What is the error message "Using $this when not in object context" in PHP 5 indicating?

The error message "Using $this when not in object context" in PHP 5 indicates that you are trying to use the $this keyword outside of a class method, where it is not valid. To solve this issue, make sure that you are using $this within a class method. Example code snippet:

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

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