How Can I Catch Fatal PHP Errors Using register_shutdown_function?

Catching PHP Fatal Errors Through Registering a Shutdown Function

Problem:
While set_error_handler() can handle most PHP errors, it fails to capture fatal errors (E_ERROR), such as those caused by calling nonexistent functions.

Solution:
PHP 5.2 introduces the register_shutdown_function, which allows you to log fatal errors:

register_shutdown_function("fatal_handler");

function fatal_handler() {
    // Capture error information
    $error = error_get_last();
    if ($error) {
        error_mail(format_error(
            $error["type"], $error["message"], $error["file"], $error["line"]
        ));
    }
}

Define the format_error function to format the error information:

function format_error($errno, $errstr, $errfile, $errline) {
    // Generate the error trace
    $trace = print_r(debug_backtrace(false), true);
    
    // Format the error information
    $content = 
        <thead>
            <th>Item</th>
            <th>Description</th>
        <thead>
        </thead>
</thead><tbody>
            <tr>
                <td>Error</td>
                <td><pre class="brush:php;toolbar:false">$errstr

Errno

$errno

File $errfile Line $errline Trace

$trace

HTML; return $content; }

To handle the mailing functionality, define the error_mail function and consider using a library like Swift Mailer.

Additional Resources:

• [PHP Error Handling](https://www.php.net/manual/en/features.error-handling.php)
• [$php_errormsg](https://www.php.net/manual/en/reserved.variables.php#constant.$php_errormsg)

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