Enable PHP Error Reporting for engine/classes/mysql.php Troubleshooting

To enable PHP error reporting in the context of troubleshooting the engine/classes/mysql.php file, follow these steps.

For closely related PHP debug / runtime topics, see assert_quiet_eval in PHP — Explanation & Troubleshooting, vqmod::bootup — PHP domdocument, and How to Update PHP Memory Limit for Magento 2.

Add the following code at the beginning of the mysql.php file, or preferably at the top of the script that includes mysql.php:

// Enable error reporting

ini_set('display_errors', 1);

ini_set('display_startup_errors', 1);

error_reporting(E_ALL);

If your mysql.php file uses PDO for database interactions, you can implement try-catch blocks for better error handling:

try {

    $pdo = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);

    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);



    $stmt = $pdo->prepare($query);

    $stmt->execute();



    echo "Query executed successfully!";

} catch (PDOException $e) {

    error_log("PDO Error: " . $e->getMessage(), 3, '/path/to/error.log');

    die("Database Error: " . $e->getMessage());

}

After resolving the issue, disable error reporting in production to avoid exposing sensitive information:

1. Add this at the beginning of your scripts:

ini_set('display_errors', 0);

error_reporting(0);

2. Keep logging enabled if necessary:

ini_set('log_errors', 1);

ini_set('error_log', '/path/to/error.log');

• Enable error reporting with ini_set() to see all errors and warnings.
• Use logging to capture errors without exposing sensitive information to users.
• Add debugging code around the database connection and query execution in mysql.php.
• Once resolved, disable error display in production for security.