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Bug #68686 spurious warning about errors in array_*() callbacks
Submitted: 2014-12-29 14:03 UTC Modified: 2017-12-06 18:06 UTC
Votes:2
Avg. Score:4.5 ± 0.5
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:2 (100.0%)
From: clement dot herreman at gmail dot com Assigned: nikic (profile)
Status: Closed Package: Arrays related
PHP Version: 5.6.4 OS: OS X Maverick, Centos
Private report: No CVE-ID: None
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 [2014-12-29 14:03 UTC] clement dot herreman at gmail dot com
Description:
------------
When throwing an exception is the callback of array_map or array_filter, an E_WARNING is triggered ("Warning: array_filter(): An error occurred while invoking the filter callback in /your/script.php on line XX").

If no error handler is set, then the warning is directly sent to the output.

If an error handler is set via set_error_handler then: 
  * The error handler is not called at all
  * The warning simply disappear and are nowhere to be found

Test script:
---------------
<?php
/* Sample script: `php this.php` to see the warning in the output
 *                `php this.php 1` to try to setup an error handler
 */
if (!empty($argv[1])) {
    set_error_handler(function ($errno, $errstr) {
        printf("(%d) %s\n", $errno, $errstr);
    });
}

function failFilter()
{
    try {
        array_filter([1, 2, 3, 4], function ($n) {
            throw new \Exception('Some exception');
        });
    } catch (\Exception $e) {

    }
}

function failMapException()
{
    try {
        array_map(function ($n) {
            throw new \Exception('oops');
        }, [1, 2, 3]);
    } catch (\Exception $e) {

    }
}

function failMapTriggerError()
{
    try {
        array_map(function ($n) {
            trigger_error('Some error');
        }, [1, 2, 3]);
    } catch (\Exception $e) {

    }
}

failFilter();
failMapException();
failMapTriggerError();

Expected result:
----------------
(1024) Some exception
(1024) Some exception
(1024) Some exception

(1024) oops
(1024) oops
(1024) oops

(1024) Some error
(1024) Some error
(1024) Some error

Actual result:
--------------
cherreman@mlil-cherreman ~ $ php test.php
PHP Warning:  array_filter(): An error occurred while invoking the filter callback in /Users/cherreman/test.php on line 14

Warning: array_filter(): An error occurred while invoking the filter callback in /Users/cherreman/test.php on line 14
PHP Warning:  array_map(): An error occurred while invoking the map callback in /Users/cherreman/test.php on line 25

Warning: array_map(): An error occurred while invoking the map callback in /Users/cherreman/test.php on line 25
PHP Notice:  Some error in /Users/cherreman/test.php on line 35

Notice: Some error in /Users/cherreman/test.php on line 35
PHP Notice:  Some error in /Users/cherreman/test.php on line 35

Notice: Some error in /Users/cherreman/test.php on line 35
PHP Notice:  Some error in /Users/cherreman/test.php on line 35

Notice: Some error in /Users/cherreman/test.php on line 35
cherreman@mlil-cherreman ~ $ php test.php 1
(1024) Some error
(1024) Some error
(1024) Some error

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2015-01-06 16:32 UTC] danack@php.net
I'm not going to mark it as a duplicate, as they are really separate issues, but the issue described here should be resolved when the issue https://bugs.php.net/bug.php?id=55416 is fixed.
 [2015-10-30 21:56 UTC] devsoc at gmail dot com
It seems that issue #55416 has not fixed this. The warning still occurs: PHP 5.6.4-4ubuntu6.3 (cli) (built: Sep 29 2015 12:44:47).

array_reduce(['a'], function () { throw new \Exception(); });
 [2016-07-25 11:59 UTC] cmb@php.net
-Summary: set_error_handler cannot catch warning triggered by an exception in a callback +Summary: spurious warning about errors in array_*() callbacks -Status: Open +Status: Verified -Package: Output Control +Package: Arrays related
 [2016-07-25 11:59 UTC] cmb@php.net
For the record: this issue has already been fixed as of PHP 7.0.0,
see <https://3v4l.org/kKKcT#v560> and <https://3v4l.org/sW6Mb>.

The fact that the error handler isn't called in the supplied test
script is expected behavior, because the exception has already
been caught.
 [2017-12-06 18:06 UTC] nikic@php.net
-Status: Verified +Status: Closed -Assigned To: +Assigned To: nikic
 [2017-12-06 18:06 UTC] nikic@php.net
Closing as this is fixed in PHP 7 and 5.6 is out of active support.
 
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