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php foreach/for循环跳出问题

Jun 13, 2016 am 10:15 AM
forforeachphpandexistcycleyesuseJump

在php 中for循环与foreach是常用的两个函数,for是用于数字较多,而foreach一般用于数组遍历中。

 代码如下 复制代码

 

//php当前循环为1,循环由里到外依次递增,break默认为1,例如跳出第2层循环
for ($i=0;$i     foreach (array(1,2,3) as $val){    
        foreach (array(1,2,3) as $val){         
            echo "1层循环
"; 
            break 2;  //跳出第2层循环        
        }
        echo "2层循环
";
    }
    echo "3层循环
";
}
//结果:
//1层循环
//3层循环
//1层循环
//3层循环
//1层循环
//3层循环

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