How can the use of global variables impact the functionality of PHP classes and their interactions?

Using global variables within PHP classes can lead to unexpected behavior and make the code harder to maintain. It can introduce dependencies that are not clear from the class definition and can make it difficult to track where and how the global variable is being modified. To avoid these issues, it's recommended to pass any necessary variables as parameters to the class methods instead of relying on global variables. 

// Avoid using global variables in PHP classes by passing necessary variables as parameters to class methods

class MyClass {
    private $variable;

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

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

// Example of how to use the MyClass class without global variables
$myClass = new MyClass();
$myClass->setVariable('Hello');
echo $myClass->getVariable(); // Output: Hello

Keywords

global variables PHP classes functionality interactions impact

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