处理一个二维数组的问题

Question

$a=Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [337] => 
                )        )    [1] => Array
        (
            [0] => Array
                (
                    [73] => 101
                )            [1] => Array
                (
                    [337] => 121
                )        )    [2] => Array
        (
            [0] => Array
                (
                    [80] => 154
                )            [1] => Array
                (
                    [331] => 
                )            [2] => Array
                (
                    [337] => 
                )        )    [3] => Array
        (
            [0] => Array
                (
                    [331] => 152
                )            [1] => Array
                (
                    [337] => 
                )        )    [4] => Array
        (
            [0] => Array
                (
                    [76] => 129
                )            [1] => Array
                (
                    [76] => 128
                )            [2] => Array
                (
                    [337] => 
                )        )    [5] => Array
        (
            [0] => Array
                (
                    [337] => 
                )        )    [6] => Array
        (
            [0] => Array
                (
                    [73] => 101
                )            [1] => Array
                (
                    [331] => 
                )            [2] => Array
                (
                    [337] => 121
                )        )
）$b=array("0"=>array("num"=>7,"337"=>array("121"=>2)),
"1"=>array("num"=>2,"73"=>array("101"=>2)),
"2"=>array("num"=>1,"80"=>array("154"=>1)),
"3"=>array("num"=>3,"331"=>array("152"=>1),
"4"=>array("num"=>2,"76"=>array("129"=>1,"128"=>1)
));
遍历数组$a得到$b, 其中$b中的num 代码 代表$a中key值出现的次数，如：337出现了7次，num等于7
$b中是如：121 为2是表示 $a中121这个value值出现了2次，如果$a中value为空，就不用写了。求大侠解答

Answer 1

$bnum=array();
$bvalue=array();
foreach($a as $aitem1){
   foreach($aitem1 as $aitem2){
   foreach($aitem2 as $key=>$value){
$bnum[$key]=intval($bnum[$key])+1;
if($value!=""){
$bvalue[$key][$value]=intval($bvalue[$key][$value])+1;
}
   }
   }
}
$b=array();
foreach($bnum as $key=>$num){
$b[]=array("num"=>$num,$key=>$bvalue[$key]);
}
print_r($b);