<?php

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/**

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* WP_MatchesMapRegex helper class

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*

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* @package WordPress

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* @since 4.7.0

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*/

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/**

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* Helper class to remove the need to use eval to replace $matches[] in query strings.

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*

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* @since 2.9.0

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*/

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class WP_MatchesMapRegex {

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/**

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* store for matches

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*

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* @var array

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*/

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private $_matches;

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/**

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* store for mapping result

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*

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* @var string

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*/

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public $output;

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/**

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* subject to perform mapping on (query string containing $matches[] references

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*

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* @var string

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*/

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private $_subject;

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/**

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* regexp pattern to match $matches[] references

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*

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* @var string

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*/

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public $_pattern = '(\$matches\[[1-9]+[0-9]*\])'; // Magic number.

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/**

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* constructor

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*

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* @param string $subject subject if regex

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* @param array $matches data to use in map

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*/

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public function __construct( $subject, $matches ) {

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$this->_subject = $subject;

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$this->_matches = $matches;

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$this->output = $this->_map();

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}

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/**

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* Substitute substring matches in subject.

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*

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* static helper function to ease use

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*

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* @param string $subject subject

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* @param array $matches data used for substitution

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* @return string

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*/

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public static function apply( $subject, $matches ) {

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$oSelf = new WP_MatchesMapRegex( $subject, $matches );

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return $oSelf->output;

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}

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/**

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* do the actual mapping

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*

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* @return string

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*/

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private function _map() {

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$callback = array( $this, 'callback' );

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return preg_replace_callback( $this->_pattern, $callback, $this->_subject );

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}

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/**

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* preg_replace_callback hook

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*

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* @param array $matches preg_replace regexp matches

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* @return string

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*/

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public function callback( $matches ) {

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$index = (int) substr( $matches[0], 9, -1 );

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return ( isset( $this->_matches[ $index ] ) ? urlencode( $this->_matches[ $index ] ) : '' );

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}

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}

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