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What is static functions in php

This article describe the use of static function and their definition.

After Declare a class or methods as static they can access without needing an instantiation of the class.

Because static methods are callable without an instance of the object created, the pseudo-variable $this is not available inside the method declared as static.

Simply, static functions function independently of the class where they belong.
$this means, this is an object of this class. It does not apply to static functions

Entire difference is, you don't get $this supplied inside the static function. If you try to use $this , you'll get a Fatal error: Using $this when not in object context.


Caution

In PHP 5, calling non-static methods statically generates an
E_STRICT level warning.






Warning

In PHP 7, calling non-static methods statically is deprecated, and will
generate an E_DEPRECATED warning. Support for
calling non-static methods statically may be removed in the future.




class Foo {
    public static $static_variable = 'STATIC';
    public static function aStaticMethod() {
        echo 'Called a static function '. __FUNCTION__.' in class'. __CLASS__;
    }
}

class Bar extends Foo {
    public static function anotherStatic(){
        echo parent::$static_variable;
        parent::aStaticMethod();
    }
}
Foo::aStaticMethod();
printf("Access static variable - %s",Foo::$static_variable);
Bar::anotherStatic();

Well, okay, one other difference: an E_STRICT warning is generated by your first example.

In a nutshell, you don't have the object as $this in the second case, as the static method is a function/method of the class not the object instance.

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Source : php.net,  stackoverflow
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