wp-admin/includes/update-core.php

   1 <?php
   2 /**
   3  * WordPress core upgrade functionality.
   4  *
   5  * @package WordPress
   6  * @subpackage Administration
   7  * @since 2.7.0
   8  */
   9
  10 /**
  11  * Stores files to be deleted.
  12  *
  13  * @since 2.7.0
  14  * @global array $_old_files
  15  * @var array
  16  * @name $_old_files
  17  */
  18 global $_old_files;
  19
  20 $_old_files = array(
  21 // 2.0
  22 'wp-admin/import-b2.php',
  23 'wp-admin/import-blogger.php',
  24 'wp-admin/import-greymatter.php',
  25 'wp-admin/import-livejournal.php',
  26 'wp-admin/import-mt.php',
  27 'wp-admin/import-rss.php',
  28 'wp-admin/import-textpattern.php',
  29 'wp-admin/quicktags.js',
  30 'wp-images/fade-butt.png',
  31 'wp-images/get-firefox.png',
  32 'wp-images/header-shadow.png',
  33 'wp-images/smilies',
  34 'wp-images/wp-small.png',
  35 'wp-images/wpminilogo.png',
  36 'wp.php',
  37 // 2.0.8
  38 'wp-includes/js/tinymce/plugins/inlinepopups/readme.txt',
  39 // 2.1
  40 'wp-admin/edit-form-ajax-cat.php',
  41 'wp-admin/execute-pings.php',
  42 'wp-admin/inline-uploading.php',
  43 'wp-admin/link-categories.php',
  44 'wp-admin/list-manipulation.js',
  45 'wp-admin/list-manipulation.php',
  46 'wp-includes/comment-functions.php',
  47 'wp-includes/feed-functions.php',
  48 'wp-includes/functions-compat.php',
  49 'wp-includes/functions-formatting.php',
  50 'wp-includes/functions-post.php',
  51 'wp-includes/js/dbx-key.js',
  52 'wp-includes/js/tinymce/plugins/autosave/langs/cs.js',
  53 'wp-includes/js/tinymce/plugins/autosave/langs/sv.js',
  54 'wp-includes/links.php',
  55 'wp-includes/pluggable-functions.php',
  56 'wp-includes/template-functions-author.php',
  57 'wp-includes/template-functions-category.php',
  58 'wp-includes/template-functions-general.php',
  59 'wp-includes/template-functions-links.php',
  60 'wp-includes/template-functions-post.php',
  61 'wp-includes/wp-l10n.php',
  62 // 2.2
  63 'wp-admin/cat-js.php',
  64 'wp-admin/import/b2.php',
  65 'wp-includes/js/autosave-js.php',
  66 'wp-includes/js/list-manipulation-js.php',
  67 'wp-includes/js/wp-ajax-js.php',
  68 // 2.3
  69 'wp-admin/admin-db.php',
  70 'wp-admin/cat.js',
  71 'wp-admin/categories.js',
  72 'wp-admin/custom-fields.js',
  73 'wp-admin/dbx-admin-key.js',
  74 'wp-admin/edit-comments.js',
  75 'wp-admin/install-rtl.css',
  76 'wp-admin/install.css',
  77 'wp-admin/upgrade-schema.php',
  78 'wp-admin/upload-functions.php',
  79 'wp-admin/upload-rtl.css',
  80 'wp-admin/upload.css',
  81 'wp-admin/upload.js',
  82 'wp-admin/users.js',
  83 'wp-admin/widgets-rtl.css',
  84 'wp-admin/widgets.css',
  85 'wp-admin/xfn.js',
  86 'wp-includes/js/tinymce/license.html',
  87 // 2.5
  88 'wp-admin/css/upload.css',
  89 'wp-admin/images/box-bg-left.gif',
  90 'wp-admin/images/box-bg-right.gif',
  91 'wp-admin/images/box-bg.gif',
  92 'wp-admin/images/box-butt-left.gif',
  93 'wp-admin/images/box-butt-right.gif',
  94 'wp-admin/images/box-butt.gif',
  95 'wp-admin/images/box-head-left.gif',
  96 'wp-admin/images/box-head-right.gif',
  97 'wp-admin/images/box-head.gif',
  98 'wp-admin/images/heading-bg.gif',
  99 'wp-admin/images/login-bkg-bottom.gif',
 100 'wp-admin/images/login-bkg-tile.gif',
 101 'wp-admin/images/notice.gif',
 102 'wp-admin/images/toggle.gif',
 103 'wp-admin/includes/upload.php',
 104 'wp-admin/js/dbx-admin-key.js',
 105 'wp-admin/js/link-cat.js',
 106 'wp-admin/profile-update.php',
 107 'wp-admin/templates.php',
 108 'wp-includes/images/wlw/WpComments.png',
 109 'wp-includes/images/wlw/WpIcon.png',
 110 'wp-includes/images/wlw/WpWatermark.png',
 111 'wp-includes/js/dbx.js',
 112 'wp-includes/js/fat.js',
 113 'wp-includes/js/list-manipulation.js',
 114 'wp-includes/js/tinymce/langs/en.js',
 115 'wp-includes/js/tinymce/plugins/autosave/editor_plugin_src.js',
 116 'wp-includes/js/tinymce/plugins/autosave/langs',
 117 'wp-includes/js/tinymce/plugins/directionality/images',
 118 'wp-includes/js/tinymce/plugins/directionality/langs',
 119 'wp-includes/js/tinymce/plugins/inlinepopups/css',
 120 'wp-includes/js/tinymce/plugins/inlinepopups/images',
 121 'wp-includes/js/tinymce/plugins/inlinepopups/jscripts',
 122 'wp-includes/js/tinymce/plugins/paste/images',
 123 'wp-includes/js/tinymce/plugins/paste/jscripts',
 124 'wp-includes/js/tinymce/plugins/paste/langs',
 125 'wp-includes/js/tinymce/plugins/spellchecker/classes/HttpClient.class.php',
 126 'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyGoogleSpell.class.php',
 127 'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspell.class.php',
 128 'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspellShell.class.php',
 129 'wp-includes/js/tinymce/plugins/spellchecker/css/spellchecker.css',
 130 'wp-includes/js/tinymce/plugins/spellchecker/images',
 131 'wp-includes/js/tinymce/plugins/spellchecker/langs',
 132 'wp-includes/js/tinymce/plugins/spellchecker/tinyspell.php',
 133 'wp-includes/js/tinymce/plugins/wordpress/images',
 134 'wp-includes/js/tinymce/plugins/wordpress/langs',
 135 'wp-includes/js/tinymce/plugins/wordpress/wordpress.css',
 136 'wp-includes/js/tinymce/plugins/wphelp',
 137 'wp-includes/js/tinymce/themes/advanced/css',
 138 'wp-includes/js/tinymce/themes/advanced/images',
 139 'wp-includes/js/tinymce/themes/advanced/jscripts',
 140 'wp-includes/js/tinymce/themes/advanced/langs',
 141 // 2.5.1
 142 'wp-includes/js/tinymce/tiny_mce_gzip.php',
 143 // 2.6
 144 'wp-admin/bookmarklet.php',
 145 'wp-includes/js/jquery/jquery.dimensions.min.js',
 146 'wp-includes/js/tinymce/plugins/wordpress/popups.css',
 147 'wp-includes/js/wp-ajax.js',
 148 // 2.7
 149 'wp-admin/css/press-this-ie-rtl.css',
 150 'wp-admin/css/press-this-ie.css',
 151 'wp-admin/css/upload-rtl.css',
 152 'wp-admin/edit-form.php',
 153 'wp-admin/images/comment-pill.gif',
 154 'wp-admin/images/comment-stalk-classic.gif',
 155 'wp-admin/images/comment-stalk-fresh.gif',
 156 'wp-admin/images/comment-stalk-rtl.gif',
 157 'wp-admin/images/del.png',
 158 'wp-admin/images/gear.png',
 159 'wp-admin/images/media-button-gallery.gif',
 160 'wp-admin/images/media-buttons.gif',
 161 'wp-admin/images/postbox-bg.gif',
 162 'wp-admin/images/tab.png',
 163 'wp-admin/images/tail.gif',
 164 'wp-admin/js/forms.js',
 165 'wp-admin/js/upload.js',
 166 'wp-admin/link-import.php',
 167 'wp-includes/images/audio.png',
 168 'wp-includes/images/css.png',
 169 'wp-includes/images/default.png',
 170 'wp-includes/images/doc.png',
 171 'wp-includes/images/exe.png',
 172 'wp-includes/images/html.png',
 173 'wp-includes/images/js.png',
 174 'wp-includes/images/pdf.png',
 175 'wp-includes/images/swf.png',
 176 'wp-includes/images/tar.png',
 177 'wp-includes/images/text.png',
 178 'wp-includes/images/video.png',
 179 'wp-includes/images/zip.png',
 180 'wp-includes/js/tinymce/tiny_mce_config.php',
 181 'wp-includes/js/tinymce/tiny_mce_ext.js',
 182 // 2.8
 183 'wp-admin/js/users.js',
 184 'wp-includes/js/swfupload/plugins/swfupload.documentready.js',
 185 'wp-includes/js/swfupload/plugins/swfupload.graceful_degradation.js',
 186 'wp-includes/js/swfupload/swfupload_f9.swf',
 187 'wp-includes/js/tinymce/plugins/autosave',
 188 'wp-includes/js/tinymce/plugins/paste/css',
 189 'wp-includes/js/tinymce/utils/mclayer.js',
 190 'wp-includes/js/tinymce/wordpress.css',
 191 // 2.8.5
 192 'wp-admin/import/btt.php',
 193 'wp-admin/import/jkw.php',
 194 // 2.9
 195 'wp-admin/js/page.dev.js',
 196 'wp-admin/js/page.js',
 197 'wp-admin/js/set-post-thumbnail-handler.dev.js',
 198 'wp-admin/js/set-post-thumbnail-handler.js',
 199 'wp-admin/js/slug.dev.js',
 200 'wp-admin/js/slug.js',
 201 'wp-includes/gettext.php',
 202 'wp-includes/js/tinymce/plugins/wordpress/js',
 203 'wp-includes/streams.php',
 204 // MU
 205 'README.txt',
 206 'htaccess.dist',
 207 'index-install.php',
 208 'wp-admin/css/mu-rtl.css',
 209 'wp-admin/css/mu.css',
 210 'wp-admin/images/site-admin.png',
 211 'wp-admin/includes/mu.php',
 212 'wp-admin/wpmu-admin.php',
 213 'wp-admin/wpmu-blogs.php',
 214 'wp-admin/wpmu-edit.php',
 215 'wp-admin/wpmu-options.php',
 216 'wp-admin/wpmu-themes.php',
 217 'wp-admin/wpmu-upgrade-site.php',
 218 'wp-admin/wpmu-users.php',
 219 'wp-includes/images/wordpress-mu.png',
 220 'wp-includes/wpmu-default-filters.php',
 221 'wp-includes/wpmu-functions.php',
 222 'wpmu-settings.php',
 223 // 3.0
 224 'wp-admin/categories.php',
 225 'wp-admin/edit-category-form.php',
 226 'wp-admin/edit-page-form.php',
 227 'wp-admin/edit-pages.php',
 228 'wp-admin/images/admin-header-footer.png',
 229 'wp-admin/images/browse-happy.gif',
 230 'wp-admin/images/ico-add.png',
 231 'wp-admin/images/ico-close.png',
 232 'wp-admin/images/ico-edit.png',
 233 'wp-admin/images/ico-viewpage.png',
 234 'wp-admin/images/fav-top.png',
 235 'wp-admin/images/screen-options-left.gif',
 236 'wp-admin/images/wp-logo-vs.gif',
 237 'wp-admin/images/wp-logo.gif',
 238 'wp-admin/import',
 239 'wp-admin/js/wp-gears.dev.js',
 240 'wp-admin/js/wp-gears.js',
 241 'wp-admin/options-misc.php',
 242 'wp-admin/page-new.php',
 243 'wp-admin/page.php',
 244 'wp-admin/rtl.css',
 245 'wp-admin/rtl.dev.css',
 246 'wp-admin/update-links.php',
 247 'wp-admin/wp-admin.css',
 248 'wp-admin/wp-admin.dev.css',
 249 'wp-includes/js/codepress',
 250 'wp-includes/js/codepress/engines/khtml.js',
 251 'wp-includes/js/codepress/engines/older.js',
 252 'wp-includes/js/jquery/autocomplete.dev.js',
 253 'wp-includes/js/jquery/autocomplete.js',
 254 'wp-includes/js/jquery/interface.js',
 255 'wp-includes/js/scriptaculous/prototype.js',
 256 'wp-includes/js/tinymce/wp-tinymce.js',
 257 // 3.1
 258 'wp-admin/edit-attachment-rows.php',
 259 'wp-admin/edit-link-categories.php',
 260 'wp-admin/edit-link-category-form.php',
 261 'wp-admin/edit-post-rows.php',
 262 'wp-admin/images/button-grad-active-vs.png',
 263 'wp-admin/images/button-grad-vs.png',
 264 'wp-admin/images/fav-arrow-vs-rtl.gif',
 265 'wp-admin/images/fav-arrow-vs.gif',
 266 'wp-admin/images/fav-top-vs.gif',
 267 'wp-admin/images/list-vs.png',
 268 'wp-admin/images/screen-options-right-up.gif',
 269 'wp-admin/images/screen-options-right.gif',
 270 'wp-admin/images/visit-site-button-grad-vs.gif',
 271 'wp-admin/images/visit-site-button-grad.gif',
 272 'wp-admin/link-category.php',
 273 'wp-admin/sidebar.php',
 274 'wp-includes/classes.php',
 275 'wp-includes/js/tinymce/blank.htm',
 276 'wp-includes/js/tinymce/plugins/media/css/content.css',
 277 'wp-includes/js/tinymce/plugins/media/img',
 278 'wp-includes/js/tinymce/plugins/safari',
 279 // 3.2
 280 'wp-admin/images/logo-login.gif',
 281 'wp-admin/images/star.gif',
 282 'wp-admin/js/list-table.dev.js',
 283 'wp-admin/js/list-table.js',
 284 'wp-includes/default-embeds.php',
 285 'wp-includes/js/tinymce/plugins/wordpress/img/help.gif',
 286 'wp-includes/js/tinymce/plugins/wordpress/img/more.gif',
 287 'wp-includes/js/tinymce/plugins/wordpress/img/toolbars.gif',
 288 'wp-includes/js/tinymce/themes/advanced/img/fm.gif',
 289 'wp-includes/js/tinymce/themes/advanced/img/sflogo.png',
 290 // 3.3
 291 'wp-admin/css/colors-classic-rtl.css',
 292 'wp-admin/css/colors-classic-rtl.dev.css',
 293 'wp-admin/css/colors-fresh-rtl.css',
 294 'wp-admin/css/colors-fresh-rtl.dev.css',
 295 'wp-admin/css/dashboard-rtl.css',
 296 'wp-admin/css/dashboard-rtl.dev.css',
 297 'wp-admin/css/dashboard.css',
 298 'wp-admin/css/dashboard.dev.css',
 299 'wp-admin/css/farbtastic-rtl.css',
 300 'wp-admin/css/global-rtl.css',
 301 'wp-admin/css/global-rtl.dev.css',
 302 'wp-admin/css/global.css',
 303 'wp-admin/css/global.dev.css',
 304 'wp-admin/css/install-rtl.css',
 305 'wp-admin/css/install-rtl.dev.css',
 306 'wp-admin/css/login-rtl.css',
 307 'wp-admin/css/login-rtl.dev.css',
 308 'wp-admin/css/login.css',
 309 'wp-admin/css/login.dev.css',
 310 'wp-admin/css/ms.css',
 311 'wp-admin/css/ms.dev.css',
 312 'wp-admin/css/nav-menu-rtl.css',
 313 'wp-admin/css/nav-menu-rtl.dev.css',
 314 'wp-admin/css/nav-menu.css',
 315 'wp-admin/css/nav-menu.dev.css',
 316 'wp-admin/css/plugin-install-rtl.css',
 317 'wp-admin/css/plugin-install-rtl.dev.css',
 318 'wp-admin/css/plugin-install.css',
 319 'wp-admin/css/plugin-install.dev.css',
 320 'wp-admin/css/press-this-rtl.css',
 321 'wp-admin/css/press-this-rtl.dev.css',
 322 'wp-admin/css/press-this.css',
 323 'wp-admin/css/press-this.dev.css',
 324 'wp-admin/css/theme-editor-rtl.css',
 325 'wp-admin/css/theme-editor-rtl.dev.css',
 326 'wp-admin/css/theme-editor.css',
 327 'wp-admin/css/theme-editor.dev.css',
 328 'wp-admin/css/theme-install-rtl.css',
 329 'wp-admin/css/theme-install-rtl.dev.css',
 330 'wp-admin/css/theme-install.css',
 331 'wp-admin/css/theme-install.dev.css',
 332 'wp-admin/css/widgets-rtl.css',
 333 'wp-admin/css/widgets-rtl.dev.css',
 334 'wp-admin/css/widgets.css',
 335 'wp-admin/css/widgets.dev.css',
 336 'wp-admin/includes/internal-linking.php',
 337 'wp-includes/images/admin-bar-sprite-rtl.png',
 338 'wp-includes/js/jquery/ui.button.js',
 339 'wp-includes/js/jquery/ui.core.js',
 340 'wp-includes/js/jquery/ui.dialog.js',
 341 'wp-includes/js/jquery/ui.draggable.js',
 342 'wp-includes/js/jquery/ui.droppable.js',
 343 'wp-includes/js/jquery/ui.mouse.js',
 344 'wp-includes/js/jquery/ui.position.js',
 345 'wp-includes/js/jquery/ui.resizable.js',
 346 'wp-includes/js/jquery/ui.selectable.js',
 347 'wp-includes/js/jquery/ui.sortable.js',
 348 'wp-includes/js/jquery/ui.tabs.js',
 349 'wp-includes/js/jquery/ui.widget.js',
 350 'wp-includes/js/l10n.dev.js',
 351 'wp-includes/js/l10n.js',
 352 'wp-includes/js/tinymce/plugins/wplink/css',
 353 'wp-includes/js/tinymce/plugins/wplink/img',
 354 'wp-includes/js/tinymce/plugins/wplink/js',
 355 'wp-includes/js/tinymce/themes/advanced/img/wpicons.png',
 356 'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/butt2.png',
 357 'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/button_bg.png',
 358 'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/down_arrow.gif',
 359 'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/fade-butt.png',
 360 'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/separator.gif',
 361 // Don't delete, yet: 'wp-rss.php',
 362 // Don't delete, yet: 'wp-rdf.php',
 363 // Don't delete, yet: 'wp-rss2.php',
 364 // Don't delete, yet: 'wp-commentsrss2.php',
 365 // Don't delete, yet: 'wp-atom.php',
 366 // Don't delete, yet: 'wp-feed.php',
 367 // 3.4
 368 'wp-admin/images/gray-star.png',
 369 'wp-admin/images/logo-login.png',
 370 'wp-admin/images/star.png',
 371 'wp-admin/index-extra.php',
 372 'wp-admin/network/index-extra.php',
 373 'wp-admin/user/index-extra.php',
 374 'wp-admin/images/screenshots/admin-flyouts.png',
 375 'wp-admin/images/screenshots/coediting.png',
 376 'wp-admin/images/screenshots/drag-and-drop.png',
 377 'wp-admin/images/screenshots/help-screen.png',
 378 'wp-admin/images/screenshots/media-icon.png',
 379 'wp-admin/images/screenshots/new-feature-pointer.png',
 380 'wp-admin/images/screenshots/welcome-screen.png',
 381 'wp-includes/css/editor-buttons.css',
 382 'wp-includes/css/editor-buttons.dev.css',
 383 'wp-includes/js/tinymce/plugins/paste/blank.htm',
 384 'wp-includes/js/tinymce/plugins/wordpress/css',
 385 'wp-includes/js/tinymce/plugins/wordpress/editor_plugin.dev.js',
 386 'wp-includes/js/tinymce/plugins/wordpress/img/embedded.png',
 387 'wp-includes/js/tinymce/plugins/wordpress/img/more_bug.gif',
 388 'wp-includes/js/tinymce/plugins/wordpress/img/page_bug.gif',
 389 'wp-includes/js/tinymce/plugins/wpdialogs/editor_plugin.dev.js',
 390 'wp-includes/js/tinymce/plugins/wpeditimage/css/editimage-rtl.css',
 391 'wp-includes/js/tinymce/plugins/wpeditimage/editor_plugin.dev.js',
 392 'wp-includes/js/tinymce/plugins/wpfullscreen/editor_plugin.dev.js',
 393 'wp-includes/js/tinymce/plugins/wpgallery/editor_plugin.dev.js',
 394 'wp-includes/js/tinymce/plugins/wpgallery/img/gallery.png',
 395 'wp-includes/js/tinymce/plugins/wplink/editor_plugin.dev.js',
 396 // Don't delete, yet: 'wp-pass.php',
 397 // Don't delete, yet: 'wp-register.php',
 398 );
 399
 400 /**
 401  * Stores new files in wp-content to copy
 402  *
 403  * The contents of this array indicate any new bundled plugins/themes which
 404  * should be installed with the WordPress Upgrade. These items will not be
 405  * re-installed in future upgrades, this behaviour is controlled by the
 406  * introduced version present here being older than the current installed version.
 407  *
 408  * The content of this array should follow the following format:
 409  * Filename (relative to wp-content) => Introduced version
 410  * Directories should be noted by suffixing it with a trailing slash (/)
 411  *
 412  * @since 3.2.0
 413  * @global array $_new_bundled_files
 414  * @var array
 415  * @name $_new_bundled_files
 416  */
 417 global $_new_bundled_files;
 418
 419 $_new_bundled_files = array(
 420 'plugins/akismet/' => '2.0',
 421 'themes/twentyten/' => '3.0',
 422 'themes/twentyeleven/' => '3.2'
 423 );
 424
 425 /**
 426  * Upgrade the core of WordPress.
 427  *
 428  * This will create a .maintenance file at the base of the WordPress directory
 429  * to ensure that people can not access the web site, when the files are being
 430  * copied to their locations.
 431  *
 432  * The files in the {@link $_old_files} list will be removed and the new files
 433  * copied from the zip file after the database is upgraded.
 434  *
 435  * The files in the {@link $_new_bundled_files} list will be added to the installation
 436  * if the version is greater than or equal to the old version being upgraded.
 437  *
 438  * The steps for the upgrader for after the new release is downloaded and
 439  * unzipped is:
 440  *   1. Test unzipped location for select files to ensure that unzipped worked.
 441  *   2. Create the .maintenance file in current WordPress base.
 442  *   3. Copy new WordPress directory over old WordPress files.
 443  *   4. Upgrade WordPress to new version.
 444  *     4.1. Copy all files/folders other than wp-content
 445  *     4.2. Copy any language files to WP_LANG_DIR (which may differ from WP_CONTENT_DIR
 446  *     4.3. Copy any new bundled themes/plugins to their respective locations
 447  *   5. Delete new WordPress directory path.
 448  *   6. Delete .maintenance file.
 449  *   7. Remove old files.
 450  *   8. Delete 'update_core' option.
 451  *
 452  * There are several areas of failure. For instance if PHP times out before step
 453  * 6, then you will not be able to access any portion of your site. Also, since
 454  * the upgrade will not continue where it left off, you will not be able to
 455  * automatically remove old files and remove the 'update_core' option. This
 456  * isn't that bad.
 457  *
 458  * If the copy of the new WordPress over the old fails, then the worse is that
 459  * the new WordPress directory will remain.
 460  *
 461  * If it is assumed that every file will be copied over, including plugins and
 462  * themes, then if you edit the default theme, you should rename it, so that
 463  * your changes remain.
 464  *
 465  * @since 2.7.0
 466  *
 467  * @param string $from New release unzipped path.
 468  * @param string $to Path to old WordPress installation.
 469  * @return WP_Error|null WP_Error on failure, null on success.
 470  */
 471 function update_core($from, $to) {
 472         global $wp_filesystem, $_old_files, $_new_bundled_files, $wpdb;
 473
 474         @set_time_limit( 300 );
 475
 476         $php_version    = phpversion();
 477         $mysql_version  = $wpdb->db_version();
 478         $required_php_version = '5.2.4';
 479         $required_mysql_version = '5.0';
 480         $wp_version = '3.4.2';
 481         $php_compat     = version_compare( $php_version, $required_php_version, '>=' );
 482         if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) )
 483                 $mysql_compat = true;
 484         else
 485                 $mysql_compat = version_compare( $mysql_version, $required_mysql_version, '>=' );
 486
 487         if ( !$mysql_compat || !$php_compat )
 488                 $wp_filesystem->delete($from, true);
 489
 490         if ( !$mysql_compat && !$php_compat )
 491                 return new WP_Error( 'php_mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.'), $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version ) );
 492         elseif ( !$php_compat )
 493                 return new WP_Error( 'php_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher. You are running version %3$s.'), $wp_version, $required_php_version, $php_version ) );
 494         elseif ( !$mysql_compat )
 495                 return new WP_Error( 'mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires MySQL version %2$s or higher. You are running version %3$s.'), $wp_version, $required_mysql_version, $mysql_version ) );
 496
 497         // Sanity check the unzipped distribution
 498         apply_filters('update_feedback', __('Verifying the unpacked files&#8230;'));
 499         $distro = '';
 500         $roots = array( '/wordpress/', '/wordpress-mu/' );
 501         foreach( $roots as $root ) {
 502                 if ( $wp_filesystem->exists($from . $root . 'readme.html') && $wp_filesystem->exists($from . $root . 'wp-includes/version.php') ) {
 503                         $distro = $root;
 504                         break;
 505                 }
 506         }
 507         if ( !$distro ) {
 508                 $wp_filesystem->delete($from, true);
 509                 return new WP_Error('insane_distro', __('The update could not be unpacked') );
 510         }
 511
 512         apply_filters('update_feedback', __('Installing the latest version&#8230;'));
 513
 514         // Create maintenance file to signal that we are upgrading
 515         $maintenance_string = '<?php $upgrading = ' . time() . '; ?>';
 516         $maintenance_file = $to . '.maintenance';
 517         $wp_filesystem->delete($maintenance_file);
 518         $wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE);
 519
 520         // Copy new versions of WP files into place.
 521         $result = _copy_dir($from . $distro, $to, array('wp-content') );
 522
 523         // Custom Content Directory needs updating now.
 524         // Copy Languages
 525         if ( !is_wp_error($result) && $wp_filesystem->is_dir($from . $distro . 'wp-content/languages') ) {
 526                 if ( WP_LANG_DIR != ABSPATH . WPINC . '/languages' || @is_dir(WP_LANG_DIR) )
 527                         $lang_dir = WP_LANG_DIR;
 528                 else
 529                         $lang_dir = WP_CONTENT_DIR . '/languages';
 530
 531                 if ( !@is_dir($lang_dir) && 0 === strpos($lang_dir, ABSPATH) ) { // Check the language directory exists first
 532                         $wp_filesystem->mkdir($to . str_replace(ABSPATH, '', $lang_dir), FS_CHMOD_DIR); // If it's within the ABSPATH we can handle it here, otherwise they're out of luck.
 533                         clearstatcache(); // for FTP, Need to clear the stat cache
 534                 }
 535
 536                 if ( @is_dir($lang_dir) ) {
 537                         $wp_lang_dir = $wp_filesystem->find_folder($lang_dir);
 538                         if ( $wp_lang_dir )
 539                                 $result = copy_dir($from . $distro . 'wp-content/languages/', $wp_lang_dir);
 540                 }
 541         }
 542
 543         // Copy New bundled plugins & themes
 544         // This gives us the ability to install new plugins & themes bundled with future versions of WordPress whilst avoiding the re-install upon upgrade issue.
 545         if ( !is_wp_error($result) && ( ! defined('CORE_UPGRADE_SKIP_NEW_BUNDLED') || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
 546                 $old_version = $GLOBALS['wp_version']; // $wp_version in local scope == new version
 547                 foreach ( (array) $_new_bundled_files as $file => $introduced_version ) {
 548                         // If $introduced version is greater than what the site was previously running
 549                         if ( version_compare($introduced_version, $old_version, '>') ) {
 550                                 $directory = ('/' == $file[ strlen($file)-1 ]);
 551                                 list($type, $filename) = explode('/', $file, 2);
 552
 553                                 if ( 'plugins' == $type )
 554                                         $dest = $wp_filesystem->wp_plugins_dir();
 555                                 elseif ( 'themes' == $type )
 556                                         $dest = trailingslashit($wp_filesystem->wp_themes_dir()); // Back-compat, ::wp_themes_dir() did not return trailingslash'd pre-3.2
 557                                 else
 558                                         continue;
 559
 560                                 if ( ! $directory ) {
 561                                         if ( $wp_filesystem->exists($dest . $filename) )
 562                                                 continue;
 563
 564                                         if ( ! $wp_filesystem->copy($from . $distro . 'wp-content/' . $file, $dest . $filename, FS_CHMOD_FILE) )
 565                                                 $result = new WP_Error('copy_failed', __('Could not copy file.'), $dest . $filename);
 566                                 } else {
 567                                         if ( $wp_filesystem->is_dir($dest . $filename) )
 568                                                 continue;
 569
 570                                         $wp_filesystem->mkdir($dest . $filename, FS_CHMOD_DIR);
 571                                         $_result = copy_dir( $from . $distro . 'wp-content/' . $file, $dest . $filename);
 572                                         if ( is_wp_error($_result) ) //If a error occurs partway through this final step, keep the error flowing through, but keep process going.
 573                                                 $result = $_result;
 574                                 }
 575                         }
 576                 } //end foreach
 577         }
 578
 579         // Handle $result error from the above blocks
 580         if ( is_wp_error($result) ) {
 581                 $wp_filesystem->delete($maintenance_file);
 582                 $wp_filesystem->delete($from, true);
 583                 return $result;
 584         }
 585
 586         // Remove old files
 587         foreach ( $_old_files as $old_file ) {
 588                 $old_file = $to . $old_file;
 589                 if ( !$wp_filesystem->exists($old_file) )
 590                         continue;
 591                 $wp_filesystem->delete($old_file, true);
 592         }
 593
 594         // Upgrade DB with separate request
 595         apply_filters('update_feedback', __('Upgrading database&#8230;'));
 596         $db_upgrade_url = admin_url('upgrade.php?step=upgrade_db');
 597         wp_remote_post($db_upgrade_url, array('timeout' => 60));
 598
 599         // Remove working directory
 600         $wp_filesystem->delete($from, true);
 601
 602         // Force refresh of update information
 603         if ( function_exists('delete_site_transient') )
 604                 delete_site_transient('update_core');
 605         else
 606                 delete_option('update_core');
 607
 608         // Remove maintenance file, we're done.
 609         $wp_filesystem->delete($maintenance_file);
 610
 611         // If we made it this far:
 612         do_action( '_core_updated_successfully', $wp_version );
 613
 614         return $wp_version;
 615 }
 616
 617 /**
 618  * Copies a directory from one location to another via the WordPress Filesystem Abstraction.
 619  * Assumes that WP_Filesystem() has already been called and setup.
 620  *
 621  * This is a temporary function for the 3.1 -> 3.2 upgrade only and will be removed in 3.3
 622  *
 623  * @ignore
 624  * @since 3.2.0
 625  * @see copy_dir()
 626  *
 627  * @param string $from source directory
 628  * @param string $to destination directory
 629  * @param array $skip_list a list of files/folders to skip copying
 630  * @return mixed WP_Error on failure, True on success.
 631  */
 632 function _copy_dir($from, $to, $skip_list = array() ) {
 633         global $wp_filesystem;
 634
 635         $dirlist = $wp_filesystem->dirlist($from);
 636
 637         $from = trailingslashit($from);
 638         $to = trailingslashit($to);
 639
 640         $skip_regex = '';
 641         foreach ( (array)$skip_list as $key => $skip_file )
 642                 $skip_regex .= preg_quote($skip_file, '!') . '|';
 643
 644         if ( !empty($skip_regex) )
 645                 $skip_regex = '!(' . rtrim($skip_regex, '|') . ')$!i';
 646
 647         foreach ( (array) $dirlist as $filename => $fileinfo ) {
 648                 if ( !empty($skip_regex) )
 649                         if ( preg_match($skip_regex, $from . $filename) )
 650                                 continue;
 651
 652                 if ( 'f' == $fileinfo['type'] ) {
 653                         if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) ) {
 654                                 // If copy failed, chmod file to 0644 and try again.
 655                                 $wp_filesystem->chmod($to . $filename, 0644);
 656                                 if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) )
 657                                         return new WP_Error('copy_failed', __('Could not copy file.'), $to . $filename);
 658                         }
 659                 } elseif ( 'd' == $fileinfo['type'] ) {
 660                         if ( !$wp_filesystem->is_dir($to . $filename) ) {
 661                                 if ( !$wp_filesystem->mkdir($to . $filename, FS_CHMOD_DIR) )
 662                                         return new WP_Error('mkdir_failed', __('Could not create directory.'), $to . $filename);
 663                         }
 664                         $result = _copy_dir($from . $filename, $to . $filename, $skip_list);
 665                         if ( is_wp_error($result) )
 666                                 return $result;
 667                 }
 668         }
 669         return true;
 670 }
 671
 672 /**
 673  * Redirect to the About WordPress page after a successful upgrade.
 674  *
 675  * This function is only needed when the existing install is older than 3.4.0.
 676  *
 677  * @since 3.3.0
 678  *
 679  */
 680 function _redirect_to_about_wordpress( $new_version ) {
 681         global $wp_version, $pagenow, $action;
 682
 683         if ( version_compare( $wp_version, '3.5-alpha', '>=' ) )
 684                 return;
 685
 686         // Ensure we only run this on the update-core.php page. wp_update_core() could be called in other contexts.
 687         if ( 'update-core.php' != $pagenow )
 688                 return;
 689
 690         if ( 'do-core-upgrade' != $action && 'do-core-reinstall' != $action )
 691                 return;
 692
 693         // Load the updated default text localization domain for new strings
 694         load_default_textdomain();
 695
 696         // See do_core_upgrade()
 697         show_message( __('WordPress updated successfully') );
 698
 699         $js_message = __( 'Welcome to WordPress %1$s. You will be redirected to the About WordPress screen. If not, click <a href="%s">here</a>.' );
 700         $js_message = str_replace( '"%s"', '"%2$s"', $js_message ); // in lieu of breaking the string.
 701
 702         // self_admin_url() won't exist when upgrading from <= 3.0, so relative URLs are intentional.
 703         show_message( '<span class="hide-if-no-js">' . sprintf( $js_message, $new_version, 'about.php?updated' ) . '</span>' );
 704         show_message( '<span class="hide-if-js">' . sprintf( __( 'Welcome to WordPress %1$s. <a href="%2$s">Learn more</a>.' ), $new_version, 'about.php?updated' ) . '</span>' );
 705         echo '</div>';
 706         ?>
 707 <script type="text/javascript">
 708 window.location = 'about.php?updated';
 709 </script>
 710         <?php
 711
 712         // Include admin-footer.php and exit
 713         include(ABSPATH . 'wp-admin/admin-footer.php');
 714         exit();
 715 }
 716 add_action( '_core_updated_successfully', '_redirect_to_about_wordpress' );