zend guard - Externals

13 years ago by Adi Mutu — view source — reply

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Hello,

Can anybody tell me what this struct is used for ?
I'm new to the internals of php.

Thanks,
A

13 years ago by jpauli — view source — reply

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Quickly reading the source and trying things, I suggest its a guard against
recursion in __get and __set handlers.
This way, code such this one won't infinitly loop :

class Foo {
public function __get($p) {
return $this->$p; // this should lead to a recursion loop
}
}

$f = new Foo;
echo $f->barbaz;

http://lxr.php.net/opengrok/xref/PHP_5_4/Zend/zend_object_handlers.c#440
http://lxr.php.net/opengrok/xref/PHP_5_4/Zend/zend_object_handlers.c#zend_get_property_guard
http://lxr.php.net/xref/PHP_5_4/Zend/zend.h#290

Julien.P

Hello,

Can anybody tell me what this struct is used for ?
I'm new to the internals of php.

Thanks,
A

13 years ago by Clint M Priest — view source — reply

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That's exactly what it's used for.

-----Original Message-----
From: julienpauli@gmail.com [mailto:julienpauli@gmail.com] On Behalf Of jpauli
Sent: Monday, January 30, 2012 10:27 AM
To: Adi Mutu
Cc: internals@lists.php.net
Subject: Re: [PHP-DEV] zend guard

Quickly reading the source and trying things, I suggest its a guard against recursion in __get and __set handlers.
This way, code such this one won't infinitly loop :

class Foo {
public function __get($p) {
return $this->$p; // this should lead to a recursion loop
}
}

$f = new Foo;
echo $f->barbaz;

Julien.P

Hello,

Can anybody tell me what this struct is used for ?
I'm new to the internals of php.

Thanks,
A