Why Am I Getting a \'Class \'PDO\' Not Found\' Error in PHP?

Diagnosing "Class 'PDO' Not Found" Error in PHP

When attempting to utilize the PDO library in a PHP script, an error message can potentially arise: "PHP Fatal error: Class 'PDO' not found." This error indicates that the PHP Data Objects (PDO) extension, which facilitates communication with various database systems, is not installed or loaded.

Determining Possible Causes:

To troubleshoot this issue, several factors should be considered:

• Availability of PDO Extension: Verify that the PDO extension is installed and enabled in the PHP configuration file (e.g., php.ini). The following snippet should be present in the file:

  extension=pdo.so
  extension=pdo_mysql.so

• Compatibility: Ensure that the installed PDO extension is compatible with the PHP version being used.
• Database Driver: Confirm that the appropriate database driver for the desired database type is installed and enabled.

Proposed Solution:

Based on the provided error message and system setup, the probable cause of the error is the lack of the PHP MySQL driver. To resolve this issue, follow these steps:

1. Install PDO MySQL Driver: Execute the following commands to install the driver:

   yum install php-pdo
   yum install php-pdo_mysql

2. Restart Web Server: Restart the Apache web server to apply the changes:

   service httpd restart

After completing these steps, the PDO extension and MySQL driver should be installed and available. Refreshing the problematic PHP script should now yield successful execution.

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