


Detailed graphic and text explanation of PHP process control statement expansion
循环相关的语句:break
表示结束当前的for ,while,do while,switch循环
快速入门
<?php for($i=0;$i<13;$i++){ echo '$i='.$i."<br/>"; if($i==10){ break; } } ?>;
结果:
$i=0
$i=1
$i=2
$i=3
$i=4
$i=5
$i=6
$i=7
$i=8
$i=9
$i=10
快速入门2:
代码:
<?php $i=0; while(++$i){ switch($i){ case 5: echo "quit at 5<br/>"; break; case 10: echo "quit at 10<br/>"; break 2; default: break; } } echo '$i='.$i; ?>
图解:
运行结果:
quit at 5
quit at 10
$i=10
从上面案例看出:我们得:
1,break语句,默认跳出一层
2,break语句后面带的数字,不能超过实际可跳出的循环层数
基本概念:continue用于结束本次循环剩余代码,从新开始新的一次循环
(如果条件为真,就继续执行),continue后面也可以带数字,表示从第几次循环重新开始
快速入门:
代码:
<?php for($i=0;$i<13;$i++){ if($i==3){ continue; } echo '$i='.$i."<br/>"; } echo "hello"; ?>
图解:
运行结果:
$i=0
$i=1
$i=2
$i=4
$i=5
$i=6
$i=7
$i=8
$i=9
$i=10
$i=11
$i=12
hello
案例2:
<?php for($i=0;$i<2;$i++){ for($j=1;$j<4;$j++){ if($j==2){ continue 2; } echo '$i='.$i.'$j='.$j."<br/>"; } } echo "测试"; ?>
结果:
$i=0$j=1
$i=1$j=1
测试
goto语句
基本概念:通过goto语句可以将程序跳转指定的地方去执行
goto 标签;
标签;
语句;
快速入门:
goto a;
echo 'aa';
a:
echo 'bb';
运行结果:
bb
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