Troubleshooting Class 'mysqli' Not Found in PHP

Discover solutions for resolving the "Class 'mysqli' not found" error in PHP, even after compiling with the mysqli extension.
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Troubleshooting Class 'mysqli' Not Found in PHP

Encountering the dreaded Class 'mysqli' not found error can be frustrating, especially when you believe you've correctly compiled PHP with the mysqli extension. Let's explore some possible reasons and solutions to resolve this issue.

Verify mysqli Extension

First, ensure that PHP is indeed compiled with the mysqli extension. You can do this by creating a PHP file with the following content:

[[See Video to Reveal this Text or Code Snippet]]

Open this file in your web browser. Look for a section titled 'mysqli'. If it’s not there, then the extension is not loaded.

Check PHP Configuration

Ensure that your php.ini file includes the following line:

[[See Video to Reveal this Text or Code Snippet]]

If you make any changes, restart your web server.

Confirm Correct PHP Version

If you're running multiple PHP versions, you might be editing the wrong php.ini file. Verify which configuration file is being used by reviewing the Loaded Configuration File entry in the phpinfo() output mentioned earlier.

Ensure that the version of PHP running on your Apache server is compiled with the mysqli extension. If you have PHP running in different environments (like CLI and Apache), double-check that the Apache version is properly configured.

Restart the Web Server

After making changes to the php.ini file or recompiling PHP, you should restart your web server to apply these changes. For example:

For Apache: sudo service apache2 restart or sudo systemctl restart apache2

For Nginx: sudo service nginx restart or sudo systemctl restart nginx

Check for Dependency Issues

Sometimes, the mysqli extension may depend on other libraries. Ensure all required libraries are installed.

For Linux, a common command to install missing libraries is:

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Or, for specific versions:

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Validate Installation Commands

If you've compiled PHP manually, double-check the commands used. Here is an example sequence to compile with mysqli support:

[[See Video to Reveal this Text or Code Snippet]]

Ensure to follow any additional steps specified for your operating system.

Summary

Resolving the Class 'mysqli' not found error typically involves verifying the correct compilation and configuration of PHP with the mysqli extension. By following the steps outlined above, you should be able to identify and fix the issue. If problems persist, consider consulting PHP and Apache error logs for more detailed information.

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