multi_array_key_exists

multi_array_key_exists.php

<?php

function multi_array_key_exists($needle, $haystack)
{
	foreach ($haystack as $key => $value)
	{
		if ($needle === $key)
		{
			return $key;
		}

		if (is_array($value))
		{
			if(multi_array_key_exists($needle, $value))
			{
				return true;
			}
		}
	}

	return false;
}