How to reverse output string in PHP? This article will introduce to you how PHP uses recursive calls to reversely output strings. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
First of all, let’s understand what is a recursive call?
Recursive call: A function calls itself or calls itself again after calling other functions. To put it simply: it calls itself. Recursive calling is a solution and a logical idea, which can divide a large job into gradually smaller tasks. Let's introduceHow PHP uses recursive calls to reversely output a string?.
Code example:
<?php
header("content-type:text/html;charset=utf-8");
// 反向输出字符串
//使用递归的字符串
// 通过反向输出的字符串
function reverse($str)
{
if (($str == null) ||
(strlen($str) <= 1))
echo ($str);
else
{
echo ($str[strlen($str) - 1]);
reverse(substr($str, 0,
(strlen($str) - 1)));
}
}
// 程序代码
$str = "hello";
echo ($str);
echo ("\n反向输出：\n");
reverse($str);
?>
php tutorial!
The above is the detailed content of How to reverse output string in PHP? Use recursive call output. For more information, please follow other related articles on the PHP Chinese website!
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
