do the actual mapping
Source
private function _map() {
$callback = array( $this, 'callback' );
return preg_replace_callback( $this->_pattern, $callback, $this->_subject );
}
WP_MatchesMapRegex::_map(): string
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.
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