How to deal with common problems in converting Chinese characters to UTF-8 encoding in PHP development

How to deal with the common problem of converting Chinese characters to UTF-8 encoding in PHP development

In PHP development, dealing with the conversion of Chinese characters to UTF-8 encoding is a very common problem . Since Chinese characters are multi-byte encodings, if a string is mixed with different encodings, garbled characters may sometimes appear or Chinese characters may not be displayed correctly. When dealing with these problems, we can take some methods to ensure that Chinese characters can be correctly converted to UTF-8 encoding. Here are some common problems and solutions, along with code examples.

Problem 1: Garbled Chinese characters stored in the database

When Chinese information is stored in the database, garbled characters often appear. This is because the encoding method of the database is inconsistent with the encoding method of the PHP script, causing encoding conversion problems when data is stored and read. In order to solve this problem, we can ensure that the data is stored and read correctly in UTF-8 encoding by setting the character set when connecting to the database.

Specific code example:

// 连接数据库时设置字符集为utf8
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
$conn->set_charset("utf8");

In the above example, we set the character set of the database connection to UTF through $conn->set_charset("utf8") -8, ensures that the data is processed in UTF-8 encoding when stored and read.

Problem 2: Chinese characters obtained from the HTML form are displayed as garbled characters

When Chinese characters are obtained from the HTML form, if they are not encoded, garbled characters may occur. In PHP, we can use the mb_convert_encoding function to convert the obtained Chinese characters into UTF-8 encoding to ensure that the characters can be displayed correctly.

Specific code example:

// 从HTML表单中获取中文字符
$chinese = $_POST['chinese'];

// 将中文字符转换为UTF-8编码
$utf8_chinese = mb_convert_encoding($chinese, "UTF-8", "auto");

In the above example, we use the mb_convert_encoding function to convert the Chinese characters obtained from the HTML form into UTF-8 encoding, thus Make sure characters are displayed correctly.

Problem 3: Inaccurate processing of Chinese character lengths in strings

When processing string lengths, the length of Chinese characters is different from English characters because Chinese characters are multi-byte encoded. If Chinese characters are not treated specially, it may lead to inaccurate string length calculation. In PHP, we can use the mb_strlen function to get the byte length of the string to correctly calculate the length of Chinese characters.

Specific code example:

// 原始字符串
$str = "你好，Hello";

// 获取字符串的字节长度
$len = mb_strlen($str, 'UTF-8');

In the above example, we obtained the byte length of the string $str through the mb_strlen function, ensuring The length calculation of Chinese characters is accurate. This way there will be no bias when dealing with string lengths.

To sum up, the common problems of converting Chinese characters to UTF-8 encoding need to be paid attention to in PHP development. By properly setting the database connection character set, converting the obtained Chinese character encoding, and correctly calculating the length of Chinese characters, we can effectively avoid the trouble caused by Chinese character encoding problems and ensure that Chinese characters can be displayed and processed correctly. We hope that the code examples provided above can help developers better handle related issues and improve development efficiency and user experience.

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