PHP handling fatal errors, and storing them in a file

Question

I'm using the following code to catch uncaught exceptions and errors,

function my_exception_handler($e) {
        $dataToStore = array("error" => $e, "server" => $_SERVER, "request" => $_REQUEST, "backtrace" => debug_backtrace());

                //Store $dataToStore in a file
}

function my_error_handler($no, $str, $file, $line) {
    $e = new ErrorException($str, $no, 0, $file, $line);
    my_exception_handler($e);
}

set_error_handler('my_error_handler');
set_exception_handler('my_exception_handler');

I was wondering if there is a way to make this store only FATAL ERRORS in a file, the $e array has a severity which is always 0 apparently.

You could always parse the error_log and grep for fatals.

Mike Purcell
– Mike Purcell

2012-04-25 20:35:52 +00:00
Commented Apr 25, 2012 at 20:35 — Mike Purcell
– Mike Purcell, Commented Apr 25, 2012 at 20:35

dan-lee · Accepted Answer · 2012-04-25 20:46:44Z

1

You need register_shutdown_function for this task:

register_shutdown_function(function() {
  $err = error_get_last(); 

  if(!is_null($err)) {
     if ($err['type'] == E_ERROR || $err['type'] == E_CORE_ERROR) { // extend if you want
       // write to file..
     }
  }
}); 

// test it with
ini_set('max_execution_time', 1); 
sleep(5);

$err['type'] can consist of constants defined on this page: Error Handling > Predefined Constants

For further information see: Catching fatal errors in PHP

edited Apr 25, 2012 at 20:46

answered Apr 25, 2012 at 20:39

dan-lee

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1 Comment

Mike Purcell Over a year ago

How does your code snippet differentiate between fatals and warnings?

daker · Accepted Answer · 2012-04-25 20:40:13Z

0

function my_error_handler($no, $str, $file, $line) {
    switch($no){
        case E_CORE_ERROR:    
            $e = new ErrorException($str, $no, 0, $file, $line);
            my_exception_handler($e);
            break;
    }
}

answered Apr 25, 2012 at 20:40

daker

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Comments

Jonathan · Accepted Answer · 2012-04-25 20:44:17Z

According to PHP's documentation on set_error_handler, the specified handler should be of the following form:

handler ( int $errno , string $errstr [, string $errfile [, int $errline [, array $errcontext ]]] )

(…)

The first parameter, errno, contains the level of the error raised, as an integer.

This means you should make your error handler this way:

<?php

function my_error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
    // Only process fatal errors
    if ($errno == E_ERROR) {
        // Do your error processing
    }
}

set_error_handler('my_error_handler');

?>

Using this method you can precisely control how you handle each sort of error.

If you only want to process the fatal errors, you could do is much easier:

mixed set_error_handler ( callable $error_handler [, int $error_types = E_ALL | E_STRICT ] )

The second parameter, $error_types, allows you to specify which errors should be processed with your custom error handler. You can just pass the E_ERROR constant, like this:

<?php

// Use your existing function

set_error_handler('my_error_handler', E_ERROR);

?>

Your logic makes sense but set_error_handler seems to ignore Fatal Errors, it catches everything but Fatal errors, by that I mean when a Fatal Error occurs, my_error_handler is not called, I'm using 5.2.13

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