PHP method to determine whether an array is one-dimensional or two-dimensional

How does PHP determine whether an array is one-dimensional or two-dimensional? Below we will use code to teach you how to determine.

1. First we have a PHP built-in function count();

count(array,mode); array是数组，mode默认为0，1是递归的计数
<?php   
if(count($arr) == count($arr,1)){  
     echo "是一维";  
}else{  
     echo "不是一维";  
}

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