Question

急！！！！！求大神指点 php中的count()函数如何在二维数组中使用

我创建了一个二维数组如下：顺序是 品牌，颜色，大小，价钱

$pens=array(
"p1"=>array("brand"=>"aaa","color"=>"red","size"=>11,"price"=>20),
"p2"=>array("brand"=>"bbb","color"=>"yellow","size"=>10,"price"=>20),
"p3"=>array("brand"=>"aaa","color"=>"blue","size"=>12,"price"=>30),
"p3"=>array("brand"=>"ccc","color"=>"blue","size"=>12,"price"=>30)

"p4"......(省略)....
"p100..."；

);

现在我想找到不同品牌下有多少个商品存货，怎么做？就是比如有多少个aaa,多少个bbb。
严格说应该是在总共有多少brand，brand里面有多少个aaa,多少个bbb。

Answer 1

<?php
    $pens=array(
        "p1"=>array("brand"=>"aaa","color"=>"red","size"=>11,"price"=>20),
        "p2"=>array("brand"=>"bbb","color"=>"yellow","size"=>10,"price"=>20),
        "p3"=>array("brand"=>"aaa","color"=>"blue","size"=>12,"price"=>30),
        "p4"=>array("brand"=>"ccc","color"=>"blue","size"=>12,"price"=>30)
        //"p4"......(省略)....
        //"p100..."；
 );
getBrands($pens);
function getBrands($arr){
    $temp=array();
    foreach($arr as $v){
        $temp[]=$v['brand'];
    }
       
    $brarr=array_count_values($temp);
    $brandCount=count($brarr);
    echo "共".$brandCount.'个品牌';
    echo "<br>";
    foreach ($brarr as $k=>$v) {
        echo $k.':'.$v;
        echo "<br>";
    }
}