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From: Arno Welzel <usenet@arnowelzel.de>
Newsgroups: comp.lang.php
Subject: Re: set_error_handler(): duplicate error
Date: Sun, 20 Jun 2021 13:10:28 +0200
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Xref: csiph.com comp.lang.php:18667

Jerry Stuckle:

> On 6/19/2021 10:41 AM, alex wrote:
>> Il 19/06/21 04:00, Jerry Stuckle ha scritto:
>>>
>>> set_error_handler() requires a real function as its parameter, not 
>>> something dynamically defined.
>>
>> class C {
>>      static function f($severity, $message) {
>>          throw new InternalErrorException($message);
>>      }
>> }
>>
>> set_error_handler('C::f');
>>
>> xxx();
>>
>> Output
>>
>> Fatal error: Uncaught Error: Call to undefined function xxx() in 
>> /tmp/tmp.F06vf0Q7H0/test.php on line 10
>>
>> Error: Call to undefined function xxx() in /tmp/tmp.F06vf0Q7H0/test.php 
>> on line 10
>>
>> Call Stack:
>>      0.0001     394552   1. {main}() /tmp/tmp.F06vf0Q7H0/test.php:0
>>
>>
> 
> Normal operation.  See the restrictions under set_error_handler(), namely
> 
> "The following error types cannot be handled with a user defined 
> function: E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, 
> E_COMPILE_ERROR, E_COMPILE_WARNING independent of where they were 
> raised, and most of E_STRICT raised in the file where 
> set_error_handler() is called. "

Thanks for pointing this out.

Also see: <https://www.php.net/manual/en/function.set-error-handler.php>

This means, if such an error ocurrs - like calling an undefined function
- it will *not* be passed to the handler defined in set_error_handler().

So this works:

------------------------------

<?php
set_error_handler(
     function(
         int $severity,
         string $message,
         string $file,
         int $line
     ): void {
         throw new Exception('Error catched: '.$message);
     }
);

$a = 1/0;

------------------------------

But this *not*, because calling an undefined function will *not* be
passed to the user error handler:

<?php
set_error_handler(
     function(
         int $severity,
         string $message,
         string $file,
         int $line
     ): void {
         throw new Exception('Error catched: '.$message);
     }
);

xxx();


-- 
Arno Welzel
https://arnowelzel.de