How Can I Catch and Handle Fatal PHP Errors (E_ERROR) Using `register_shutdown

How Can I Catch and Handle Fatal PHP Errors (E_ERROR) Using `register_shutdown_function()`?

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Release： 2024-12-29 08:02:17

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How Can I Catch and Handle Fatal PHP Errors (E_ERROR) Using `register_shutdown_function()`?

Catching Fatal (E_ERROR) PHP Errors

Problem:

Although the set_error_handler() function is effective for capturing most PHP errors, it fails to handle fatal errors, such as calling nonexistent functions. This leaves developers seeking alternative methods for capturing these critical errors.

Solution:

PHP 5.2 provides the register_shutdown_function() function that enables capturing of fatal errors. Here's an implementation to send error emails upon encountering such errors:

register_shutdown_function("fatal_handler");

function fatal_handler() {
    $error = error_get_last();  // Obtain last error

    if ($error !== NULL) {
        $errno = $error["type"];
        $errfile = $error["file"];
        $errline = $error["line"];
        $errstr = $error["message"];

        error_mail(format_error($errno, $errstr, $errfile, $errline));
    }
}

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Supporting Functions:

Define the necessary supporting functions, such as format_error and error_mail. The format_error function can return the error information in a table format:

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

Errno

$errno

File$errfile Line$errline Trace

$trace

HTML; return $content; }

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Utilize Swift Mailer library to implement the error_mail function.

Additional Resources:

[$php_errormsg](https://www.php.net/manual/en/reserved.variables.errormsg.php)
[Predefined Constants](https://www.php.net/manual/en/language.constants.predefined.php)

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