PHP Fatal error: Cannot re-assign $this

Question

I get this error from my script:

[Fri Apr 23 10:57:42 2010] [error] [client 10.0.0.1] PHP Fatal error:  Cannot re-assign $this in C:\\\\Program Files\\\\Apac         


        

Answer 1

$this is a predefined variable in PHP.

Here's the reference in the PHP manual: Classes and Objects: The Basics. It describes how, inside a method, $this points to "this object" that is being operated upon. It is still reserved outside a method, though.

Change the identifier to another word.

Answer 2

I'm not really a PHP expert, but i think $this is referring to the current object, so if you set this to null, you try to set the current object to nothing, wich can not work.

Answer 3

$this is a special variable in php. If this code is taking place inside a class, $this is a reference to the object the method is being invoked on. You cannot assign a new value to $this inside of a class. It is a limitation of PHP that you also cannot assign to a variable named $this outside of a class, where it would otherwise be valid to do so.

I believe this was valid in PHP4, but as of PHP5 You'll have to choose a new variable name.

Answer 4

You can reassign $this value by variable variable

$name = 'this';
$$name = 'stack';
echo $this;
// this will result stack