Выбрать первый элемент массива
<?php
$testArray = array("key1" => "value3","key3" => "value1","key2" => "key2");
$firstElement = array_shift($stack);
print_r($firstElement);
//выведет array("key1" => "value3");
?>
<?php
$testArray = array("key1" => "value3","key3" => "value1","key2" => "key2");
$firstElement = array_shift($stack);
print_r($firstElement);
//выведет array("key1" => "value3");
?>