PHP5 and Classes

Fatal error: Using $this when not in object context in ... on line 20

[thijsnetwork]

Hi,

I'm writing a class with some debugging functions, but it doesn't work... This is a simplified version, but the error is still showing up:

Fatal error: Using $this when not in object context in * on line 20

<?
class A {
 var $debug = array();
 function setDebug ($var) {
 $this->debug[microtime()] = $var;
 }
 
 function getDebug () {
 return $this->debug; 
 }
}
class B extends A {
 function fooBar () { // some function ...
 $this->setDebug("Some debug message"); // ... adds a debug message
 }
}
$foo = new A;
B::fooBar();
print_r($foo->getDebug);
?>

Does somebody know what I'm doing wrong? I would like to add debug messages in class B with the function defined in class A.

Cheers,

Thijs

[ergophobe]

Remember, $this refers to the current instance of the class which is an object, not a class.

When you do this:

$foo = new A;
B::fooBar();

There is no instance, no object, when you use the class resolution operator :: to access the method. So $this doesn't refer to anything. It is undefined. Therefore you are "using $this when not in object context".

If you do

$foo = new B;
$foo->fooBar();

That should work.