Bug #79144 [Com]: FFI call exported function without referencing it

Edit report at https://bugs.php.net/bug.php?id=79144&edit=1 ID: 79144 Comment by: php at tim dot ainfach dot de Reported by: php at tim dot ainfach dot de Summary: FFI call exported function without referencing it Status: Not a bug Type: Bug Package: *Extensibility Functions Operating System: OSX 10.14.6 PHP Version: 7.4.1 Block user comment: N Private report: N New Comment: thank you for the explanation. it feels very inconsitent because for example if i export a function from C like here https://bugs.php.net/bug.php?id=79125 i am able fo call $ffi->FUNCTION() directly. there is a reason why different approaches were chosen here? Previous Comments: ------------------------------------------------------------------------ [2020-01-20 21:53:53] requinix@php.net $zend->zend_write is a property, not a method. It's as if you wrote $zend = new stdClass(); $zend->zend_write = function(string $str, int $str_length) { ... }; ------------------------------------------------------------------------ [2020-01-20 21:27:50] php at tim dot ainfach dot de Description: ------------ when using a function that is exported by php (ZEND_API) it's not possible to call the function directly. You've to create a reference to the function and then it is possible to call it. i would expect that it is possible to call the function directly. these are working fine: $a = $zend->zend_write; $a("aaa", 3); ($zend->zend_write)("aaa", 3); (clone $zend->zend_write)("aaa", 3); this doesn't work -> Attempt to call undefined C function 'zend_write' $zend->zend_write("aaa", 3); $a = [$zend, 'zend_write']; $a("aaa", 3); Test script: --------------- public static function assertObSame(string $expected, callable $cb) { ob_start(); $cb(); $res = ob_get_contents(); ob_end_clean(); static::assertSame($expected, $res); } public function testReturnU64() { $zend = FFI::cdef(" typedef int (*zend_write_func_t)(const char *str, size_t str_length); extern zend_write_func_t zend_write; "); static::assertObSame('aaa', function() use ($zend) { $a = $zend->zend_write; $a("aaa", 3); }); static::assertObSame('aaa', function() use ($zend) { ($zend->zend_write)("aaa", 3); }); static::assertObSame('aaa', function() use ($zend) { (clone $zend->zend_write)("aaa", 3); }); // does not work -> end up in a Attempt to call undefined C function 'zend_write' static::assertObSame('aaa', function() use ($zend) { $zend->zend_write("aaa", 3); }); static::assertObSame('aaa', function() use ($zend) { $a = [$zend, 'zend_write']; $a("aaa", 3); }); } Expected result: ---------------- all ways to call zend_write should give the same result (pass the assertion). Actual result: -------------- FFI\Exception: Attempt to call undefined C function 'zend_write' ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79144&edit=1