Why Am I Getting a 'PDOException could not find driver' Error in My PHP Application?

Troubleshooting "PDOException could not find driver"

In your PHP application, you are encountering a "PDOException could not find driver" error when attempting to establish a database connection using PDO. The code in question is:

$dbh = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USER, DB_PASS);

You have verified that the database constants (DB_HOST, DB_NAME, DB_USER, and DB_PASS) are correctly defined. However, the error persists.

Root Cause:

This error indicates that the PDO extension for MySQL (pdo_mysql) is not installed or enabled in your PHP installation. PDO is an extension that provides a database abstraction layer, allowing you to connect to and interact with different database systems. For MySQL connectivity, you require the pdo_mysql extension.

Solution:

To resolve this issue, you need to install or enable the pdo_mysql PHP extension. The specific method for doing this will vary depending on your server configuration and the method used to install PHP.

Check PHPInfo:

You can check your PHP configuration via phpinfo() to verify if pdo_mysql is present and enabled:

1. Create a PHP file with the following code:

<?php phpinfo();
?>

2. Upload this file to your web server and access it in your browser.
3. Search for "PDO Drivers" in the phpinfo() output. If you see "pdo_mysql" listed, along with its client library version, it means pdo_mysql is installed.

If pdo_mysql is indeed installed, proceed to the following steps:

Enable PDO MySQL Extension (Linux)

For Linux systems, you may need to enable the pdo_mysql extension in your PHP configuration file:

1. Open the php.ini file (located in /etc/php5/apache2/php.ini or similar).
2. Find the line that says ";extension=pdo_mysql.so" and remove the semicolon at the beginning to uncomment it:

extension=pdo_mysql.so

3. Save the php.ini file and restart your web server (e.g., sudo service apache2 restart).

Enable PDO MySQL Extension (Windows)

On Windows systems, you can enable the pdo_mysql extension using:

1. Open the php.ini file (located in C:PHPphp.ini).
2. Find the line that says ";extension=php_pdo_mysql.dll" and remove the semicolon at the beginning to uncomment it:

extension=php_pdo_mysql.dll

3. Save the php.ini file and restart your web server (e.g., Apache as a service).

Verify the Installation:

Setelah membuat perubahan pada php.ini, periksa kembali keberadaan pdo_mysql di phpinfo() untuk memastikan bahwa itu telah diaktifkan dan berfungsi dengan benar.

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