PHP流程控制语句-while、do..while循环语句

最新推荐文章于 2022-01-08 17:28:41 发布

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本文通过两个具体的PHP示例，详细解析了while和do-while循环的使用方式及区别。通过输出指定范围内的偶数和根据条件重复执行代码块，展示了不同循环结构的特点。

<?php

    function cover_EvenNumbers($obj){
        $i=1;
        while ($i <= $obj) {
            if ($i % 2 ==0) {
                echo "$i ";
            }
            $i++;
        }
    }

    cover_EvenNumbers(100);
?>

do while和while的区别是，do里面的那个100%会跑。。。

<?php

    function doWhile_Test($obj){
        $i=1;
        while ($obj ==2) {
            if($i==25){
                return;
            }
            echo "the obj is 2!!<br>";
            $i++;
        }
        do {
            echo "the obj is $obj<br>";
        } while ($obj ==2);//while 循环里面写的要和下面do-while匹配上
    }

    doWhile_Test(2);
?>

the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!
the obj is 2!!