打印指定順序矩陣

01 02 03 04
12 13 14 05
11 16 15 06
10 09 08 07
打印如上順序的矩陣代碼

<?php
function sort_matrix($n){
$start_row = 0; $start_col = 0; $end_row = $n - 1; $end_col = $n - 1;
$row = 0; $col = 0; $type = 1;
$matrix_arr = [];

for($k = 1; $k <= $n * $n; ++$k){
        $matrix_arr[$row][$col] = $k;
        if($type == 1){//第一行                
            ++$col;
        }elseif($type == 2){//最後一列
            ++$row;         
        }elseif($type == 3){//最後一行              
            --$col;
        }elseif($type == 4){//第一列               
            --$row;
        }

        if($type == 1 && $col > $end_col){//遍歷未賦值的首行後開始行變量+1
            ++$start_row;
            $row = $start_row;
            $col = $end_col;
            $type = 2;//隨後處理最後一列
        }elseif($type == 2 && $row > $end_row){//遍歷最後一列後
            --$end_col;
            $row = $end_row;
            $col = $end_col;
            $type = 3;//隨後處理最後一行
        }elseif($type == 3 && $col < $start_col){//遍歷最後一行後
            --$end_row;
            $row = $end_row;
            $col = $start_col;
            $type = 4;//隨後處理第一列
        }elseif($type == 4 && $row < $start_row){//遍歷第一列後
            ++$start_col;
            $row = $start_row;
            $col = $start_col;
            $type = 1;//隨後處理第一行
        }
    }

    return $matrix_arr;
}
//打印row行,col列矩陣
function print_matrix($matrix_arr, $row, $col){
    for($i = 0; $i < $row; ++$i){
        for($j = 0; $j < $col; ++$j){
            echo sprintf("%02d", $matrix_arr[$i][$j]) . " ";
        }
        echo "<br />";
    }       
}

$n = 4;
$matrix_arr = sort_matrix($n);
print_matrix($matrix_arr, $n, $n);

?>