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

Enable Error Reporting Globally

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);

Log Errors to a File

1

Set Error Logging

Add the following code:

ini_set('log_errors', 1);
ini_set('error_log', '/path/to/error.log'); // Replace with the desired path
error_reporting(E_ALL);
2

Verify Log File Permissions

Ensure that the directory and file specified in /path/to/error.log are writable by the web server.

chmod 666 /path/to/error.log
3

Check the Log

Open the log file to review errors:

cat /path/to/error.log

Debugging Specific to mysql.php

If you are debugging engine/classes/mysql.php, focus on the database connection and query execution.

1

Wrap Queries in Error Logging

Modify the query execution code in mysql.php to include error logging:

$result = mysqli_query($conn, $query);

if (!$result) {
    error_log("MySQL Query Error: " . mysqli_error($conn), 3, '/path/to/error.log');
    die("Error in SQL Query: " . mysqli_error($conn));
}
2

Log the Query

Ensure the query is logged for debugging:

error_log("Executing Query: " . $query, 3, '/path/to/error.log');

Use Try-Catch for Improved Error Handling

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());
}

Disable Error Reporting in Production

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

  1. Add this at the beginning of your scripts:
    2. ini_set('display_errors', 0);
    error_reporting(0);
  2. Keep logging enabled if necessary:
    3. 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.