iterates through key-value array and returns array with defined keys values

array_key_value

/**
 * iterates through key-value array and returns array with defined keys values
 * @var		Array	 $array
		String	 $key
 * @return	Array
*/
function array_key_value($array, $key) {
	$output = array();

	foreach($array as $a)
		if (array_key_exists($key, $a))
			$output[] = $a[$key];
	
	return $output;
}