Bug #79911 [Fbk->Nab]: isset - error when using array acess on stdClass

Edit report at https://bugs.php.net/bug.php?id=79911&edit=1 ID: 79911 Updated by: requinix@php.net Reported by: gregorio at bonfante dot dev Summary: isset - error when using array acess on stdClass -Status: Feedback +Status: Not a bug Type: Bug Package: *General Issues PHP Version: Irrelevant Block user comment: N Private report: N New Comment: The best place to talk about changing this would be on the internals mailing list. Because it's not the sort of thing that can simply be changed. https://www.php.net/mailing-lists.php Previous Comments: ------------------------------------------------------------------------ [2020-07-28 23:43:52] gregorio at bonfante dot dev I don't think it is a bug, but it is odd behavior when considering the behavior with an arrays, resources or scalars. For example """ <?php $null = null; $array = []; $string = 'string'; $int = 0; $resource = curl_init(); var_dump(isset($undef->x->x->x)); // bool(false) var_dump(isset($null->x->x->x)); //bool(false) var_dump(isset($array->x->x->x)); //bool(false) var_dump(isset($string->x->x->x)); //bool(false) var_dump(isset($int->x->x->x)); //bool(false) var_dump(isset($resource->x->x->x)); //bool(false) var_dump(isset($undef['x']['x']['x'])); //bool(false) var_dump(isset($null['x']['x']['x'])); //bool(false) var_dump(isset($array['x']['x']['x'])); //bool(false) var_dump(isset($string['x']['x']['x'])); //bool(false) var_dump(isset($int['x']['x']['x'])); //bool(false) var_dump(isset($resource['x']['x']['x'])); //ON 7.4 bool(false) ON 8 Uncaught Error: Cannot use object of type CurlHandle as array $obj = new stdClass(); var_dump(isset($obj->x->x->x)); //bool(false) var_dump(isset($obj['x'])); // Uncaught Error: Cannot use object of type stdClass as array """ ------------------------------------------------------------------------ [2020-07-28 23:17:22] requinix@php.net Why do you think this is a bug? Using [] syntax is specifically for arrays and objects implementing ArrayAccess. ------------------------------------------------------------------------ [2020-07-28 23:14:39] gregorio at bonfante dot dev Description: ------------ Similar to https://bugs.php.net/bug.php?id=55223 Not a bug, but still not what I expected. Using array access results in an error if the subject is an object without ArrayAccess. Not sure about the solution as I don't have familiarity with the PHP internals. I was able to adjust this behavior adding """ else if(!check_empty) { return 0; } """ to 'zend_std_has_dimension' on Zend/zend_object_handlers.c before the "else { zend_bad_array_access(ce); return 0; }" Test script: --------------- <?php $a = []; $o = new stdClass(); var_dump(isset($a->prop)); var_dump(isset($o[0])); Expected result: ---------------- bool(false) bool(false) Actual result: -------------- bool(false) Fatal error: Uncaught Error: Cannot use object of type stdClass as array in %s:%d Stack trace: #0 {main} thrown in %s on line %d ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79911&edit=1