Solusi Call To Undefined Function Mysqli_connect

𝕸𝖆𝖘 𝕬𝖓𝖉𝖞 𝕯𝖎𝖌𝖎𝖙𝖆𝖑 𝕸𝖊𝖉𝖎𝖆

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May 10, 2025

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Solving the "Call to undefined function mysqli_connect()" Error in PHP

The dreaded "Call to undefined function mysqli_connect()" error is a common headache for PHP developers. This error signifies that PHP can't find the mysqli_connect() function, which is crucial for connecting to MySQL databases. Let's dive into why this happens and how to effectively fix it.

Understanding the Root Cause

This error typically arises from one of two primary reasons:

1. Missing MySQLi Extension

The most frequent culprit is the absence of the MySQLi extension in your PHP installation. The mysqli_connect() function is part of this extension, so without it, PHP simply doesn't know what to do with that command.

2. Incorrect PHP Configuration

Even if the MySQLi extension is installed, problems with your PHP configuration files (like php.ini) can prevent PHP from loading and using it.

Troubleshooting and Solutions

Let's tackle how to resolve this issue, starting with the most common solution:

1. Enabling the MySQLi Extension

This step depends heavily on your operating system and how PHP is installed. Here's a general guide, but you might need to adapt it based on your specific setup:

For Linux (using apt, yum, or similar package managers):

• Identify your PHP version: This is often crucial. You might have multiple PHP versions installed. Use commands like php -v or which php to determine the version you're working with.
• Install the extension: The command will vary slightly depending on your distribution (e.g., Debian/Ubuntu, CentOS/RHEL):
  • Debian/Ubuntu: sudo apt-get install php<version>-mysql (replace <version> with your PHP version, e.g., php8.1-mysql)
  • CentOS/RHEL: sudo yum install php<version>-mysql (replace <version> with your PHP version, e.g., php8.1-mysql)
• Restart your web server: After installation, restart Apache or Nginx (or your chosen web server) for the changes to take effect. Commands like sudo systemctl restart apache2 or sudo systemctl restart nginx are commonly used.

For Windows (using XAMPP, WAMP, or similar):

• Check your php.ini: Locate your php.ini file (its location varies depending on your installation). Usually, it's found in the PHP installation directory or the system32 directory.
• Uncomment the extension: Find the line extension=php_mysqli.dll (or a similar line) and remove the semicolon (;) at the beginning to uncomment it. Ensure the path to the DLL is correct if it's not in your default extensions directory.
• Restart your web server: Restart Apache (or your chosen web server) for changes to take effect.

For macOS (using Homebrew or similar):

• Install the extension: If you used Homebrew, try brew install php@<version>-mysql (replace <version> with your PHP version).
• Restart your web server: Restart your web server after the installation is complete.

2. Verifying PHP Configuration

Once the extension is installed, ensure it's correctly loaded in your PHP configuration:

• Check phpinfo(): Create a simple PHP file with <?php phpinfo(); ?> and access it through your web browser. Look for the "mysqli" section in the output. If it's present and shows that the extension is loaded, you've solved the problem. If not, revisit your php.ini file and make sure there are no errors in the configuration.

3. Restarting Your Web Server

After making any changes to your PHP configuration or installing extensions, always restart your web server. This ensures that the updated settings are loaded.

Prevention: Best Practices

• Use a reliable PHP installation method: Stick to official package managers or reputable installers. This minimizes the chances of encountering missing extensions or configuration issues.
• Regularly update PHP: Keeping your PHP installation updated ensures you have the latest security patches and features.
• Test thoroughly: Test your database connection code in a development environment before deploying to production.

By following these steps, you should be able to resolve the "Call to undefined function mysqli_connect()" error and get back to developing your PHP applications smoothly. Remember to consult the documentation for your specific operating system and PHP setup if you encounter any difficulties.