Bug #55731 [Bgs]: __get after __unset

Edit report at https://bugs.php.net/bug.php?id=55731&edit=1 ID: 55731 User updated by: 421034509 at qq dot com Reported by: 421034509 at qq dot com Summary: __get after __unset Status: Bogus Type: Bug Package: Unknown/Other Function Operating System: windows xp PHP Version: 5.3.8 Block user comment: N Private report: N New Comment: p1: You mean __unset() made the p1 out of $example->properties? When get_property_info successed, zend vm return a property info with name "\0Example\0p1" but it can't find p1 in $example->properties ? So zend vm try to fetch "\0Example\0p1" and set a getter_guard for "\0Example\0p1" and call getter again. p2: When get_property_info successed, zend vm return a property info with name "\0Example\0p2" and p2 can be found in $example->properties. So zend vm wont try to fetch "\0Example\0p1" but successed and return p2? Previous Comments: ------------------------------------------------------------------------ [2011-09-21 03:32:28] laruence@php.net p2 is a litte different, see blow: 1. you call $example->p2 2. zend vm call read_propery , in which internal will check property_info and socpe, since this is called out from example->ce, so get_property_info will deny and return NULL, then zend vm assume you are try to access a public "p2"() 3. so zend vm set a getter_guard for "p2" and call getter try to find "p2" (output "call_get()!") 4. in your custom getter, you fetch $example->p2 5. zend vm call read_property, the first begining is similar to the situation when you trying to fetch p1, but, zend vm find p2 in $example->properties(this it the key difference), then suceed and return. ------------------------------------------------------------------------ [2011-09-21 00:48:39] 421034509 at qq dot com Thanks for your explain,but there is something I still can't understand. In 2:what's the "called out from $Example->ce" mean? (Sorry!My English is poor and I have studied PHP a short time) Do you mean I call $example->p1 out of the class? If so,I call $example->p2 out of the class too. Then,in my custom getter, I attempt fetch $this->p2. in this case, it attempt to access p2 in example class scope , why dosn't it call getter again? Can you explain why $example->p2 call getter only once for me like before? ------------------------------------------------------------------------ [2011-09-20 09:42:43] laruence@php.net I have give you a example which will only call get once after unset, and okey, if you want a more specific explain, here we go: 1. you call $example->p1 2. zend vm call read_propery , in which internal will check property_info and socpe, since this is called out from example->ce, so get_property_info will deny and return NULL, then zend vm assume you are try to access a public "p1"() 3. so zend vm set a getter_guard for "p1" and call getter try to find "p1" (output "call_get()!") 4. in your custom getter, you attempt fetch $this->p1 5. in this case, you attempt to access p1 in example class scope , so get_property_info successed, and return a property info with name "\0Example\0p1" 5. zend vm try to fetch "\0Example\0p1" now, set a getter_guard for "\0Example\0p1" and call getter again (output "call_get()!") 7. zend vm found call getter in getter(by gettter_guard which was setted in 5), then give up, and return. ------------------------------------------------------------------------ [2011-09-20 08:47:14] 421034509 at qq dot com I want to know what happened after __unset. $example->p1 has bean unset and $example->p2 is never set. But isset($example->p1)) and isset($example->p2)) are all false. Why $example->p2 call __get once but $example->p1 call __get twice? What's the diference of the $example->p1 which has bean unset and the $example->p2 which is never set"? ------------------------------------------------------------------------ [2011-09-20 04:07:07] laruence@php.net see blow, and I think you will find out the reason: <?php class Example{ private $p1; function __construct($a){ $this->p1=$a; } function __get($elmname){ echo "Call_get()!"; //In order to follow the method __get() } function __unset($name){ unset($this->$name); } } $example = new Example("v1"); unset($example->p1); echo $example->p1; ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=55731 -- Edit this bug report at https://bugs.php.net/bug.php?id=55731&edit=1