PHP跳出循环之“break”

<?php

header("Content-type:text/html;charset=utf-8");    //设置编码

while(true){                                                //使用while循环

    $tmp=rand(1,20);                                        //说明一个随机变量$tmp

    echo$tmp." ";                                          //输出生成的随机数

    if($tmp==10){                                           //判断生成的随机数是否等于10

        echo"<p>变量$tmp等于10，跳出循环</p>";

        break;                                               //如果等于10，使用break语句跳出循环

    }

}

?>

break$num

<?php

header("Content-type:text/html;charset=utf-8");    //设置编码

while(true){

    for(;;){

        for($i=0;$i<=10;$i++){

            echo$i." ";

            if($i==7){

                echo"<p>变量$i等于7，跳出一层循环</p>";

                break1 ;

            }

        }

        for($j=0;$j<=20;$j++){

            echo$j." ";

            if($j==15){

                echo"<p>变量$j等于15，跳出最外层循环</p>";

                break3;

            }

        }

    }

    echo"不会执行这句话";

}

?>