Needed to loop through a multiarray and replace {id} with something inside a class. Lambda functions FTW

AWESOME.php

/**
* Loop through the meta fields looking for things to replace
* @param array $replace
*/
protected function _metaReplacements(array $replace)
{
    $doReplace = function(&$item, $key) use ($replace) {
        foreach($replace AS $needle => $replace) {
            $item = preg_replace('/'. $needle .'/', $replace, $item);
        }
    };
    array_walk_recursive($this->_restResponse['head'], $doReplace);
}