Example code for how to determine the dimensions of an array and whether the array is empty in PHP

The following is a detailed analysis and introduction to the code for determining the dimensions of the php array. For reference, the code is as follows:

<?php 
/** 
 * 返回数组的维度 
 * @param  [type] $arr [description] 
 * @return [type]      [description] 
 */
function arrayLevel($arr){ 
    $al = array(0); 
    function aL($arr,&$al,$level=0){ 
        if(is_array($arr)){ 
            $level++; 
            $al[] = $level; 
            foreach($arr as $v){ 
                aL($v,$al,$level); 
            } 
        } 
    } 
    aL($arr,$al); 
    return max($al); 
} 

$arr = array( 
    &#39;0&#39;=>&#39;0&#39;, 
); 

echo arrayLevel($arr); 
?>

The following is the method to determine if the array is empty: empty($arr), the code is as follows

$arr= array(""); 
$result = empty($arr); 
//$result = false 
$arr = array(); 
$result = empty($arr); 
//$result = true

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