How to solve the problem of Chinese garbled characters submitted in php form

In web development, we often need to process data submitted by forms, but when using PHP to process form submissions, we will encounter Chinese garbled problems. This is because in the HTTP protocol, the characters transmitted are URL-encoded, and by default, the data submitted by the form is transmitted in the ISO-8859-1 encoding format, which is incompatible with the Chinese character set, so it There will be problems with Chinese garbled characters.

In order to solve this problem, we need to process the form data in PHP code. This article will introduce several methods to deal with the problem of Chinese garbled characters in form submission.

1. Set the form encoding format

When writing an HTML form, we can specify the encoding format of the form by setting the enctype attribute of the form form. There are two most common encoding formats: application/x-www-form-urlencoded and multipart/form-data. Among them, application/x-www-form-urlencoded is the default encoding format, which encodes data into readable ASCII characters and is suitable for most situations. Multipart/form-data is suitable for uploading files and other situations. In addition, there is a text/plain encoding format, which does not perform any encoding processing on the data and is suitable for plain text data.

We can use the following code to set the encoding format of the form:

<form action="process.php" method="post" enctype="application/x-www-form-urlencoded">
    <input type="text" name="username">
    <input type="submit" value="Submit">
</form>

2. Set the PHP page encoding format

In the PHP code, we need to use the header function to Set the page encoding format, otherwise garbled characters may appear when outputting HTML code. We can use the following code to set the page encoding format to UTF-8:

header("Content-type:text/html;charset=utf-8");

3. Use the iconv function to convert the encoding

If the data submitted by the form is still garbled, we can use the iconv function Convert data to the specified character set.

$str = $_POST["username"];
$str = iconv("gb2312", "utf-8//IGNORE", $str); //将gb2312编码的字符串转换为utf-8

Among them, gb2312 is a common Chinese character set and utf-8 is a universal character set. We can also use other character sets for conversion.

4. Use the mb_convert_encoding function to convert the encoding

The mb_convert_encoding function can also convert a string from one character set to another.

$str = $_POST["username"];
$str = mb_convert_encoding($str, "utf-8", "gb2312"); //将gb2312编码的字符串转换为utf-8

5. Set the PHP.ini file

Finally, we can also set the default character set in the PHP configuration file php.ini.

default_charset = "utf-8"

In this way, there is no need to set the page encoding format in the PHP code.

Summary

To deal with the problem of Chinese garbled characters in form submission, we can take the following measures:

• Set the form encoding format
• Set the PHP page encoding format
• Use iconv function to convert encoding
• Use mb_convert_encoding function to convert encoding
• Set PHP.ini file

The above methods are just common processing method, in fact there are many other processing methods. During the development process, we need to choose the most appropriate method to solve the Chinese garbled problem according to the specific situation.

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