PHP：文本的替代值与正则表达式或浸渍表达阵列

Question

下面是我的阵列，在这里我想和喜欢完整路径替换[image] => 201310171708033183470.jpg：

[image] => http://localhost/website/uploads/201310171708033183470.jpg 

我想给一个完整路径的所有图像名称如下：

[images] => Array 
      (
       [0] => Array 
        (
         [id] => 12 
         [product_id] => 9 
         [image] => 201310171708033183470.jpg 
         [order] => 1 
         [status] => 1 
         [created] => 2013-10-17 17:08:03 
         [modified] => 2013-10-17 17:08:03 
        ) 

       [1] => Array 
        (
         [id] => 11 
         [product_id] => 9 
         [image] => 201310171514176427410.jpg 
         [order] => 1 
         [status] => 1 
         [created] => 2013-10-17 15:14:17 
         [modified] => 2013-10-17 15:14:17 
        ) 

       [2] => Array 
        (
         [id] => 10 
         [product_id] => 9 
         [image] => 201310171514066591090.jpg 
         [order] => 1 
         [status] => 1 
         [created] => 2013-10-17 15:14:06 
         [modified] => 2013-10-17 15:14:06 
        ) 

       [3] => Array 
        (
         [id] => 9 
         [product_id] => 9 
         [image] => 201310171513591880300.jpg 
         [order] => 1 
         [status] => 1 
         [created] => 2013-10-17 15:13:59 
         [modified] => 2013-10-17 15:13:59 
        ) 

      ) 

哪种做法最快最优化？

Answer 1

必须使用&用foreach使用变量本身，而不是变量的副本。

foreach($products as &$product) { 
    $product['image'] = 'http://localhost/website/uploads/' . $product['image']; 
} 

的另一种方法是使用array_map：

function addpath($product){ 
    $product['image'] = 'http://localhost/website/uploads/' . $product['image']; 
    return $product; 
} 
$products = array_map('addpath', $products); 

或者array_walk：

function addpath(&$product) { 
    $product['image'] = 'http://localhost/website/uploads/' . $product['image']; 
} 
array_walk($products, 'addpath'); 

为了您的测试序列中，第一种方式似乎更快。对于一个巨大的数组（70000项），您可以获得foreach < array_walk < array_map，比其他两个foreach约快1.5倍。

Answer 2

希望它可以帮助，

foreach($images as $k=>$image){ 

     $image['image'] = 'http://localhost/website/uploads/'.$image['image']; 
    }