Is it necessary to instantiate an object within the same script where a method is called, or are there more efficient ways to structure PHP code?

It is not necessary to instantiate an object within the same script where a method is called. One efficient way to structure PHP code is to create a separate class for the object and its methods, then instantiate the object in the main script where the method needs to be called.

// Define a class with the method
class MyClass {
    public function myMethod() {
        // Method logic here
        return "Method called";
    }
}

// Instantiate the class and call the method in the main script
$myObject = new MyClass();
echo $myObject->myMethod();