What are the potential pitfalls of using static functions in PHP, especially when transitioning from PHP 5 to PHP 7?

Potential pitfalls of using static functions in PHP include reduced testability, tight coupling, and difficulty in mocking for unit tests. When transitioning from PHP 5 to PHP 7, it's important to refactor static functions to instance methods to improve code maintainability and testability. 

class MyClass {
    public function myMethod() {
        // code here
    }
}

// Usage
$myClass = new MyClass();
$myClass->myMethod();

Keywords

static functions PHP 5 PHP 7 backward compatibility OOP

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