php学习之旅 (5) 循环

php学习之旅 (5) 循环
1、语法

while - 循环直到特定条件满足
do...while - 执行一次代码，并且循环，直到满足特定条件
for - 循环指定的次数
foreach - 对数组中的每个元素都循环一遍

2、while

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

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

3、do...while

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

输出
The number is 2
The number is 3
The number is 4
The number is 5
The number is 6

4、for

<?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

5、foreach

<?php
$x=array("one","two","three");
foreach ($x as $value)
{
   echo $value . "<br />";
}
?>

输出
one

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