || ! isset( $node[ $key ] ) )
826                                 return;
827
828                         $node = &$node[ $key ];
829                 }
830
831                 if ( $create ) {
832                         if ( ! is_array( $node ) ) {
833                                 // account for an array overriding a string or object value
834                                 $node = array();
835                         }
836                         if ( ! isset( $node[ $last ] ) ) {
837                                 $node[ $last ] = array();
838                         }
839                 }
840
841                 if ( ! isset( $node[ $last ] ) )
842                         return;
843
844                 return array(
845                         'root' => &$root,
846                         'node' => &$node,
847                         'key'  => $last,
848                 );
849         }
850
851         /**
852          * Will attempt to replace a specific value in a multidimensional array.
853          *
854          * @since 3.4.0
855          *
856          * @param $root
857          * @param $keys
858          * @param mixed $value The value to update.
859          * @return mixed
860          */
861         final protected function multidimensional_replace( $root, $keys, $value ) {
862                 if ( ! isset( $value ) )
863                         return $root;
864                 elseif ( empty( $keys ) ) // If there are no keys, we're replacing the root.
865                         return $value;
866
867                 $result = $this->multidimensional( $root, $keys, true );
868
869                 if ( isset( $result ) )
870                         $result['node'][ $result['key'] ] = $value;
871
872                 return $root;
873         }
874
875         /**
876          * Will attempt to fetch a specific value from a multidimensional array.
877          *
878          * @since 3.4.0
879          *
880          * @param $root
881          * @param $keys
882          * @param mixed $default A default value which is used as a fallback. Default is null.
883          * @return mixed The requested value or the default value.
884          */
885         final protected function multidimensional_get( $root, $keys, $default = null ) {
886                 if ( empty( $keys ) ) // If there are no keys, test the root.
887                         return isset( $root ) ? $root : $default;
888
889                 $result = $this->multidimensional( $root, $keys );
890                 return isset( $result ) ? $result['node'][ $result['key'] ] : $default;
891         }
892
893         /**
894          * Will attempt to check if a specific value in a multidimensional array is set.
895          *
896          * @since 3.4.0
897          *
898          * @param $root
899          * @param $keys
900          * @return bool True if value is set, false if not.
901          */
902         final protected function multidimensional_isset( $root, $keys ) {
903                 $result = $this->multidimensional_get( $root, $keys );
904                 return isset( $result );
905         }
906 }
907
908 /** WP_Customize_Filter_Setting class */
909 require_once( ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php' );
910
911 /** WP_Customize_Header_Image_Setting class */
912 require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php' );
913
914 /** WP_Customize_Background_Image_Setting class */
915 require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php' );
916
917 /** WP_Customize_Nav_Menu_Item_Setting class */
918 require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php' );
919
920 /** WP_Customize_Nav_Menu_Setting class */
921 require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php' );