php数组实现根据某个键值将相同键值合并生成新二维数组的方法

本文实例讲述了php数组实现根据某个键值将相同键值合并生成新二维数组的方法。分享给大家供大家参考，具体如下：

源数据：

    $infos = array(
      array(
        'a' => 36,
        'b' => 'xa',
        'c' => '2015-08-28 00:00:00',
        'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
      ),
      array(
        'a' => 3,
        'b' => 'vd',
        'c' => '2015-08-20 00:00:00',
        'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
      ),
      array(
        'a' => 6,
        'b' => 'wwe',
        'c' => '2015-08-28 00:00:00',
        'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
      ),
      array(
        'a' => 36,
        'b' => 'se',
        'c' => '2015-08-28 00:00:00',
        'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
      ),
      array(
        'a' => 6,
        'b' => 'aw',
        'c' => '2015-08-28 00:00:00',
        'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
      ),
      array(
        'a' => 36,
        'b' => 'bv',
        'c' => '2015-08-28 00:00:00',
        'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
      ),
      array(
        'a' => 12,
        'b' => 'xx',
        'c' => '2015-08-27 00:00:00',
        'd' => '2015/08/438488a00b3219929282e3652061c2e3.png'
      )
    );

处理要求：将数组中a相同的二维数组合并到一个数组中，生成一个新的数组

代码：

    <?php
     $result= array();
     foreach ($infos as $key => $info) {
      $result[$info['a']][] = $info;
     }
     print_r($result);

输出：

    Array
    (
     [36] => Array
      (
       [0] => Array
        (
         [a] => 36
         [b] => xa
         [c] => 2015-08-28 00:00:00
         [d] => 2015/08/438488a00b3219929282e3652061c2e3.png
        )
       [1] => Array
        (
         [a] => 36
         [b] => se
         [c] => 2015-08-28 00:00:00
         [d] => 2015/08/438488a00b3219929282e3652061c2e3.png
        )
       [2] => Array
        (
         [a] => 36
         [b] => bv
         [c] => 2015-08-28 00:00:00
         [d] => 2015/08/438488a00b3219929282e3652061c2e3.png
        )
      )
     [3] => Array
      (
       [0] => Array
        (
         [a] => 3
         [b] => vd
         [c] => 2015-08-20 00:00:00
         [d] => 2015/08/438488a00b3219929282e3652061c2e3.png
        )
      )
     [6] => Array
      (
       [0] => Array
        (
         [a] => 6
         [b] => wwe
         [c] => 2015-08-28 00:00:00
         [d] => 2015/08/438488a00b3219929282e3652061c2e3.png
        )
       [1] => Array
        (
         [a] => 6
         [b] => aw
         [c] => 2015-08-28 00:00:00
         [d] => 2015/08/438488a00b3219929282e3652061c2e3.png
        )
      )
     [12] => Array
      (
       [0] => Array
        (
         [a] => 12
         [b] => xx
         [c] => 2015-08-27 00:00:00
         [d] => 2015/08/438488a00b3219929282e3652061c2e3.png
        )
      )
    )

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