php判断数组中有几个重复的值 所有值出现的次数。

$arr=array("A","Cat","Dog","A","Dog",1,2,3,3,2,1);
echo "原数组:";
var_dump($arr);
echo "数组各值的出现次数:";
$arr2=array_count_values($arr);
var_dump($arr2);