Online PHP editor | output for st7Xb

<?php $credentials = "Authorization: OAuth oauth_consumer_key=g3PdEVqZnBgaecDGpQjODcSLm, oauth_nonce=3346472044-54KLfYYlu9P1eAXN3Le3P8hgtzt4creTd41tfJRg3PdEVqZnBgaecDGpQjODcSLm1444413587932, oauth_signature=FHnxlpBl9h3ckb8GQLfw+D3FCaU=, oauth_signature_method=HMAC-SHA1, oauth_timestamp=1444413587, oauth_token=3346472044-54KLfYYlu9P1eAXN3Le3P8hgtzt4creTd41tfJR, oauth_version=1.0"; $arrayCredentials = explode(',',$credentials); dump($arrayCredentials); $needle = 'oauth_signature'; $ret = array_keys(array_filter($arrayCredentials, function($var) use ($needle){ return strpos($var, $needle) !== false; })); echo($ret);