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php for 循环使用实例介绍,php实例

for 循环用于您预先知道脚本需要运行的次数的情况。

语法

for (初始值; 条件; 增量)
{
要执行的代码;
}

参数:

  • 初始值:主要是初始化一个变量值,用于设置一个计数器(但可以是任何在循环的开始被执行一次的代码)。
  • 条件:循环执行的限制条件。如果为 TRUE,则循环继续。如果为 FALSE,则循环结束。
  • 增量:主要用于递增计数器(但可以是任何在循环的结束被执行的代码)。

注释:上面的初始值增量参数可为空,或者有多个表达式(用逗号分隔)。

下面的实例定义一个初始值为 i=1 的循环。只要变量 i 小于或者等于 5,循环将继续运行。循环每运行一次,变量 i 就会递增 1:

<?php
for ($i=1; $i<=5; $i++)
{
echo "The number is " . $i . "<br>";
}
?>

输出:

The number is 1
The number is 2
The number is 3
The number is 4
The number is 5

 

原文地址:http://www.manongjc.com/php/php_while.html

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