What is the error message "Fatal error: Using $this when not in object context" indicating in the PHP code?

The error message "Fatal error: Using $this when not in object context" indicates that the code is trying to use the $this keyword outside of a class method. To solve this issue, make sure that the code using $this is inside a class method.

class MyClass {
    public function myMethod() {
        // Use $this keyword here
        $this->someProperty = 'value';
    }
}

// Incorrect usage outside of a class method
// $this->someProperty = 'value';