PHP关联数组重复键 [英] PHP Associative Array Duplicate Keys

问题描述

我有一个关联数组，但是当我使用以下函数向其添加值时，它似乎会覆盖相同的键.有没有办法让多个相同的键具有不同的值?还是有另一种格式的数组具有相同的格式?

I have an associative array, however when I add values to it using the below function it seems to overwrite the same keys. Is there a way to have multiple of the same keys with different values? Or is there another form of array that has the same format?

我想要拥有:

42=>56
42=>86
42=>97
51=>64
51=>52
etc etc

代码:

   function array_push_associative(&$arr) {
       $args = func_get_args();
       foreach ($args as $arg) {
           if (is_array($arg)) {
               foreach ($arg as $key => $value) {
                   $arr[$key] = $value;
                   $ret++;
               }
           }else{
               $arr[$arg] = "";
           }
       }
       return $ret;
    }

推荐答案

否，关联数组中不能有多个相同的键.

No, you cannot have multiple of the same key in an associative array.

但是，您可以具有唯一的键，每个键的对应值都是数组，并且这些数组的每个键都有多个元素.

You could, however, have unique keys each of whose corresponding values are arrays, and those arrays have multiple elements for each key.

所以代替这个...

42=>56 42=>86 42=>97 51=>64 51=>52

...你有这个:

Array (
    42 => Array ( 56, 86, 97 )
    51 => Array ( 64, 52 )
)

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