array_path.php

function array_path($array, $path) {
	$matches = preg_split("/\[|\]/", $path, -1, PREG_SPLIT_NO_EMPTY);
	if(empty($matches)) {
		return null;
	}	
	$data = $array;
	foreach($matches as $key) {
		if(!array_key_exists($data, $matches)) {
			return null;
		}
		$data = $data[$key];
	}

	return $data;
}


$data = array(
	'one' => array(
		'two' => 'three'
	),
	'four' => array(
		'five' => 'six'
	)
);

$result = array_path($data, 'one[two]');


print_r($result);
// outputs: three