m*n 矩阵中求正方形个数

<?php
/**
 * Notes:
 * User: liubing17
 * DateTime: 2019-10-17 17:10
 */
function get($m, $n){
    /*
     * 获取m*n矩阵正方形的个数
     * */
    if($m*$n <=0 ){
        return 0;
    }
    $total = 0;
    while($m>0 && $n>0){
        $total += $m*$n;
        $m--;
        $n--;
    }
    return $total;
}
echo get(1,1).PHP_EOL;