Can I Overwrite a Function in PHP Like This?

Overwriting a Function in PHP: A Walkthrough

In PHP, it is not possible to overwrite a function in the manner specified by the original question. However, there are alternative ways to achieve similar results.

Original Approach:

function ihatefooexamples() {
  return "boo-foo!";
};

// Redeclaration
if ($_GET['foolevel'] == 10) {
  function ihatefooexamples() {
    return "really boo-foo";
  };
};

This approach is not feasible as PHP does not allow redefining functions with the same name and parameters.

Alternative Approach Using OOP:

Polymorphism through object-oriented programming (OOP) is a better solution.

Create an interface Fooable and two classes Foo and FooBar that implement it.

interface Fooable
{
    public function ihatefooexamples();
}

class Foo implements Fooable
{
    public function ihatefooexamples()
    {
        return "boo-foo!";
    }
}

class FooBar implements Fooable
{
    public function ihatefooexamples()
    {
        return "really boo-foo";
    }
}

Instantiate the appropriate class based on the foolevel and call the ihatefooexamples method.

$foo = new Foo();

if (10 == $_GET['foolevel']) {
    $foo = new FooBar();
}

echo $foo->ihatefooexamples();

By using this OOP approach, we can dynamically change the behavior of the ihatefooexamples function based on the input parameter while maintaining function name consistency.

The above is the detailed content of Can I Overwrite a Function in PHP Like This?. For more information, please follow other related articles on the PHP Chinese website!