How to call non-static method from static method of same class?

Question

I am working on PHP code.

Here is the sample code to explain my problem:

class Foo {

    public function fun1() {
             echo 'non-static';   
    }
    public static function fun2() {
        echo "static" ;
        //self::fun1();
        //Foo::fun1(); 
    }
}

How can I call the non-static method from the static method ?

Note: Both functions are used throughout the site, which is not known. I can't make any changes in the static/non-static nature of them.

I think non-static methods can be called by object only. because its dependent on class and static methods are independent. — Niklesh Raut
– Niklesh Raut, Commented Jan 13, 2017 at 9:49
Yeah, but inside class, how ? Shall I create object of same class in same own class's function ? — Rahul
– Rahul, Commented Jan 13, 2017 at 9:50
@Anant Non-static method getCommonData() should not be called statically. This message was showing for self:: and Foo:: — Rahul
– Rahul, Commented Jan 13, 2017 at 9:56

Mihai Matei · Accepted Answer · 2019-02-19 14:25:16Z

139

You must create a new object inside the static method to access non-static methods inside that class:

class Foo {

    public function fun1()
    {
        return 'non-static';
    }

    public static function fun2()
    {
        return (new self)->fun1();
    }
}

echo Foo::fun2();

The result would be non-static

Later edit: As seen an interest in passing variables to the constructor I will post an updated version of the class:

class Foo {

    private $foo;
    private $bar;

    public function __construct($foo, $bar)
    {
        $this->foo = $foo;
        $this->bar = $bar;
    }

    public function fun1()
    {
        return $this->foo . ' - ' . $this->bar;
    }

    public static function fun2($foo, $bar)
    {
        return (new self($foo, $bar))->fun1();
    }
}

echo Foo::fun2('foo', 'bar');

The result would be foo - bar

edited Feb 19, 2019 at 14:25

answered Jan 13, 2017 at 9:51

Mihai Matei

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3 Comments

Michael Oshosanya Over a year ago

How do you pass variables to be used by the constructor?

Trond Over a year ago

I would rather keep the class with static function as clean as possible. I would treat it as a static class. And in a static class you would not have a constructor would you? in PHP documentation is states: Declaring class properties or methods as static makes them accessible without needing an instantiation of the class. It would not surprise me if the PHP developers will remove the possibility to create non-static functions in a static class, and perhaps they also add static in front of class in future version. Just my guess. I have no knowledge of php development.

Fakhar Anwar Over a year ago

@Trond There is valid usecase where class with static members / properties should instantiate singleton using constructor and static function should call non-static one. I am implementing Swoole HTTP Request event providing it a call-back as a Class with static member. Static Member does two things; it creates Singleton Object of the class by doing initialization in class constructor, and second this static members does is to call a non-static method 'run()' to handle Request (by bridging with Phalcon). Hence, static class without constructor and non-static call will not work for me.

optimoose · Accepted Answer · 2017-01-13 09:56:59Z

5

The main difference would be that you can call static methods for a class without having to instantiate an object of that class. So, in your static method try

Foo $objInst = new Foo();
$objInst->fun1();

But I don't see how this would make any sense in any context.

answered Jan 13, 2017 at 9:56

optimoose

1311 silver badge7 bronze badges

1 Comment

Rahul Over a year ago

Thanks ! Working fine. But is there any rule whether we should instantiate object of same class in same class or not ?

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