PHP 中的循环语句用于执行相同的代码块指定的次数。
循环
在您编写代码时，您经常需要让相同的代码块运行很多次。您可以在代码中使用循环语句来完成这个任务。
在 PHP 中，我们可以使用下列循环语句：
while 只要指定的条件成立，则循环执行代码块 do...while 首先执行一次代码块，然后在指定的条件成立时重复这个循环 for 循环执行代码块指定的次数 foreach 根据数组中每个元素来循环代码块while 语句
只要指定的条件成立，while 语句将重复执行代码块。
语法while (condition)code to be executed;例子
下面的例子示范了一个循环，只要变量 i 小于或等于 5，代码就会一直循环执行下去。循环每循环一次，变量就会递增 1：
<html><body><?php $i=1;while($i<=5) { echo "The number is " . $i . "<br />"; $i++; }?></body></html> do...while 语句
do...while 语句会至少执行一次代码 - 然后，只要条件成立，就会重复进行循环。
语法do{code to be executed;}while (condition); 例子 下面的例子将对 i 的值进行一次累加，然后，只要 i 小于 5 的条件成立，就会继续累加下去：
<html><body><?php $i=0;do { $i++; echo "The number is " . $i . "<br />"; }while ($i<5);?></body></html> for 语句
如果您已经确定了代码块的重复执行次数，则可以使用 for 语句。
语法for (initialization; condition; increment){ code to be executed;} 注释：for 语句有三个参数。第一个参数初始化变量，第二个参数保存条件，第三个参数包含执行循环所需的增量。如果 initialization 或 increment 参数中包括了多个变量，需要用逗号进行分隔。而条件必须计算为 true 或者 false。
例子下面的例子会把文本 "Hello World!" 显示 5 次：
<html><body><?phpfor ($i=1; $i<=5; $i++){ echo "Hello World!<br />";}?></body></html> foreach 语句
foreach 语句用于循环遍历数组。
每进行一次循环，当前数组元素的值就会被赋值给 value 变量（数组指针会逐一地移动） - 以此类推。
语法foreach (array as value){ code to be executed;} 例子 下面的例子示范了一个循环，这个循环可以输出给定数组的值：
<html><body><?php$arr=array("one", "two", "three");foreach ($arr as $value){ echo "Value: " . $value . "<br />";}?></body></html> 
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