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recursive-array-search upgraded so that it can find multiple keys which it returns as an array. If there is only one key to be found, it will return it as a variable.
public function recursive_array_search($needle,$haystack) {
$keysFound = array();
foreach($haystack as $key=>$value) {
if($needle===$value OR is_array($value) && $this->recursive_array_search($needle,$value) !== false) {
$keysFound[] = $current_key;
if (count($keysFound) > 1) { return $keysFound; }
elseif (count($keysFound) == 1) { return $keysFound[0]; }
else { return false; }
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