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How Can I Catch Fatal PHP Errors Using register_shutdown_function?
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
$content = <<<HTML
<table border="1">
<thead>
<th>Item</th>
<th>Description</th>
<thead>
<tbody>
<tr>
<td>Error</td>
<td><pre class="brush:php;toolbar:false">$errstr
$errno
$trace
To handle the mailing functionality, define the error_mail function and consider using a library like Swift Mailer.
Additional Resources:
- [PHP Error Handling](https://www.php.net/manual/en/features.error-handling.php)
- [$php_errormsg](https://www.php.net/manual/en/reserved.variables.php#constant.$php_errormsg)
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