PHP determines the number of dimensions of an array

php method to determine how many dimensions an array is: first obtain the array that needs to be determined; then use the custom "aL" method to determine how many dimensions the array is; finally use the "max($al)" method Just get the dimensions of the array.

##PHP Gets the number of dimensions of an array

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// 判断数组是几维数组
$data = array(); // 是你要判断的数组
$al = array(0);
function aL($data,&$al,$level=0){
    if(is_array( $data )){
        $level++;
        $al[] = $level;
        foreach($data as $v){
            aL($v,$al,$level);
        }
    }
}
aL($data,$al);
$num_level = max($al);
// $num_level 就是你要获取的数组的维度

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