How to use non-static and static method together without creating an external instance in PHP

Question

I have below scenario, want to use specific method as static so can i use $this for other methods or not.

class foobar {
    public $foo;

    public function __construct() {
        global $foo;

        $this->foo = $foo;
    }

    public static function foobarfunc() {
        return self::foo();
    }
    public function foo() {
        return $this->foo = 'hi';
    }
}
echo foobar::foobarfunc();

ERROR:

Fatal error: Using $this when not in object context in

This is my scenario

class DB{
    public function selectQuery(){
        $data = $this->finddata();
        return "SELECT $data FROM bhumi";
    }
    public function finddata(){
        $data = ('*');
        return $data;
    }
}
class TP extends DB{
    public static $create;
    
    public function __construct(){
       $this->parentObj = new DB();
    }
    public static function printQ(){
        $d = parent::selectQuery();
        return $d;
    }
}
echo TP::printQ();

How to do that? this code giving me error.

return self::foo(); <-- foo() isn't static. You need to create an instance first — Johan, Feb 28 '18 at 13:00
Why using static to return result of classical instance ? make no sens.. — Fky, Feb 28 '18 at 13:06
When you dont wat to create an instance, foo() should be static too. See my answer — Johan, Feb 28 '18 at 13:08
I simply don't get what are you trying to achieve. [There is a difference between static and instance methods](https://stackoverflow.com/questions/30402978/php-static-vs-instance-method) — Aniket Sahrawat, Feb 28 '18 at 13:10
@AniketSahrawat: I want to use non-static and static method together without creating an external instance. — Bhumi Shah, Feb 28 '18 at 13:16
You should create an instance inside your class. See AliShojaei's answer. But still it does not make sense to me unless you say that you want to create a static factory method as `foobarfunc`. See [this](https://stackoverflow.com/a/8959150/6099347) answer. [You can also make it singleton](https://stackoverflow.com/questions/3319434/singleton-pattern). — Aniket Sahrawat, Feb 28 '18 at 13:44

score 1 · Answer 1 · edited Feb 28 '18 at 13:10

1

try this way

public static function foobarfunc() {
    $foobar = new self();
    return $foobar->foo();
}

edited Feb 28 '18 at 13:10

ishegg

9,685
3
16
31

answered Feb 28 '18 at 13:04

ali shojaei

84
1
5

is this correct way or another answer one? – Bhumi Shah Feb 28 '18 at 13:14
@BhumiShah I think this answer makes more sense in whatever you're trying to do, since you can keep your `foo()` method non-static. – ishegg Feb 28 '18 at 13:23

score 1 · Answer 2 · answered Feb 28 '18 at 13:07

1

When you dont want to create an instance, ignoring the reasons why:

<?php 
 class foobar {
public static $foo;

public function __construct() {
    global $foo;

    $this->foo = $foo;
}

public static function foobarfunc() {
    return self::foo();
}
public static function foo() {
    return self::$foo = 'Hi!';;
}
}
echo foobar::foobarfunc();
?>

answered Feb 28 '18 at 13:07

Johan

931
9
23

is this correct way or another answer one? – Bhumi Shah Feb 28 '18 at 13:14

score 0 · Answer 3 · answered Feb 28 '18 at 13:08

0

public static function foobarfunc() {
    return self::foo();
}

You just want to load another static method called "foo". This method exist and is not static, so the error is valid.

You can fix it with

public static function foobarfunc() {
    $instance = new self();
    return $instance->foo();
}

Albeit, the usefullness of this use be left open.

answered Feb 28 '18 at 13:08

Brain Foo Long

2,057
23
28

is this correct way? – Bhumi Shah Feb 28 '18 at 13:15
1

@BhumiShah There is no "correct" way. It all depends on what you need to do. – Brain Foo Long Feb 28 '18 at 14:34

How to use non-static and static method together without creating an external instance in PHP

3 Answers3