What are the potential pitfalls of declaring global variables in PHP classes and accessing them from other files?

Declaring global variables in PHP classes and accessing them from other files can lead to code that is difficult to maintain and debug, as it introduces hidden dependencies and makes it harder to track where variables are being modified. To solve this issue, it's better to use class properties with appropriate access modifiers (public, private, protected) and getter and setter methods to control access to these properties from outside the class. 

class MyClass {
    private $myProperty;

    public function setMyProperty($value) {
        $this->myProperty = $value;
    }

    public function getMyProperty() {
        return $this->myProperty;
    }
}

Keywords

global variables PHP classes accessing other files scope

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