Solusi Call To Undefined Function Mysqli_init In Codeigniter

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Apr 02, 2025

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The Complete Guide to Solving "Call to undefined function mysqli_init()" in CodeIgniter

The dreaded "Call to undefined function mysqli_init()" error in CodeIgniter can be frustrating, but it's usually a simple fix. This comprehensive guide will walk you through the most common causes and provide clear solutions to get your CodeIgniter application running smoothly.

Understanding the Error

The error message "Call to undefined function mysqli_init()" indicates that PHP cannot find the mysqli_init() function. This function is part of the MySQLi extension, which is used for interacting with MySQL databases. The absence of this function means that the MySQLi extension isn't enabled on your server.

Common Causes and Solutions

Here's a breakdown of the most common reasons you might encounter this error and how to address them:

1. Missing MySQLi Extension: This is the most frequent cause. The MySQLi extension needs to be enabled on your server. You don't do this within your CodeIgniter code; it's a server-side configuration.

• Solution: Access your server's configuration (typically through php.ini or a control panel like cPanel). Look for the line that says extension=mysqli (or extension=php_mysqli). Ensure this line is uncommented (not preceded by a semicolon); if it's missing, add it. After making changes, restart your web server to apply the modifications.

2. Incorrect PHP Version: Older PHP versions might not have the MySQLi extension enabled by default, or it might have a different name.

• Solution: Check your PHP version and ensure it's compatible with the MySQLi extension. Consult the PHP documentation for your specific version. You might need to install the MySQLi extension separately using your system's package manager (e.g., apt-get, yum, or brew).

3. Database Configuration Issues in CodeIgniter: Even with the MySQLi extension enabled, a misconfiguration within your CodeIgniter database settings can lead to this error.

• Solution: Double-check your database.php configuration file (located in application/config/). Verify that:
  • The correct database driver is set to mysqli.
  • Your database credentials (hostname, username, password, database name) are accurate.
  • The file path is correct. A common mistake is to edit the wrong database.php file.

4. Incorrect File Permissions: In rare cases, incorrect file permissions can prevent CodeIgniter from accessing necessary files or libraries.

• Solution: Ensure that the CodeIgniter application and its associated files and folders have the appropriate read and execute permissions. The precise permissions might vary depending on your server's configuration, but 755 for directories and 644 for files are a good starting point. Consult your server's documentation for more information.

Preventing Future Issues

To avoid encountering this error again, follow these best practices:

• Regularly Update PHP: Keeping your PHP version up-to-date ensures you have access to the latest features and security patches, including the MySQLi extension.
• Test Database Connections: Before deploying your CodeIgniter application, rigorously test your database connection to catch configuration errors early.
• Use Version Control: Employ a version control system (like Git) to track changes to your code and configuration files, simplifying troubleshooting.

By carefully reviewing these steps, you should be able to resolve the "Call to undefined function mysqli_init()" error in CodeIgniter effectively. Remember to restart your web server after making any changes to your server's configuration files. If you still encounter problems, carefully double-check each step, and consult your server's documentation or seek assistance from your hosting provider.