PHP two-dimensional array rectangular transpose

<?php
    
    //二维数组转置
    //定义一个二维数组

    $arr =array(array(1,2,3),array(4,5,6));

    //定义一个数组来放置转置的数据
    $arr1=array();

    //转置前遍历
    echo "转置前:
";
    for($i=0;$i<count($arr);$i++){
        
        for($j=0;$j<count($arr[$i]);$j++){
        
            echo $arr[$i][$j];
            
        }
        echo "
";
    }

    echo "转置前后:
";
    //确定装置后的行数
    for($j=0;$j<count($arr[0]);$j++){
        $arr1[$j]=array();
    }
    for($i=0;$i<count($arr);$i++){
        
        for($j=0;$j<count($arr[$i]);$j++){
        
            $arr1[$j][$i]= $arr[$i][$j];
            //echo $arr;
        }
    }

    //转置后遍历:
    for($k=0;$k<count($arr1);$k++){
        
        for($l=0;$l

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