How Do I destroy (unset) a variable in a different class? - php

Question

Is there anyway I can unset (and set a new value) for a variable in a core class of a script without touching the core code?
This is how the value of the variable set in the class:
class MyClass {
var $myvar = 'value';
...
...
}
I tried this, but didn't worked;
function unset_myvar($myvar) {
unset($myvar);
$myvar = 'newvalue';
return $myvar;
}
Thanks

Answer 1

Instead:
$myvar = 'newvalue';
you are looking for
$this->myvar = 'newvalue';
You are asking elementary question, so I suggest instead of just copying lines from my answer, you now head to PHP.net and read manual about PHP fundamentals

Answer 2

Try this:
class MyClass {
var $myvar = 'value';
function unset_myvar($myvar) {
unset($this->myvar);
$this->myvar = $myvar;
return $this->myvar;
}
}
So, now you can creat and object and unset variable and set another value to it:
$obj = MyClass ();
$obj = unset_myvar('someValue');

Answer 3

Simply:
class MyClass {
public $myvar = 'value';
...
...
}
$obj = new MyClass();
unset($obj->myvar);

Answer 4

The following code prints the value which was assigned , unsets the variable and then sets a new value to the variable.
<?php
class MyClass {
var $myvar = 'value';
public function dispvar()
{
echo $this->myvar;
}
public function destroyvar()
{
unset($this->myvar);
}
public function setvar($param)
{
$this->myvar=$param;
}
}
$a = new MyClass();
$a->dispvar(); //"prints" value
$a->destroyvar();
$a->dispvar(); //"prints" nothing !!
$a->setvar('blabla');
$a->dispvar(); //"prints" blabla
Demo