Why is my PHP code throwing a \'PHP Fatal error: Class \'PDO\' Not Found\' despite PDO seemingly being enabled?

PHP Fatal Error: Class 'PDO' Not Found

In PHP development, encountering the "PHP Fatal error: Class 'PDO' not found" can be frustrating. This error signifies that the PHP Data Objects (PDO) class is missing from your environment, preventing you from establishing database connections and performing database operations.

The provided PHP INFO and PHP INI configurations indicate that PDO is enabled and its drivers are present. However, there seems to be a discrepancy between the installed extensions and the code that attempts to access the PDO class.

Possible Causes:

Incorrect PHP Version:
Ensure you are using a PHP version that supports PDO. In this case, PHP 5.3.15 is being used, which does support PDO.

Missing PDO extensions:
Verify that both the pdo.so and pdo_mysql.so extensions are installed and loaded. The PHP INFO shows that they are enabled, but it's always prudent to double-check.

Insufficient Permissions:
Make sure that the PHP user has sufficient permissions to access the pdo.so and pdo_mysql.so extensions.

Code Issue:
The code snippet provided attempts to check if the MySQL extension is installed. However, it uses the PDO::getAvailableDrivers() method, which is a PHP 5.4 feature. In PHP 5.3, you should use the PDO::__construct() method instead.

Solution:

To resolve this issue, you can try the following:

1. Update your code: Use the PDO::__construct() method to check for the MySQL extension, as it is compatible with PHP 5.3.15.
2. Reinstall PHP: This will ensure that the PDO extensions are properly installed and loaded.
3. Restart your web server: This step is necessary for any changes to be applied.

Additional Tips:

• Use a PHP version that supports PDO (>= PHP 5.1)
• Ensure that both pdo.so and pdo_mysql.so extensions are installed
• Grant sufficient permissions to the PHP user
• Check for any syntax errors or version compatibility issues in your code

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