Static php binding ::

Php static binding static: for static binding in static binding, static: is not explained here. I want to use an instance to prove it. This example is from the official documentation:

For example one:

class A{   private function foo(){       echo "this is a test function"."
";   }   public function test(){       $this->foo();       static::foo();   }}$A=new A();$A->test();

Output result:
This is a test function
This is a test function

For example Two:

class A{   private function foo(){       echo "this is a test function"."
";   }   public function test(){       $this->foo();       static::foo();   }}class B extends A{}$B=new B();$B->test();

Output result:
This is a test function
This is a test function

For example three:

class A{   private function foo(){       echo "this is a test function"."
";   }   public function test(){       $this->foo();       static::foo();   }}class B extends A{}class C extends A{   private function foo(){   }    } $C=new C();$C->test();

Output result:
This is a test function
(! ) Fatal error: Call to private method C: foo () from context 'A' in D: \ www \ testXdebug \ index. php on line 21
Call Stack
Time Memory Function Location
1 0.0156 135536 {main }()... \ Index. php: 0
2 0.0156 135936 A-> test ()... \ Index. php: 35

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