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WP_MatchesMapRegex::_map()

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

do the actual mapping

Return

(string)

Source

File: wp-includes/class-wp-matchesmapregex.php 

private function _map() {
		$callback = array( $this, 'callback' );
		return preg_replace_callback( $this->_pattern, $callback, $this->_subject );
	}

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/wp_matchesmapregex/_map