PHP 循环 – For 循环
循环执行代码块指定的次数，或者当指定的条件为真时循环执行代码块。
for 循环
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 和 增量 参数可为空，或者有多个表达式（用逗号分隔）。
实例
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 " . $i . "<br>";
}
?>
输出：
The number is 1 The number is 2 The number is 3 The number is 4 The number is 5
foreach 循环
foreach 循环用于遍历数组。
语法
foreach ($array as $value)
{
要执行代码;
}
每进行一次循环，当前数组元素的值就会被赋值给 $value 变量（ 数组指针 会逐一地移动），在进行下一次循环时，您将看到数组中的下一个值。
实例
下面的实例演示了一个输出给定数组的值的循环：
<?php
$x=array("one","two","three");
foreach ($x as $value)
{
echo $value . "<br>";
}
?>
输出：
one two three
笔记
使用 for循环 ，实现 冒泡排序 ：
<?php
$arr = array(5,3,6,2,8,10);
for($i = count($arr)-1;$i>=0;$i--){
for($j = 0 ; $j < $i ; $j++){
if($arr[$j+1] > $arr[$j] ){
$aa = $arr[$j+1];
$arr[$j+1] = $arr[$j];
$arr[$j] = $aa;
}
}
}
print_r($arr);
?>
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