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php for 循环使用的简单实例,phpfor循环实例
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php for 循环使用的简单实例,phpfor循环实例

Jun 13, 2016 am 08:38 AM
for for loop php cycle

php for 循环使用的简单实例,phpfor循环实例

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; 
} 
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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:上面的初始值和增量参数可为空,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:

<&#63;php 
for ($i=1; $i<=5; $i++) 
{ 
echo "The number is " . $i . "<br>"; 
} 
&#63;> 
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输出:

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