- var_dump: documentation ( source)
- array_search: documentation ( source)
- in_array: documentation ( source)
<?php
$arr = array();
$arr["a"] = array("c" => "A");
$arr["b"] = array("d" => "B");
/*$str = array_filter($arr, function($e1){
echo $e1;
return $e1;
});*/
$str = array_search("c", $arr);
var_dump($str);
var_dump(in_array("B", $arr));