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Detailed graphic and text explanation of PHP process control statement expansion

伊谢尔伦
Release: 2023-03-11 06:28:02
Original
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 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;$i++){
echo &#39;$i=&#39;.$i."<br/>";
if($i==10){
break;
}
}
?>;
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Detailed graphic and text explanation of PHP process control statement expansion

Detailed graphic and text explanation of PHP process control statement expansion

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($i){
case 5:
echo "quit at 5<br/>";
break;
case 10:
echo "quit at 10<br/>";
break 2;
default:
break;
}
}
echo &#39;$i=&#39;.$i;
?>
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图解:

Detailed graphic and text explanation of PHP process control statement expansion

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

循环控制语句continue

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 &#39;$i=&#39;.$i."<br/>";
}
echo "hello";
?>
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图解:

Detailed graphic and text explanation of PHP process control statement expansion

Detailed graphic and text explanation of PHP process control statement expansion

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($j==2){
continue 2;
}
echo &#39;$i=&#39;.$i.&#39;$j=&#39;.$j."<br/>";
}
}
echo "测试";
?>
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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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