What are some potential pitfalls of using global variables in PHP classes?

Using global variables in PHP classes can lead to issues with code readability, maintainability, and reusability. It can make it difficult to track where the variable is being modified or accessed, potentially causing unexpected behavior. To solve this issue, it's recommended to avoid using global variables within classes and instead pass variables as parameters or use class properties. 

class MyClass {
    private $myVariable;

    public function setVariable($value) {
        $this->myVariable = $value;
    }

    public function getVariable() {
        return $this->myVariable;
    }
}

$myObject = new MyClass();
$myObject->setVariable('example');

echo $myObject->getVariable(); // Output: example

Keywords

global variables PHP classes namespace collisions encapsulation code maintainability

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