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Can PHP Errors Be Written to a Database Instead of an Error Log File?
PHP errors are typically logged to the standard error_log file, but it may be desirable to have them stored in a database instead for easier tracking and analysis. While this is not directly possible without creating a custom error handler, it can be achieved with a single global change.
Implementing a Custom Error Handler
The key to controlling how errors are handled is to create a custom error handler. This can be done using the set_error_handler() function, which takes a callback function as its argument. The callback function should have the following signature:
function error_handler($errno, $errstr, $errfile, $errline) {}
Inside the callback function, you can determine how each error should be handled, including whether to log it to a database.
Example Error Logging to MySQL
The following code shows an example of a custom error handler that logs PHP errors to a MySQL database:
function myErrorHandler($errno, $errstr, $errfile, $errline) { // Establish connection to MySQL database $conn = mysqli_connect("hostname", "username", "password", "database"); // Prepare SQL query to log error $query = "INSERT INTO error_log (number, string, file, line) VALUES (?, ?, ?, ?)"; $stmt = mysqli_prepare($conn, $query); // Bind parameters to SQL query mysqli_stmt_bind_param($stmt, "isss", $errno, $errstr, $errfile, $errline); // Execute SQL query to log error mysqli_stmt_execute($stmt); // Close database connection mysqli_close($conn); // Don't execute PHP internal error handler return true; } // Set user-defined error handler $old_error_handler = set_error_handler("myErrorHandler");
After setting the user-defined error handler, all PHP errors will be routed through your custom error handling logic, including logging to the MySQL database.
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