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<?php function __( $str ) { return $str; } function _doing_it_wrong( $func, $error_message, $version ) { trigger_error( $error_message, E_USER_NOTICE ); } class WP_List_Util { /** * The input array. * * @since 4.7.0 * @var array */ private $input = array(); /** * The output array. * * @since 4.7.0 * @var array */ private $output = array(); /** * Temporary arguments for sorting. * * @since 4.7.0 * @var string[] */ 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 = $input; $this->input = $input; } public function pluck( $field, $index_key = null ) { $newlist = array(); 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 ) ) { $newlist[ $key ] = $value->$field; } elseif ( is_array( $value ) ) { $newlist[ $key ] = $value[ $field ]; } else { _doing_it_wrong( __METHOD__, __( 'Values for the input array must be either objects or arrays.' ), '6.2.0' ); } } $this->output = $newlist; 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. */ foreach ( $this->output as $value ) { if ( is_object( $value ) ) { if ( isset( $value->$index_key ) ) { $newlist[ $value->$index_key ] = $value->$field; } else { $newlist[] = $value->$field; } } elseif ( is_array( $value ) ) { if ( isset( $value[ $index_key ] ) ) { $newlist[ $value[ $index_key ] ] = $value[ $field ]; } else { $newlist[] = $value[ $field ]; } } else { // _doing_it_wrong( // __METHOD__, // __( 'Values for the input array must be either objects or arrays.' ), // '6.2.0' // ); } } $this->output = $newlist; return $this->output; } } function wp_list_pluck( $input_list, $field, $index_key = null ) { if ( ! is_array( $input_list ) ) { return array(); } $util = new WP_List_Util( $input_list ); return $util->pluck( $field, $index_key ); } /* * Test with an array of arrays. */ $input_list = array( array( '123' => '456' ), array( 'foo' => 'bar' ), array( 'foo' => 'baz' ), ); var_dump( array_column( $input_list, 'foo', null ) ); var_dump( wp_list_pluck( $input_list, 'foo', null ) ); /* * Test with an array of objects. */ $input_list = array( (object) array( '123' => '456' ), (object) array( 'foo' => 'bar' ), (object) array( 'foo' => 'baz' ), ); var_dump( wp_list_pluck( $input_list, 'foo', null ) );