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Application of break statement in PHP

巴扎黑
Release: 2023-03-04 12:08:01
Original
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一 实例

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>使用break关键字跳出多重循环</title>
<style type="text/css">
<!--
body {
background-color: #CCFF00;
}
-->
</style></head>
<body>
<?php
while(true){
for(;;){
for($i=1;$i<=4;$i++){
echo $i." <img  src=&#39;images/$i.jpg&#39; alt="Application of break statement in PHP" >"."\t";
if($i == 3){
echo "<p>变量\$i等于3,跳出一重循环。<p>";
break 1;
}
}
for($j = 1; $j < 5; $j++){
echo $j." <img  src=&#39;images/$j.jpg&#39; alt="Application of break statement in PHP" >"."\t";
if($j == 4){
echo "<p>变量\$j等于4,跳出最外重循环。";
break 3;
}
}
}
echo "看不到我吧,呵呵!";
}
?> 
</body>
</html>
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二 运行结果

Application of break statement in PHP

三 注意事项

本实例共3层循环,最外层的while循环和中间的for循环是无限循环,最里面并列两个for循环:程序首先执行第1个循环,循环3次,跳出当前循环(一重循环),然后继续执行第二个for循环,循环4次,然后跳出最外层的循环(体会break后的数字的含义,跳出针对自己的第3层循环)。


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