Solution to PHP Fatal error: Class 'PDO' not found

In web development, using PHP and MySQL is a very common combination. However, during development, you may encounter an error “PHP Fatal error: Class ‘PDO’ not found”, which is usually caused by the lack of PDO extension in the PHP environment.

In this article, we will explain how to solve this common error.

1. Install the PDO extension

First, you need to make sure you have the PDO extension installed. You can install it in several ways.

The first is to enable PDO extension. In the vast majority of cases, this extension is already installed by PHP and just needs to be uncommented. You can find the php.ini file and find the following lines:

;extension=pdo_mysql
;extension=pdo_sqlite
;extension=pdo_pgsql
;extension=pdo_oci
;extension =pdo_dblib
;extension=pdo_firebird

Please remove the semicolon at the beginning of the previous comment; if there are no such lines, please add them manually. Then restart PHP and the web server.

The second is to manually compile PHP. If you did not explicitly enable PDO support when compiling and installing PHP, you need to recompile PHP and specify support for PDO when compiling. This step needs to be adjusted according to your compilation environment and system version.

2. Check PHP version

If you have installed the PDO extension and are still encountering this error, then please check your PHP version. You need PHP 5.1.0 or higher to use PDO. You can check your PHP version by entering the following command at the command line:

php -v

If your PHP version is earlier than 5.1.0, you need to upgrade PHP.

3. Check PHP configuration

In some cases, your PHP configuration may be incompatible with the PDO extension. Please ensure the following:

• The PDO extension is enabled in the PHP configuration file (php.ini).
• Loaded the correct php.ini file from the PHP application.
• You have correctly set the PDO configuration options in the php.ini file.
• You are using the correct version of PHP that is compatible with your php.ini file.

4. Using other database extensions

Finally, if you cannot solve the PDO extension problem, you can try using other database extensions. In PHP, there are many other extensions available, such as mysqli, which is compatible with MySQL.

To use the mysqli extension, you need to change your PHP code to use mysqli functions instead of PDO functions. It should be noted that there are slight differences between mysqli and PDO and require slight adjustment.

Summary

In this article, we introduced ways to solve the common error “PHP Fatal error: Class ‘PDO’ not found”. It is important to note that checking PHP configuration and PDO extension compatibility is key to solving this problem. If none of the above resolves the issue, you can try using other database extensions.

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