Missing $file in custom error handler

[dg]

In this case (http://3v4l.org/dWuvG) is $file empty string:

namespace X;

class Test
{
    public static function invoke()
    {
        set_error_handler(function($severity, $message, $file) {
            var_dump($file);
        });

        // E_WARNING trim() expects parameter 1 to be string, array give
        call_user_func_array('trim', array(array()));
    }

}

Test::invoke();

If you remove a namespace declaration, the problem will disappear (see http://3v4l.org/dETSj)

[noony]

printing backtrace content here shows that we have an empty content at 0 when we declare a namespace :

bt[7] | file :  , line : 0
bt[6] | file :  , line : 0
bt[5] | file :  , line : 0
bt[4] | file :  , line : 0
bt[3] | file :  , line : 0
bt[2] | file : /home/tcolomb/hhvm/hphp/test.php , line : 19
bt[1] | file : /home/tcolomb/hhvm/hphp/test.php , line : 14
bt[0] | file :  , line : 0

[jesseschalken]

If you replace the call_user_func_array('trim', array(array())) with \trim(array()), it produces the same result as Zend: https://3v4l.org/AHPHU

If you keep the call_user_func_array, for some reason HHVM behaves as though strict_types=1 and throws a TypeError, which I have filed separately: #7834

[lexidor]

I am going over old issues on this repository, to see which ones apply to the current versions of hhvm.

I have tested your repro, but with an explicit \trigger_error() and the filename was printed correctly.

<?hh // partial
namespace X;

class Test {
    public static function invoke() {
        \set_error_handler(function($severity, $message, $file) {
            \var_dump($file);
        });

        \trigger_error('array given', \E_USER_WARNING);
    }

}

Test::invoke();