What should I do if the Chinese input content is not displayed in php?

If you are a PHP developer, you may encounter a common problem: when you try to get Chinese content input from an HTML form, it may not display properly in your PHP script. Not only does this situation confuse you, but it can severely impact your application's functionality. In this article, we will clearly explain why this problem occurs and how to solve it.

Why can’t Chinese be displayed?

In PHP, HTTP request parameters and data sent from HTML forms are received by the $_GET and $_POST arrays. When these parameters contain Chinese characters, they may not be decoded properly. This is because Chinese characters usually require multiple bytes to represent, and they need to be decoded using a special character set.

By default, PHP will use the ASCII character set to decode URL parameters, but the ASCII character set does not support Chinese character sets. Additionally, when you get data from a form, PHP will decode it using the character set specified when the form was submitted. If the character set is incorrect, Chinese characters may not be parsed correctly and therefore not displayed properly in your script.

Solution

To resolve this issue, you can take the following steps:

1. Specify the correct character set in the form:

If you are using HTML, you can insert the following code into the form:

<meta charset="utf-8">

This will specify the character set to use when the form is submitted. Please ensure that the specified character set is consistent with your application encoding, otherwise decoding errors may result.

2. Use the correct character set in PHP scripts:

In PHP, you can use the mb_convert_encoding() function to convert the received data from the specified character set Code your application. For example, if you are using UTF-8, you can use the following code to convert the received data to UTF-8 encoding:

$text = $_POST['text'];
$text = mb_convert_encoding($text, "UTF-8", "auto");
echo $text;

The second parameter is the target character set and the third parameter is the source character set . Here, we use "auto" as the source character set so that the mb_convert_encoding() function automatically detects the source character set.

3. When working with Chinese characters, use the correct functions:

When dealing with Chinese strings, you need to use the appropriate string functions. For example, if you need to get the length of a string, you should use the mb_strlen() function instead of the strlen() function.

The following is an example:

$text = "你好，世界！";
echo strlen($text); // 输出 15
echo mb_strlen($text, "UTF-8"); // 输出 7

In this example, we use the strlen() function and mb_strlen() function to get the length of the string. Since Chinese characters require more bytes to represent, the strlen() function outputs the wrong string length, while the mb_strlen() function outputs the correct string length.

Conclusion

It is very important to correctly handle Chinese characters in PHP. If your application needs to work with Chinese characters, you need to ensure that you use the correct character set and decode these characters correctly. By using the correct functions to handle Chinese characters, you will be able to avoid many common problems and will be able to write more efficient and powerful applications.

The above is the detailed content of What should I do if the Chinese input content is not displayed in php?. For more information, please follow other related articles on the PHP Chinese website!