Does Php support method overloading

Question

Does php support method overloading. While trying below code it suggests it supports method overloading. Any views

class test
{
  public test($data1)
  {
     echo $data1;
  }
}

class test1 extends test
{
    public test($data1,$data2)
    {
       echo $data1.' '.$data2;
    }
}

$obj = new test1();
$obj->test('hello','world');

As i have overload the method it gives the output as "hello world". Above code snippet suggests php supports method overloading. So my question is does php support method overloading.

Check this answer stackoverflow.com/a/4697712/387194, in your case you don't use overloading but overwriting. The old function is not executed if you write $obj->test('hello'); — jcubic
– jcubic, Commented Jun 26, 2013 at 9:23
Refer : stackoverflow.com/questions/4697705/php-function-overloading — Arvind
– Arvind, Commented Jun 26, 2013 at 9:24

ilyes kooli · Accepted Answer · 2014-03-23 08:32:15Z

10

You should make the difference between method overriding (your example) and method overloading

Here is a simple example how to implement method overloading in PHP using __call magic method:

class test{
    public function __call($name, $arguments)
    {
        if ($name === 'test'){
            if(count($arguments) === 1 ){
                return $this->test1($arguments[0]);
            }
            if(count($arguments) === 2){
                return $this->test2($arguments[0], $arguments[1]);
            }
        }
    }

    private function test1($data1)
    {
       echo $data1;
    }

    private function test2($data1,$data2)
    {
       echo $data1.' '.$data2;
    }
}

$test = new test();
$test->test('one argument'); //echoes "one argument"
$test->test('two','arguments'); //echoes "two arguments"

edited Mar 23, 2014 at 8:32

answered Jun 26, 2013 at 9:40

ilyes kooli

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3 Comments

user1115652 Over a year ago

How do I make one of them protected and the other public? It seems that if __call needs to be public, that kind of opens the gates wide? Use case, public getter, protected setter both with the same name as the data property... or you might have to dissect caller info (might get a bit verbose)

Shan Over a year ago

Whether I can have multiple call functions here?

ilyes kooli Over a year ago

Please develop what you mean by multiple call functions. If is out of the scope of this question, please post it as a new question. I am sure you will get an accurate answer.

Rafael Barros · Accepted Answer · 2014-03-04 16:58:40Z

So my question is does php support method overloading(?).

Yes, but not in that way, and, in your example, it not suggests that this kind of overloading is correct, at least with the version 5.5.3 of it and error_reporting(E_ALL).

In that version, when you try to run this code, it gives you the following messages:

Strict Standards: Declaration of test1::test() should be compatible
with test::test($data1) in /opt/lampp/htdocs/teste/index.php on line 16

Warning: Missing argument 1 for test::test(), called in /opt/lampp/htdocs/teste/index.php 
on line 18 and defined in /opt/lampp/htdocs/teste/index.php on line 4

Notice: Undefined variable: data1 in /opt/lampp/htdocs/teste/index.php on line 6
hello world //it works, but the messages above suggests that it's wrong.

Kapil Yadav · Accepted Answer · 2015-10-13 10:47:51Z

0

You forgot to add 'function' before test in both cases. Method is called of child class because when you call a method from child class object it first check if that method exist in child class, if not then it look into inherited parent class with visibility public or protected check and if method is exist than return the result according to that.

answered Oct 13, 2015 at 10:47

Kapil Yadav

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1 Comment

Jesse Schokker Over a year ago

In PHP, the use of the function keyword is not required, and does not make a difference in this case.

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