- array_search: documentation ( source)
<?php
$students=array(
"name"=>array("akash","jag", "rahul"),
"id"=>array(01,02,03),
"age"=>array(22,22,22),
);
/*print_r($students);
unset($students["name"][0]);
print_r($students);*/
//print_r(array_values($students));
//print_r(array_keys($students));
$key=array_search("akash", $students);