How to remove Chinese characters in php and convert them to URL format

In many PHP projects, Chinese characters often appear in strings. However, using Chinese characters in a URL, for example, can cause errors, so these characters usually need to be converted into a format acceptable to the URL. This article will describe how to use PHP to strip Chinese characters and convert them into an acceptable URL format.

1. How to remove Chinese characters in PHP

1. Use regular expressions

Regular expression is a method that can be used to match and manipulate text Tool of. In PHP, you can use the preg_replace() function with a regular expression to replace matched text.

The following example demonstrates how to use regular expressions to remove Chinese characters in a string:

$str = 'Hello, 世界！';
$str = preg_replace('/[\x{4e00}-\x{9fa5}]+/u', '', $str);
echo $str; // 输出：Hello, ！

In this example, Unicode regular expressions are used to match all Chinese characters in the string character. In the Unicode regular expression, \x{4e00} represents the character encoded by Unicode as U 4E00, which is the first character of the Chinese character, \x{9fa5} represents the character whose Unicode encoding is U 9FA5, which is the last character of Chinese characters.

in the regular expression represents one or more characters, and the u parameter represents using the Unicode character set for matching.

2. Using mb_ereg_replace()

mb_ereg_replace() is one of the PHP built-in functions for regular expression replacement based on multi-byte characters. Use this function to remove Chinese characters from a string.

The following code demonstrates how mb_ereg_replace() removes Chinese characters from a string:

$str = 'Hello, 世界！';
$str = mb_ereg_replace('[\x{4e00}-\x{9fa5}]', '', $str);
echo $str; // 输出：Hello, ！

In this example, the Unicode character set is used to match Chinese characters and replace them with null String.

2. Convert Chinese characters into a URL-acceptable format

In many applications, it is necessary to convert Chinese characters into a URL-acceptable format. Only certain characters can be included in the URL, such as letters, numbers, and some special characters. In order for the URL to work correctly, the Chinese characters in the URL need to be converted to special characters.

There are many ways to convert Chinese characters into a format acceptable to the URL. One of the more common methods is to convert Chinese characters into UTF-8 encoding and use the urlencode() function to encode it. .

The following code demonstrates how to use PHP to convert Chinese characters to UTF-8 encoding and perform URL encoding:

$str = '你好，世界！';
$str = urlencode($str);
echo $str; // 输出：%E4%BD%A0%E5%A5%BD%EF%BC%8C%E4%B8%96%E7%95%8C%EF%BC%81

In this example, the urlencode() function will The string is converted to UTF-8 encoding and URL encoded. When using an encoded string as part of a URL, the URL is guaranteed to work correctly.

3. Conclusion

In PHP projects, you need to pay attention to handling Chinese characters. Chinese characters can be easily removed from a string using regular expressions or the built-in function mb_ereg_replace(). When converting Chinese characters into a format acceptable for a URL, you can convert them to UTF-8 encoding and use the urlencode() function to encode them. These tips can ensure that PHP applications can handle Chinese characters properly and avoid errors and exceptions caused by Chinese characters.

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