Doc #70160 [Opn->Ver]: string with double colon is callable, but cannot be called

Edit report at https://bugs.php.net/bug.php?id=70160&edit=1 ID: 70160 Updated by: cmb@php.net Reported by: cf0hay at gmail dot com Summary: string with double colon is callable, but cannot be called -Status: Open +Status: Verified Type: Documentation Problem -Package: Documentation problem +Package: Variables related -Operating System: 64bit Linux +Operating System: * -PHP Version: 5.6.11 +PHP Version: n/a -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: Actually, this is not a problem regarding the callable type hint or the passing of callables (which works as expected and documented), but rather a problem regarding variable functions[1]. If you use return call_user_func($x); instead of return $x;, the script works fine. See also request #68475, which has been implemented for PHP 7, but won't be backported to PHP 5. Anyhow, the documentation of variable functions is rather incomplete, which should be changed. [1] <http://php.net/manual/en/functions.variable-functions.php> Previous Comments: ------------------------------------------------------------------------ [2015-07-28 15:34:46] cf0hay at gmail dot com Description: ------------ callable typehint and is_callable may return true for a string with double colon, but it's not callable with parentheses. On the page http://php.net/manual/en/language.types.callable.php "As of PHP 5.2.3, it is also possible to pass 'ClassName::methodName'" Well, able to pass, but cannot use. Occurs in PHP 5.6. PHP 7.0 doesn't have this problem, it works properly. Test script: --------------- <?php namespace ns { class cls{ static function sfn(){ return 'OK'; } } } namespace { function mycallfn(callable $x){ if(is_callable($x)){ return $x(); }else{ return 'FAIL'; } } echo mycallfn(["ns\\cls", "sfn"])."\n"; echo mycallfn("ns\\cls::sfn")."\n"; } Expected result: ---------------- OK OK Actual result: -------------- OK PHP Fatal error: Call to undefined function ns\cls::sfn() on line 13 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70160&edit=1