If you call a static method from within an object, the static method will inherit the $this pointer of the calling object. This script demonstrates the problem:

<?php

error_reporting(E_ALL);

class StaticClass {
    function doSomething() {
        echo $this->data;
    }
}

class Instantiated {
    var $data;

    function Instantiated($data) {
        $this->data = $data;
        StaticClass::doSomething();
    }
}

$ob = new Instantiated('foo');

?>


This is rather confusing behavior - $this should be out of scope inside static methods no matter what.