How to catch undefined functions with set_error_handler in PHP

Question

I\'m taking the leap: my PHP scripts will ALL fail gracefully!

At least, that\'s what I\'m hoping for...`

I don\'t want to wrap (practically) every single line i

Answer 1

I've been playing around with error handling for some time and it seems like it works for the most part.

function fatalHandler() {
    global $fatalHandlerError, $fatalHandlerTitle;

    $fatalHandlerError = error_get_last();

    if( $fatalHandlerError !== null ) {

        print($fatalHandlerTitle="{$fatalHandlerTitle} | ".join(" | ", $fatalHandlerError).
                (preg_match("/memory/i", $fatalHandlerError["message"]) ? " | Mem: limit ".ini_get('memory_limit')." / peak ".round(memory_get_peak_usage(true)/(1024*1024))."M" : "")."\n".
                        "GET: ".var_export($_GET,1)."\n".
                        "POST: ".var_export($_POST,1)."\n".
                        "SESSION: ".var_export($_SESSION,1)."\n".
                        "HEADERS: ".var_export(getallheaders(),1));
    }

    return $fatalHandlerTitle;
}

function fatalHandlerInit($title="phpError") {
    global $fatalHandlerError, $fatalHandlerTitle;

    $fatalHandlerTitle = $title;
    $fatalHandlerError = error_get_last();

    set_error_handler( "fatalHandler" );
}

Now I have an issue where if the memory is exhausted, it doesn't report it every time. It seems like it depends on how much memory is being used. I did a script to load a large file (takes ~6.6M of memory) in an infinite loop. Setup1:

ini_set('memory_limit', '296M');

fatalHandlerInit("testing");

$file[] = file("large file"); // copy paste a bunch of times

In this case I get the error to be reports and it dies on 45 file load.

Setup2 - same but change: ini_set('memory_limit', '299M');

This time I don't get an error and it doesn't even call my custom error function. The script dies on the same line.

Does anyone have a clue why and how to go around that?