How to use php to modify the Chinese encoding format

In web development, Chinese encoding has always been a headache, and PHP development is no exception. It is often encountered that when you enter Chinese in a web form and then submit it to the server, you find that the Chinese is garbled. This problem is usually caused by different encoding methods. In PHP, we can solve the Chinese encoding problem through some methods. This article will introduce how to use PHP to change the Chinese encoding format.

1. Types of Chinese encoding methods

Before introducing how to change the Chinese encoding format, you need to first understand the types of Chinese encoding methods.

1. GBK/GB2312

GBK is the abbreviation of "Chinese Character Internal Code Extension Specification". It is China's national standard. It is an extension set of GB2312 and supports the world's Encoding of thousands of Chinese characters. GBK encoding supports Traditional Chinese, Simplified Chinese, Japanese, Korean and other languages.

2. UTF-8

UTF-8 is a universal multi-byte encoding technology that can encode Unicode with variable length. It can represent any character in the Unicode standard. , and backward compatible with ASCII.

2. Handling Chinese encoding issues in PHP

1. Get the encoding format of the data in the form

In getting the form Before extracting data, you need to determine how the data is encoded. You can determine the encoding method of the obtained data by using php's mb_detect_encoding function.

For example:

$encode = mb_detect_encoding($_POST['name'], array("ASCII","UTF-8","GB2312","GBK","BIG5"));

This function will detect whether the data is ASCII, UTF-8, GB2312, GBK, BIG5 encoding in turn. If it is detected that the encoding format of the data is UTF-8 , then UTF-8 encoding is returned.

2. Convert encoding format

After knowing the encoding format of the data, you need to convert it to the required encoding format. In php, there are two methods that can be used to convert the encoding format:

① mb_convert_encoding() :

$new_name = mb_convert_encoding($_POST['name'], 'UTF-8', 'auto');

Use the mb_convert_encoding() function to convert the data in $_POST['name'] into UTF-8 encoding and assigned to the new variable $new_name.

② iconv() :

$new_name = iconv($encode, "UTF-8", $_POST['name']);

Use iconv() function to convert the data in $_POST['name'] from $encode encoding to UTF-8 encoding, and assign it to New variable $new_name.

3. Practical application of Chinese encoding issues

In actual development, we often encounter situations where we need to convert Chinese data in the database.

For example, when reading Chinese data from the database, it is usually necessary to convert it to UTF-8 encoding:

mysql_query("SET NAMES 'UTF8'");
$result = mysql_query("SELECT * FROM `table`");
while($row = mysql_fetch_array($result)){
    $new_name = iconv("GB2312", "UTF-8", $row['name']); 
}

When writing Chinese data to the database, the data also needs to be Convert to the encoding method supported by the database:

mysql_query("SET NAMES 'GBK'");
$new_name = iconv("UTF-8", "GBK", $_POST['name']); 
mysql_query("INSERT INTO `table` (`name`) VALUES ('".$new_name."')");

When submitting form data, in order to avoid Chinese garbled characters, the data also needs to be encoded and converted:

$new_name = iconv("UTF-8", "GBK", $_POST['name']); 
mysql_query("INSERT INTO `table` (`name`) VALUES ('".$new_name."')");

4. Conclusion

Chinese encoding issues trouble many web developers. In PHP development, we can solve Chinese encoding problems through some methods. Understanding the types of Chinese encoding methods and mastering the methods of converting encoding formats in PHP can effectively solve Chinese encoding problems and ensure the normal display of Chinese content on the website.

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