仅获取具有某些键的数组元素 [英] Get only the array elements with certain keys

问题描述

可能重复:
阵列键上的模式匹配

Possible Duplicate:
Pattern Match on a Array Key

我需要使用特定的键模式获取数组中的所有元素.例如在以下数组中:

I need to get all the elements in an array with a specific key pattern. For example in this array:

$items = array(
   "a"         => "1",
   "b"         => "2",
   "special_1" => "3",
   "c"         => "4",
   "special_2" => "5",
   "special_3" => "6",
   "d"         => "7"
);

我需要所有带有包含字符串special_的键的元素.这些应该定义一个新的数组:

I would need all elements with a key containing the string special_. These should define a new array:

$special_items = array(
   "special_1" => "3",
   "special_2" => "5",
   "special_3" => "6",
);

除了while循环外，还有一种聪明的方法吗?

Is there a smart method besides a while loop?

推荐答案

如何?

$special_items = array();

foreach($items as $key => $val) {
    if(substr($key, 0, 8) == 'special_')
        $special_items[$key] = $val;
}

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