Ensuring "UTF-8 All the Way Through" for a New Linux Server
When setting up a new server to fully support UTF-8 in a web application, it's crucial to configure the necessary settings in Apache, MySQL, and PHP. A detailed checklist can help ensure a comprehensive implementation:
Data Storage in MySQL:
- Specify the 'utf8mb4' character set on all tables and text columns to store values in native UTF-8 encoding.
- Ensure that MySQL is using utf8mb4_ or other utf8mb4_* collations for automatic UTF-8 encoding.
Data Access in PHP:
- Set the connection charset to 'utf8mb4' in the application's database connection method.
- Utilize the native connection character set configuration mechanisms provided by database drivers (e.g., PDO, mysqli).
Output Encoding:
- Include 'Content-Type: text/html; charset=utf-8' in the HTTP header to specify the output encoding.
- Use the JSON_UNESCAPED_UNICODE parameter with json_encode() to encode output strings as UTF-8.
Input Handling:
- Use PHP's mb_check_encoding() function to verify the UTF-8 validity of received strings.
- Ensure that all files served (PHP, HTML, etc.) are encoded in valid UTF-8.
Other Considerations for Code:
- Utilize the mbstring extension for безопасные UTF-8 operations.
- Familiarize oneself with UTF-8 encoding principles to avoid potential issues.
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