Backend Development
PHP Tutorial
How to reverse Chinese strings in PHP to avoid garbled characters
How to reverse Chinese strings in PHP to avoid garbled characters
This article mainly introduces the method of realizing Chinese string reversal in PHP to avoid garbled characters. It has a certain reference value. Now I share it with you. Friends in need can refer to it
When the blogger was looking at PHP interview questions online today, he saw such a question, how to reverse a string. At that time, he thought there was a built-in function strrev. Can this function be implemented? I tried it later and found that this function can only reverse English characters, and will cause garbled characters in Chinese characters. The main reason is still a coding problem.
In PHP, utf-8 encoded Chinese is calculated as 3 bytes, and gb2312 is calculated as 2 bytes. Therefore, if you want to implement some functions of Chinese strings, you must first solve the encoding problem.
| 12345 |
is_string()//判断参数是否为字符串，这个大家应该都知道 mb_check_encoding()//用来检查给定的字符串是否属于指定的编码 mb_strlen()//用来获取字符串长度 mb_substr()//用来截取字符串中的字符 krsort()//将数组按键名由大到小排序上述 Copy after login |
Three functions starting with mb are used above. The functions starting with mb are used to process multi-byte strings, mainly to specify the string encoding.
mb_check_encoding() accepts two parameters. The first parameter should be a string, and the second parameter is to enter a Character encoding, and then determine whether the string belongs to this encoding, and return a bool value. If the second parameter is omitted, it defaults to the internal encoding, which can be viewed through mb_internal_encoding().
mb_strlen() has two parameters, the first is the string content, and the second is the encoding of the string.
mb_substr() has four parameters. The first is the content of the string to be intercepted, the second is the starting position of interception, and the third is The length of the interception, and the fourth is the encoding of the string (in this case, select utf-8, other encodings will not get the correct result).
The following is the complete code. The brief comments have been marked. In fact, just look at You can understand it in one go:
| ##12 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | <?php
header("Content-type:text/html;charset=utf-8");
$s="这是我的技术博客，欢迎多多来访！";
function str_rev($str){
//先判断参数是否为字符串，且为UTF8编码
if(!is_string($str)||!mb_check_encoding($str,"utf-8")){
die("输入的不是utf8类型的字符串");
}
//用mb_strlen函获取算utf8字符串的长度
$length=mb_strlen($str,"utf-8");
//声明一个数组备用
$arr=array();
//将字符串拆开放入数组
for($i=0;$i<$length;$i++){
$arr[$i]=mb_substr($str,$i,1,"utf-8");
}
//将数组按键名大小反转
krsort($arr);
//将数组中单个字符元素重新组合成字符串
$str=implode("",$arr);
//将翻转后的字符串返回
return $str;
}
echo $s."<br>";
echo str_rev($s);
/* 得到结果：
* 这是我的技术博客，欢迎多多来访！
* ！访来多多迎欢，客博术技的我是这
*/Copy after login
|
如果文中有任何错误，敬请指出，以便完善。
本文来自：http://5655237.blog.51cto.com/5645237/1258300
相关推荐：
The above is the detailed content of How to reverse Chinese strings in PHP to avoid garbled characters. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1673
14
1429
52
1333
25
1278
29
1257
24
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
