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run code in 150+ php & hhvm versions
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<?php $_POST["balle"]["x"] = 7; $_POST["balle"]["y"] = 32; $_POST["balle"]["z"] = 17; $needle = "z"; $samp = Check_post($_POST,$needle); echo $samp; function Check_post($array,$needle) { if(is_array($array)) { foreach($array as $key=>$value) { if($key == $needle) { echo $key." key exists "; } else { if(is_array($value)) { check_post($value,$needle); } } } } } ?>
Output for 4.3.0 - 7.1.0
z key exists