Online PHP editor | output for e39gP

<?php $start_key = 0; //Sample data $array = array ( array("id"=> "user-1", "name"=>"Rifas", "email"=>"email@gmail.com"), array("id"=> "user-12", "name"=>"Althaf", "email"=>"email@gmail.com"), array("id"=> "user-13", "name"=>"Farhan", "email"=>"email@gmail.com"), array("id"=> "user-101", "name"=>"Safwan", "email"=>"email@gmail.com") ); $mapped = array_map( function ($v, $k) { global $start_key; if($v['id'] == "user-12"){ $start_key = $k; } }, $array, array_keys($array)); print($start_key); $start_key = array_search('user-12', array_column($array, 'id')); echo $start_key;