Edit report at https://bugs.php.net/bug.php?id=63538&edit=1

 ID:                 63538
 Updated by:         yohg...@php.net
 Reported by:        indey...@php.net
 Summary:            "Call to undefined function" should be catchable
-Status:             Open
+Status:             Assigned
 Type:               Feature/Change Request
 Package:            Scripting Engine problem
 Operating System:   any
 PHP Version:        5.5.0alpha1
-Assigned To:        
+Assigned To:        yohgaki
 Block user comment: N
 Private report:     N

 New Comment:

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.


Previous Comments:
------------------------------------------------------------------------
[2013-04-30 11:28:07] 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?

------------------------------------------------------------------------
[2012-11-29 10:37:38] indey...@php.net

bensor987 that's a separate issue. autoloader is a specific solution, while 
ability to handle such error is more generic

------------------------------------------------------------------------
[2012-11-29 10:15:05] bensor987 at neuf dot fr

I think it is better to add a function autoloader, instead of just catching 
this error.

------------------------------------------------------------------------
[2012-11-23 19:37:12] 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

------------------------------------------------------------------------
[2012-11-16 10:13:02] indey...@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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