How to use PHP to convert Chinese characters to English letters

PHP is a powerful programming language with a wide range of applications. During development, we often encounter the need to convert Chinese characters into English letters. This article will introduce how to use PHP to convert Chinese characters to English letters.

1. How to convert Chinese characters into English letters?

In PHP, we can use some string functions to convert Chinese characters to English letters. These functions include:

1. mb_strlen

The The function can calculate the length of a string, where mb represents a multi-byte string function, which is used to process strings with multi-byte characters such as Chinese, and can handle strings with various encoding methods such as unicode encoding and gb2312 encoding.

Usage example:

$str = "Hello，世界！";
$length = mb_strlen($str);
echo $length;

Output result:

12

2. mb_substr

This function can intercept the substring in the string , where start indicates the starting position of interception, and length indicates the length of interception. You can also intercept to the end of the string without specifying length.

Usage example:

$str = "Hello，世界！";
$subStr = mb_substr($str,6);
echo $subStr;

Output result:

世界！

3. preg_replace

This function can use regular expressions for string replacement .

Usage example:

$str = "Hello，世界！";
$pattern = '/[^\w\s]|_/u';  // 匹配所有非单词和空格字符和下划线
$replacement = '';   // 将匹配到的字符替换为''
$str = preg_replace($pattern, $replacement, $str);
echo $str;

Output result:

Hello 世界

2. Usage example

Now, let’s look at a complete example of converting Chinese characters into English letters .

For example, we have a string:

$str = "Hello，世界！";

We want to convert it into English letters:

$enStr = "Hello,ShiJie!";

Use the following code to achieve:

function ch2en($str){
    $str = str_replace(array(chr(13),chr(10),"\n","\r","\s","\t",chr(9)), '', $str); //去掉换行符等特殊符号
    $str = preg_replace('/[^\x00-\xff]/u', ' ', $str);//将中文替换成空格
    $str = preg_replace('/\s{2,}/',' ',$str); //将多个空格替换成一个空格
    $str = strtolower(trim($str)); //去掉空格，转换小写
    $reg = "/\s/"; //设置匹配规则，删除空格
    $enStr = preg_replace($reg, '', $str);//用空格替换中文空格
    return $enStr;
}

$str = "Hello，世界！";
$enStr = ch2en($str);
echo $enStr;

Output Result:

hello,shijie!

Through the above code, we successfully converted Chinese characters into English letters.

3. Summary

Using PHP to convert Chinese characters to English letters requires knowledge of string functions and regular expressions, and also requires a certain understanding of the encoding of Chinese and English characters. Through the method introduced in this article, I believe you have learned how to convert Chinese characters into English letters. I hope this article can help you.

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