What does the error message "Fatal error: Cannot re-assign $this" in PHP mean?

The error message "Fatal error: Cannot re-assign $this" in PHP means that you are trying to reassign the special variable $this, which is a reference to the current object instance, within a class context. To solve this issue, avoid reassigning the $this variable within a class method. Instead, use it to access properties and methods of the current object. 

class MyClass {
    private $myProperty;

    public function setProperty($value) {
        $this->myProperty = $value; // Correct usage of $this
    }
}

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Fatal error Cannot re-assign $this PHP Error message

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