php - 如何在 PHP 中按键值对关联数组的数组进行排序

Question

很难解释，所以这里是一个例子:

$strings = array(
   array("languageCode" => "ES",  "string" => "hola"),
   array("languageCode" => "EN",  "string" => "hello"),
   array("languageCode" => "IT",  "string" => "ciao"),
   array("languageCode" => "CHS", "string" => "您好"),
);

我想通过定义顺序按 languageCode 值对字符串进行排序:

function magicStringOrder(array $strings, array $languageCodeOrder){
    // ....
    return $strings;
}

$strings = magicStringOrder($strings, array('EN', 'IT') );

$strings = array(
   array("languageCode" => "EN",  "string" => "hello"),
   array("languageCode" => "IT",  "string" => "ciao"),
   array("languageCode" => "ES",  "string" => "hola"),
   array("languageCode" => "CHS", "string" => "您好"),
);

有magicStringOrder吗？

我现在知道这是一个简单的问题，只需几个循环即可解决。我需要一个非常快的函数(它被调用很多次，使用大数组)

Answer 1

另一个没有 PHP 排序功能的想法:

// sort by cmp $arr[$magic_key] <-> arr $magic_order
function magicSort($arr, $magic_key="", $magic_order = array())
{
  $sorted = array();
  foreach($magic_order AS $v) {
    foreach($arr AS $k2 => $v2) {
      if($v===$v2[$magic_key]) {
        $sorted[] = $v2;
        unset($arr[$k2]);
      }
    }
  }

  // attach what's left
  return array_merge($sorted, $arr);
}

Test it at eval.in (链接即将过期)

$strings = array(
   array("languageCode" => "ES",  "string" => "hola"),
   array("languageCode" => "EN",  "string" => "hello"),
   array("languageCode" => "IT",  "string" => "ciao"),
   array("languageCode" => "CHS", "string" => "??"),
);

print_r(magicSort($strings, "languageCode", array("EN", "IT")));

输出到:

Array
(
    [0] => Array
        (
            [languageCode] => EN
            [string] => hello
        )

    [1] => Array
        (
            [languageCode] => IT
            [string] => ciao
        )

    [2] => Array
        (
            [languageCode] => ES
            [string] => hola
        )

    [3] => Array
        (
            [languageCode] => CHS
            [string] => 您好
        )

)

$magic_order 也可以为空。如果是这样，则仅重新索引该数组。 $magic_order 中不存在的值数组会下移并保持其顺序。

不确定，这是否正是您所需要的。