--- /dev/null
+<?php
+/**
+ * WordPress List utility class
+ *
+ * @package WordPress
+ * @since 4.7.0
+ */
+
+/**
+ * List utility.
+ *
+ * Utility class to handle operations on an array of objects.
+ *
+ * @since 4.7.0
+ */
+class WP_List_Util {
+ /**
+ * The input array.
+ *
+ * @since 4.7.0
+ * @access private
+ * @var array
+ */
+ private $input = array();
+
+ /**
+ * The output array.
+ *
+ * @since 4.7.0
+ * @access private
+ * @var array
+ */
+ private $output = array();
+
+ /**
+ * Temporary arguments for sorting.
+ *
+ * @since 4.7.0
+ * @access private
+ * @var array
+ */
+ private $orderby = array();
+
+ /**
+ * Constructor.
+ *
+ * Sets the input array.
+ *
+ * @since 4.7.0
+ *
+ * @param array $input Array to perform operations on.
+ */
+ public function __construct( $input ) {
+ $this->output = $this->input = $input;
+ }
+
+ /**
+ * Returns the original input array.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @return array The input array.
+ */
+ public function get_input() {
+ return $this->input;
+ }
+
+ /**
+ * Returns the output array.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @return array The output array.
+ */
+ public function get_output() {
+ return $this->output;
+ }
+
+ /**
+ * Filters the list, based on a set of key => value arguments.
+ *
+ * @since 4.7.0
+ *
+ * @param array $args Optional. An array of key => value arguments to match
+ * against each object. Default empty array.
+ * @param string $operator Optional. The logical operation to perform. 'AND' means
+ * all elements from the array must match. 'OR' means only
+ * one element needs to match. 'NOT' means no elements may
+ * match. Default 'AND'.
+ * @return array Array of found values.
+ */
+ public function filter( $args = array(), $operator = 'AND' ) {
+ if ( empty( $args ) ) {
+ return $this->output;
+ }
+
+ $operator = strtoupper( $operator );
+
+ if ( ! in_array( $operator, array( 'AND', 'OR', 'NOT' ), true ) ) {
+ return array();
+ }
+
+ $count = count( $args );
+ $filtered = array();
+
+ foreach ( $this->output as $key => $obj ) {
+ $to_match = (array) $obj;
+
+ $matched = 0;
+ foreach ( $args as $m_key => $m_value ) {
+ if ( array_key_exists( $m_key, $to_match ) && $m_value == $to_match[ $m_key ] ) {
+ $matched++;
+ }
+ }
+
+ if (
+ ( 'AND' == $operator && $matched == $count ) ||
+ ( 'OR' == $operator && $matched > 0 ) ||
+ ( 'NOT' == $operator && 0 == $matched )
+ ) {
+ $filtered[$key] = $obj;
+ }
+ }
+
+ $this->output = $filtered;
+
+ return $this->output;
+ }
+
+ /**
+ * Plucks a certain field out of each object in the list.
+ *
+ * This has the same functionality and prototype of
+ * array_column() (PHP 5.5) but also supports objects.
+ *
+ * @since 4.7.0
+ *
+ * @param int|string $field Field from the object to place instead of the entire object
+ * @param int|string $index_key Optional. Field from the object to use as keys for the new array.
+ * Default null.
+ * @return array Array of found values. If `$index_key` is set, an array of found values with keys
+ * corresponding to `$index_key`. If `$index_key` is null, array keys from the original
+ * `$list` will be preserved in the results.
+ */
+ public function pluck( $field, $index_key = null ) {
+ if ( ! $index_key ) {
+ /*
+ * This is simple. Could at some point wrap array_column()
+ * if we knew we had an array of arrays.
+ */
+ foreach ( $this->output as $key => $value ) {
+ if ( is_object( $value ) ) {
+ $this->output[ $key ] = $value->$field;
+ } else {
+ $this->output[ $key ] = $value[ $field ];
+ }
+ }
+ return $this->output;
+ }
+
+ /*
+ * When index_key is not set for a particular item, push the value
+ * to the end of the stack. This is how array_column() behaves.
+ */
+ $newlist = array();
+ foreach ( $this->output as $value ) {
+ if ( is_object( $value ) ) {
+ if ( isset( $value->$index_key ) ) {
+ $newlist[ $value->$index_key ] = $value->$field;
+ } else {
+ $newlist[] = $value->$field;
+ }
+ } else {
+ if ( isset( $value[ $index_key ] ) ) {
+ $newlist[ $value[ $index_key ] ] = $value[ $field ];
+ } else {
+ $newlist[] = $value[ $field ];
+ }
+ }
+ }
+
+ $this->output = $newlist;
+
+ return $this->output;
+ }
+
+ /**
+ * Sorts the list, based on one or more orderby arguments.
+ *
+ * @since 4.7.0
+ *
+ * @param string|array $orderby Optional. Either the field name to order by or an array
+ * of multiple orderby fields as $orderby => $order.
+ * @param string $order Optional. Either 'ASC' or 'DESC'. Only used if $orderby
+ * is a string.
+ * @param bool $preserve_keys Optional. Whether to preserve keys. Default false.
+ * @return array The sorted array.
+ */
+ public function sort( $orderby = array(), $order = 'ASC', $preserve_keys = false ) {
+ if ( empty( $orderby ) ) {
+ return $this->output;
+ }
+
+ if ( is_string( $orderby ) ) {
+ $orderby = array( $orderby => $order );
+ }
+
+ foreach ( $orderby as $field => $direction ) {
+ $orderby[ $field ] = 'DESC' === strtoupper( $direction ) ? 'DESC' : 'ASC';
+ }
+
+ $this->orderby = $orderby;
+
+ if ( $preserve_keys ) {
+ uasort( $this->output, array( $this, 'sort_callback' ) );
+ } else {
+ usort( $this->output, array( $this, 'sort_callback' ) );
+ }
+
+ $this->orderby = array();
+
+ return $this->output;
+ }
+
+ /**
+ * Callback to sort the list by specific fields.
+ *
+ * @since 4.7.0
+ * @access private
+ *
+ * @see WP_List_Util::sort()
+ *
+ * @param object|array $a One object to compare.
+ * @param object|array $b The other object to compare.
+ * @return int 0 if both objects equal. -1 if second object should come first, 1 otherwise.
+ */
+ private function sort_callback( $a, $b ) {
+ if ( empty( $this->orderby ) ) {
+ return 0;
+ }
+
+ $a = (array) $a;
+ $b = (array) $b;
+
+ foreach ( $this->orderby as $field => $direction ) {
+ if ( ! isset( $a[ $field ] ) || ! isset( $b[ $field ] ) ) {
+ continue;
+ }
+
+ if ( $a[ $field ] == $b[ $field ] ) {
+ continue;
+ }
+
+ $results = 'DESC' === $direction ? array( 1, -1 ) : array( -1, 1 );
+
+ if ( is_numeric( $a[ $field ] ) && is_numeric( $b[ $field ] ) ) {
+ return ( $a[ $field ] < $b[ $field ] ) ? $results[0] : $results[1];
+ }
+
+ return 0 > strcmp( $a[ $field ], $b[ $field ] ) ? $results[0] : $results[1];
+ }
+
+ return 0;
+ }
+}
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