How does the use of static variables in PHP classes create hidden dependencies and affect the flexibility of the code?

Using static variables in PHP classes creates hidden dependencies because they retain their value across multiple instances of the class, leading to unexpected behavior and potential conflicts. This can make the code harder to maintain and less flexible, as changes to one instance can affect others unintentionally. To solve this issue, it's recommended to avoid using static variables in classes and instead rely on instance variables for better encapsulation and flexibility. 

class MyClass {
    private $nonStaticVariable;

    public function __construct($value) {
        $this->nonStaticVariable = $value;
    }

    public function getValue() {
        return $this->nonStaticVariable;
    }
}

$instance1 = new MyClass(5);
$instance2 = new MyClass(10);

echo $instance1->getValue(); // Output: 5
echo $instance2->getValue(); // Output: 10

Keywords

static variables PHP classes hidden dependencies code flexibility technical implications

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