PHP数组,该如何处理

PHP 数组
Array
(
[0] => pid=2
[1] => action=save
[2] => 9=a
[3] => 10=a
[4] => 14=a
[5] => 20=a
[6] => 15=a
[7] => 15=b
[8] => 21=a
[9] => 21=b
[10] => 16=c
[11] => 16=d
[12] => 19=c
[13] => 19=d
[14] => 17=we
[15] => 22=keywork
[16] => 18=you
[17] => 23=thanks
)

上面数组，如何把它转成下面样子:

Array
(
[0] => pid=2
[1] => action=save
[2] => 9=a
[3] => 10=a
[4] => 14=a
[5] => 20=a
[6] => 15=ab
[7] => 21=ab
[8] => 16=cd
[9] => 19=cd
[10] => 17=we
[11] => 22=keywork
[12] => 18=you
[13] => 23=thanks
)
PHP数组

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------解决方案--------------------

$a = array(

  'pid=2',

  'action=save',

  '9=a',

  '10=a',

  '14=a',

  '20=a',

  '15=a',

  '15=b',

  '21=a',

  '21=b',

  '16=c',

  '16=d',

  '19=c',

  '19=d',

  '17=we',

  '22=keywork',

  '18=you',

  '23=thanks',

);

foreach($a as $v) list($b[$v][],$v) = array_reverse(explode('=', $v));

array_walk($b, create_function('&$v,$k', '$v="$k=".join("",$v);'));

print_r(array_values($b));

Array

(

    [0] => pid=2

    [1] => action=save

    [2] => 9=a

    [3] => 10=a

    [4] => 14=a

    [5] => 20=a

    [6] => 15=ab

    [7] => 21=ab

    [8] => 16=cd

    [9] => 19=cd

    [10] => 17=we

    [11] => 22=keywork

    [12] => 18=you

    [13] => 23=thanks

)