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php

$this return calling object.

php.internals

Jochem Maas

22 years ago

I have discovered behaviour which I imagine is not intended, name
referencing $this in a static method that is called from a from the
method of an instantiated. (see test code below.)

anyone have an explaination for $this is referencing the calling object
(at least in the build I'm using)?

I'm using PHP Version 5.0.0RC3-dev on an i686 Linux box:
PHP API  20031224
PHP Extension  20040412
Zend Extension  220040412
Configure Command
'../php5-cvs/configure' '--with-interbase=shared,/opt/firebird'
'--prefix=/usr' '--with-regex=system'
'--with-config-file-path=/etc/php5/apache' '--enable-calendar'
'--enable-ftp' '--with-gettext=shared' '--enable-sysvsem'
'--enable-sysvshm' '--enable-trans-sid' '--enable-debug'
'--disable-static' '--with-pcre-regex' '--enable-sockets'
'--with-zlib-dir=/usr' '--enable-wddx=shared--with-imap=shared,/usr'
'--with-kerberos=/usr' '--with-gd=shared,/usr' '--with-jpeg-dir=/usr'
'--with-png-dir=/usr' '--with-freetype-dir=/usr'
'--with-zlib=shared,/usr' '--with-xsl=shared,/usr'
'--with-apxs=/usr/bin/apxs' '--with-interbase=/opt/interbase'
'--with-interbase=/opt/interbase' '--with-gd=shared'


thanks in advance, sorry if this is misplaced.
-----

<?php

error_reporting(E_ALL & E_STRICT);

Class A {
function test() {
print_r( __CLASS__ );echo "\n";
print_r( __METHOD__ );echo "\n";
print_r( $this );echo "\n";
}
}

Class B { function test() { A::test(); } }

$b = new B();
$b->test();

?>

Ard Biesheuvel

22 years ago

Ha Jochem,

Jochem Maas wrote:

> I have discovered behaviour which I imagine is not intended, name
> referencing $this in a static method that is called from a from the
> method of an instantiated. (see test code below.)

> error_reporting(E_ALL & E_STRICT);

I'm sure you mean E_ALL | E_STRICT here ...

>
> Class A {
>     function test() {
>         print_r( __CLASS__ );echo "\n";
>         print_r( __METHOD__ );echo "\n";
>         print_r( $this );echo "\n";
>     }
> }
>
> Class B { function test() { A::test(); } }
>

This behaviour is intentional for methods that are not defined as
static. Also, as inherited methods are called using the parent:: syntax,
this is the only way to call overridden methods without losing $this
from scope along the way.

--
Ard