<?php
//error_reporting(0);
set_error_handler(
static function (int $severity, string $message, string $file, int
$line): void {
throw new InternalErrorException($message, 0, $severity, $file,
$line);
}
);

xxx();

Output:

Fatal error: Uncaught Error: Call to undefined function xxx() in
/tmp/tmp.Ie1UVhkWcT/test.php on line 9

Error: Call to undefined function xxx() in /tmp/tmp.Ie1UVhkWcT/test.php
on line 9

Call Stack:
0.0001 392928 1. {main}() /tmp/tmp.Ie1UVhkWcT/test.php:0

Why error message showing is duplicate?
Furthermore, if uncommenting the error_reporting(0) instruction does not
show any errors.
is there a good compromise?

I have no idea, why it is like this.

alex kirjutas neljapäev, 10. juuni 2021 kl 12:04:11 UTC+3:
> <?php
> //error_reporting(0);
> set_error_handler(
> static function (int $severity, string $message, string $file, int
> $line): void {
> throw new InternalErrorException($message, 0, $severity, $file,
> $line);
> }
> );
>
> xxx();
>
> Output:
>
> Fatal error: Uncaught Error: Call to undefined function xxx() in
> /tmp/tmp.Ie1UVhkWcT/test.php on line 9
>
> Error: Call to undefined function xxx() in /tmp/tmp.Ie1UVhkWcT/test.php
> on line 9
>
> Call Stack:
> 0.0001 392928 1. {main}() /tmp/tmp.Ie1UVhkWcT/test.php:0
>
> Why error message showing is duplicate?
> Furthermore, if uncommenting the error_reporting(0) instruction does not
> show any errors.
> is there a good compromise?

alex:

> <?php
> //error_reporting(0);
> set_error_handler(
> static function (int $severity, string $message, string $file, int
> $line): void {
> throw new InternalErrorException($message, 0, $severity, $file,
> $line);
> }
> );
>
> xxx();
>
> Output:
>
> Fatal error: Uncaught Error: Call to undefined function xxx() in
> /tmp/tmp.Ie1UVhkWcT/test.php on line 9
>
> Error: Call to undefined function xxx() in /tmp/tmp.Ie1UVhkWcT/test.php
> on line 9
>
> Call Stack:
> 0.0001 392928 1. {main}() /tmp/tmp.Ie1UVhkWcT/test.php:0
>
> Why error message showing is duplicate?

I can't reproduce this. When I run this script with PHP 7.4 as CLI, I
only get the expected result:

PHP Fatal error: Uncaught Error: Call to undefined function xxx() in
D:\test-errorhandler.php:11
Stack trace:
#0 {main}
thrown in D:\test-errorhandler.php on line 11

Do you run the above script within a larger application which already
has some kind of error handling in place?

--
Arno Welzel
https://arnowelzel.de

Il 16/06/21 13:48, Arno Welzel ha scritto:
> I can't reproduce this.

????

> When I run this script with PHP 7.4 as CLI, I
> only get the expected result:
>
> PHP Fatal error: Uncaught Error: Call to undefined function xxx() in
> D:\test-errorhandler.php:11
> Stack trace:
> #0 {main}
> thrown in D:\test-errorhandler.php on line 11
>
> Do you run the above script within a larger application which already
> has some kind of error handling in place?

No.

$ php -v
PHP 7.4.3 (cli) (built: Oct 6 2020 15:47:56) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies
with Xdebug v2.9.2, Copyright (c) 2002-2020, by Derick Rethans
tmp.MLHFJ8krVq$ cat test.php
<?php
set_error_handler(
static function (int $severity, string $message, string $file, int
$line): void {
throw new InternalErrorException($message, 0, $severity, $file,
$line);
}
);
xxx();
tmp.MLHFJ8krVq$ php test.php

Fatal error: Uncaught Error: Call to undefined function xxx() in
/tmp/tmp.MLHFJ8krVq/test.php on line 7

Error: Call to undefined function xxx() in /tmp/tmp.MLHFJ8krVq/test.php
on line 7

Call Stack:
0.0001 394848 1. {main}() /tmp/tmp.MLHFJ8krVq/test.php:0

On 6/18/2021 8:53 AM, alex wrote:
> Il 16/06/21 13:48, Arno Welzel ha scritto:
>> I can't reproduce this.
>
> ????
>
>> When I run this script with PHP 7.4 as CLI, I
>> only get the expected result:
>>
>> PHP Fatal error:  Uncaught Error: Call to undefined function xxx() in
>> D:\test-errorhandler.php:11
>> Stack trace:
>> #0 {main}
>>    thrown in D:\test-errorhandler.php on line 11
>>
>> Do you run the above script within a larger application which already
>> has some kind of error handling in place?
>
> No.
>
> $ php -v
> PHP 7.4.3 (cli) (built: Oct  6 2020 15:47:56) ( NTS )
> Copyright (c) The PHP Group
> Zend Engine v3.4.0, Copyright (c) Zend Technologies
>     with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies
>     with Xdebug v2.9.2, Copyright (c) 2002-2020, by Derick Rethans
> tmp.MLHFJ8krVq$ cat test.php
> <?php
> set_error_handler(
>     static function (int $severity, string $message, string $file, int
> $line): void {
>         throw new InternalErrorException($message, 0, $severity, $file,
> $line);
>     }
> );
> xxx();
> tmp.MLHFJ8krVq$ php test.php
>
> Fatal error: Uncaught Error: Call to undefined function xxx() in
> /tmp/tmp.MLHFJ8krVq/test.php on line 7
>
> Error: Call to undefined function xxx() in /tmp/tmp.MLHFJ8krVq/test.php
> on line 7
>
> Call Stack:
>     0.0001     394848   1. {main}() /tmp/tmp.MLHFJ8krVq/test.php:0
>

set_error_handler() requires a real function as its parameter, not
something dynamically defined.

--
==================
Remove the "x" from my email address
Jerry Stuckle
jstucklex@attglobal.net
==================

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

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. "

--
==================
Remove the "x" from my email address
Jerry Stuckle
jstucklex@attglobal.net
==================

alex:

> Il 16/06/21 13:48, Arno Welzel ha scritto:
>> I can't reproduce this.
>
> ????

When I run your script, I only get *one* error output, not two.

>> When I run this script with PHP 7.4 as CLI, I
>> only get the expected result:
>>
>> PHP Fatal error: Uncaught Error: Call to undefined function xxx() in
>> D:\test-errorhandler.php:11
>> Stack trace:
>> #0 {main}
>> thrown in D:\test-errorhandler.php on line 11
>>
>> Do you run the above script within a larger application which already
>> has some kind of error handling in place?
>
> No.
>
> $ php -v
> PHP 7.4.3 (cli) (built: Oct 6 2020 15:47:56) ( NTS )
> Copyright (c) The PHP Group
> Zend Engine v3.4.0, Copyright (c) Zend Technologies
> with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies
> with Xdebug v2.9.2, Copyright (c) 2002-2020, by Derick Rethans
> tmp.MLHFJ8krVq$ cat test.php
> <?php
> set_error_handler(
> static function (int $severity, string $message, string $file, int
> $line): void {
> throw new InternalErrorException($message, 0, $severity, $file,
> $line);
> }
> );
> xxx();
> tmp.MLHFJ8krVq$ php test.php
>
> Fatal error: Uncaught Error: Call to undefined function xxx() in
> /tmp/tmp.MLHFJ8krVq/test.php on line 7
>
> Error: Call to undefined function xxx() in /tmp/tmp.MLHFJ8krVq/test.php
> on line 7
>
> Call Stack:
> 0.0001 394848 1. {main}() /tmp/tmp.MLHFJ8krVq/test.php:0

Does not happen here:

$ php -v
PHP 7.4.20 (cli) (built: Jun 4 2021 21:24:37) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
with Zend OPcache v7.4.20, Copyright (c), by Zend Technologies
with Xdebug v3.0.4, Copyright (c) 2002-2021, by Derick Rethans

$ cat error-test.php
<?php
set_error_handler(
static function (int $severity, string $message, string $file, int
$line): void {
throw new InternalErrorException($message, 0, $severity, $file,
$line);
}
);
xxx();

$ php error-test.php

$ php error-test.php
PHP Fatal error: Uncaught Error: Call to undefined function xxx() in
/home/arno/error-test.php:7
Stack trace:
#0 {main}
thrown in /home/arno/error-test.php on line 7

So this is a local problem specific to your setup.

--
Arno Welzel
https://arnowelzel.de

Jerry Stuckle:

[...]
> set_error_handler() requires a real function as its parameter, not
> something dynamically defined.

set_error_handler() requires a *callable* not a function. An anonymous
function is just fine - as this *is* a callable. This applies to *every*
function in PHP which wants a callable and is quite handy to avoid
declaring new functions if you just need it once for a specific callback:

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

<?php
$array = [
[ 'x' => 1, 'y' => 2 ],
[ 'x' => 6, 'y' => 1 ],
[ 'x' => 3, 'y' => 7 ],
];

usort(
$array,
function($a, $b) {
if ($a['x'] == $b['x']) {
return 0;
} else if ($a['x'] > $b['x']) {
return 1;
} else {
return -1;
}
}
);

print_r($array);

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

Result:

Array
( [0] => Array
(
[x] => 1
[y] => 2
)

[1] => Array
(
[x] => 3
[y] => 7
)

[2] => Array
(
[x] => 6
[y] => 1
)

)

--
Arno Welzel
https://arnowelzel.de

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

Il 20/06/21 12:51, Arno Welzel ha scritto:
> So this is a local problem specific to your setup.

But I would like to understand what it is.
Meanwhile, here's another curious thing.

<?php
echo $xxx;// one message (logical)
xxx();// two messages (not logical)

Output:

Notice: Undefined variable: xxx in /tmp/tmp.5vTeAJd7Py/test.php on line 2

Call Stack:
0.0001 391384 1. {main}() /tmp/tmp.5vTeAJd7Py/test.php:0

Fatal error: Uncaught Error: Call to undefined function xxx() in
/tmp/tmp.5vTeAJd7Py/test.php on line 3

Error: Call to undefined function xxx() in /tmp/tmp.5vTeAJd7Py/test.php
on line 3

Call Stack:
0.0001 391384 1. {main}() /tmp/tmp.5vTeAJd7Py/test.php:0

alex:

> Il 20/06/21 12:51, Arno Welzel ha scritto:
>> So this is a local problem specific to your setup.
>
> But I would like to understand what it is.

After playing around a bit with the code:

Propably because you have "display_errors = On" in your php.ini.

In my php.ini I have:

display_errors = Off

But when I change this to:

display_errors = On

Tada! Now I also get every error twice:

---------

$ php error-test.php
PHP Fatal error: Uncaught Error: Call to undefined function xxx() in
/home/arno/error-test.php:9
Stack trace:
#0 {main}
thrown in /home/arno/error-test.php on line 9

Fatal error: Uncaught Error: Call to undefined function xxx() in
/home/arno/error-test.php:9
Stack trace:
#0 {main}
thrown in /home/arno/error-test.php on line 9

---------

And even if set_error_handler() will be used, it stays like this:

---------

$ php error-test.php
PHP Fatal error: Uncaught Exception: Error catched: Division by zero in
/home/arno/error-test.php:4
Stack trace:
#0 /home/arno/error-test.php(8): {closure}()
#1 {main}
thrown in /home/arno/error-test.php on line 4

Fatal error: Uncaught Exception: Error catched: Division by zero in
/home/arno/error-test.php:4
Stack trace:
#0 /home/arno/error-test.php(8): {closure}()
#1 {main}
thrown in /home/arno/error-test.php on line 4

---------

So my verdict: make sure you have "display_errors = Off" in your php.ini.

--
Arno Welzel
https://arnowelzel.de

Il 21/06/21 19:43, Arno Welzel ha scritto:
> alex:
>
>> Il 20/06/21 12:51, Arno Welzel ha scritto:
>>> So this is a local problem specific to your setup.
>>
>> But I would like to understand what it is.
>
> After playing around a bit with the code:
>
> Propably because you have "display_errors = On" in your php.ini.
>
> In my php.ini I have:
>
> display_errors = Off
>
> But when I change this to:
>
> display_errors = On
>
> Tada! Now I also get every error twice:

Exact.
When it is off, no errors are seen.
Bah...
Strange behavior: you can't get the right compromise.

> $ php error-test.php
> PHP Fatal error: Uncaught Error: Call to undefined function xxx() in
> /home/arno/error-test.php:9
> Stack trace:
> #0 {main}
> thrown in /home/arno/error-test.php on line 9
>
> Fatal error: Uncaught Error: Call to undefined function xxx() in
> /home/arno/error-test.php:9
> Stack trace:
> #0 {main}
> thrown in /home/arno/error-test.php on line 9
>
> ---------
>
> And even if set_error_handler() will be used, it stays like this:
>
> ---------
>
> $ php error-test.php
> PHP Fatal error: Uncaught Exception: Error catched: Division by zero in
> /home/arno/error-test.php:4
> Stack trace:
> #0 /home/arno/error-test.php(8): {closure}()
> #1 {main}
> thrown in /home/arno/error-test.php on line 4
>
> Fatal error: Uncaught Exception: Error catched: Division by zero in
> /home/arno/error-test.php:4
> Stack trace:
> #0 /home/arno/error-test.php(8): {closure}()
> #1 {main}
> thrown in /home/arno/error-test.php on line 4
>
> ---------
>
> So my verdict: make sure you have "display_errors = Off" in your php.ini.
>
>

So as already mentioned (if no error handler is implemented) I can't see
any errors :|

On 22/06/2021 16.10, alex wrote:

> So as already mentioned (if no error handler is implemented) I can't see
> any errors :|

php.ini:
error_log = syslog

if enabled, errors will be logged to the systems log system

example:
Jun 22 16:09:39 machine php: PHP Fatal error: Uncaught Error: Call to
undefined function xx() in /tmp/a.php:2
Jun 22 16:09:39 machine php: Stack trace:
Jun 22 16:09:39 machine php: #0 {main}
Jun 22 16:09:39 machine php: thrown in /tmp/a.php on line 2

file in question:
<?php
xx();

--

//Aho

alex:

> Il 21/06/21 19:43, Arno Welzel ha scritto:
[...]
>> So my verdict: make sure you have "display_errors = Off" in your php.ini.
>>
>>
>
> So as already mentioned (if no error handler is implemented) I can't see
> any errors :|

I talk about display_errors and NOT error_reporting!

--
Arno Welzel
https://arnowelzel.de

Il 22/06/21 18:13, J.O. Aho ha scritto:
>
> On 22/06/2021 16.10, alex wrote:
>
>> So as already mentioned (if no error handler is implemented) I can't
>> see any errors :|
>
> php.ini:
> error_log = syslog
>
> if enabled, errors will be logged to the systems log system
>
>
> example:
> Jun 22 16:09:39 machine php: PHP Fatal error:  Uncaught Error: Call to
> undefined function xx() in /tmp/a.php:2
> Jun 22 16:09:39 machine php: Stack trace:
> Jun 22 16:09:39 machine php: #0 {main}
> Jun 22 16:09:39 machine php:   thrown in /tmp/a.php on line 2
>
> file in question:
> <?php
> xx();
>
>

<?php
var_dump(ini_get('error_log'));
xxx();
------------------
/tmp/tmp.PaOxmRpwmD/test.php:2:
string(6) "syslog"

Fatal error: Uncaught Error: Call to undefined function xxx() in
/tmp/tmp.PaOxmRpwmD/test.php on line 3

Error: Call to undefined function xxx() in /tmp/tmp.PaOxmRpwmD/test.php
on line 3

Call Stack:
0.0049 393400 1. {main}() /tmp/tmp.PaOxmRpwmD/test.php:0