二维数组过滤相同元素 并计算和值函数

<?php
$array = array (
		Array ("goods_id" => "001", "goods_num" => 5 ), 
		Array ("goods_id" => "002", "goods_num" => 10 ), 
		Array ("goods_id" => "003", "goods_num" => 3 ), 
		Array ("goods_id" => "002", "goods_num" => 4 ) 
		);

/**
 * 二维数组过滤相同元素 并计算和值
 * 2011-07-18
 */
function array_2d_count_key($_2dArray, $key, $key2) {
	$nArray = array ();
	foreach ( $_2dArray as $k ) {
		$ckey = $k [$key];
		$cVal = $k [$key2];
		$cArray = array ($ckey => $cVal );
		if (array_key_exists ( $ckey, $nArray )) {
			$nArray [$ckey] = $cVal + $nArray [$ckey];
		} else {
			$nArray [$ckey] = $cVal;
		}
	}
	return $nArray;
}

print_r ( array_2d_count_key ( $array, 'goods_id', 'goods_num' ) );
?>

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