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Request #63538 "Call to undefined function" should be catchable
Submitted: 2012-11-16 10:13 UTC Modified: 2015-03-21 20:41 UTC
Votes:17
Avg. Score:3.9 ± 1.3
Reproduced:10 of 11 (90.9%)
Same Version:2 (20.0%)
Same OS:5 (50.0%)
From: indeyets@php.net Assigned: yohgaki (profile)
Status: Closed Package: Scripting Engine problem
PHP Version: 5.5.0alpha1 OS: any
Private report: No CVE-ID: None
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 [2012-11-16 10:13 UTC] indeyets@php.net 
Description:
------------
At the moment, call to undefined function results as "Fatal error". On the other hand, it can be easily handled programmatically either by including required file or just defining function dynamically.

Test script:
---------------
<?php

set_error_handler(function($errno , $errstr){
    if (strpos($errstr, 'Call to undefined function there_is_no_me()') === 0) {
        function there_is_no_me()
        {
            echo "Here am I!\n";
        }
    }
});

there_is_no_me();


Expected result:
----------------
Here am I!

Actual result:
--------------
Fatal error: Call to undefined function there_is_no_me()

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 [2012-11-23 19:37 UTC] lubosdz at hotmail dot com 
What about function_exists() ?

set_error_handler(function($errno , $errstr){
    if (!function_exists('there_is_no_me')) {
        function there_is_no_me(){
            echo "Here am I!\n";
        }
    }
});

lubosdz
 [2012-11-29 10:15 UTC] bensor987 at neuf dot fr 
I think it is better to add a function autoloader, instead of just catching this error.
 [2012-11-29 10:37 UTC] indeyets@php.net 
bensor987 that's a separate issue. autoloader is a specific solution, while 
ability to handle such error is more generic
 [2013-04-30 11:28 UTC] jevon at jevon dot org 
In particular, this would allow developers to handle undefined functions in batch scripts and the like. Since one can catch undefined classes (through an autoloader), undefined class methods (through __call() and __callStatic()) and undefined variables (through set_error_handler()), why shouldn't we be able  to catch undefined functions?
 [2013-06-28 07:14 UTC] yohgaki@php.net
-Status: Open +Status: Assigned -Assigned To: +Assigned To: yohgaki
 [2013-06-28 07:14 UTC] yohgaki@php.net 
Old PHPs were able to catch E_ERROR.

I always think E_ERROR should be able to catch by user defined error handler. The 
reason why E_ERROR made uncatchable is there were many users that shot their own 
foot by not terminating execution. However, user should be able to own foot by 
catching E_ERROR.

I think PHP should give chance user to display 500 page.
 [2013-06-28 08:27 UTC] yohgaki@php.net 
This is a PoC patch for catching E_ERROR/E_PARSE.

https://github.com/yohgaki/php-src/compare/master-catch-e_error
 [2015-03-21 20:41 UTC] nikic@php.net
-Status: Assigned +Status: Closed
 [2015-03-21 20:41 UTC] nikic@php.net 
It's possible to catch this as of PHP 7, see https://wiki.php.net/rfc/engine_exceptions_for_php7.
 
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