In what ways can the use of static methods in PHP lead to unknown global state and impact the overall functionality of the program?

Using static methods in PHP can lead to unknown global state because static methods do not require an instance of a class to be called, meaning they can be accessed from anywhere in the code. This can make it difficult to track changes to global variables and can lead to unexpected behavior. To solve this issue, it is recommended to avoid using static methods and instead use object-oriented programming principles like dependency injection to pass dependencies explicitly. 

class MyClass {
    private $dependency;

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

    public function doSomething() {
        // Use $this->dependency here
    }
}

$dependency = new Dependency();
$myClass = new MyClass($dependency);
$myClass->doSomething();

Keywords

static methods global state PHP functionality program

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