Is PHP7 calling scope different from php5?

Today while studying __call() and __callStatic(), I read Brother Niao’s article PHP’s Calling Scope

But found that the results obtained by the following code are different in PHP5.5 and PHP7?

<code><?php
 class Foo {
     public function bar() {
         var_dump($this); //PHP5.5中打印的是A对象，PHP7是未定义，也就是NULL
     }
 }
 class A {
     public function test() {
         Foo::bar();
     }
 }
 $a  = new A();
 $a->test();
?></code>

I couldn’t find any instructions for adjusting this in PHP7. Thank you everyone for your advice

Reply content:

Today while studying __call() and __callStatic(), I read Brother Niao’s article PHP’s Calling Scope

But found that the results obtained by the following code are different in PHP5.5 and PHP7?

<code><?php
 class Foo {
     public function bar() {
         var_dump($this); //PHP5.5中打印的是A对象，PHP7是未定义，也就是NULL
     }
 }
 class A {
     public function test() {
         Foo::bar();
     }
 }
 $a  = new A();
 $a->test();
?></code>

I couldn’t find any instructions for adjusting this in PHP7. Thank you everyone for your advice

With this tweak, you can find it in PHP 7 which is not backwards compatible, and has been marked DEPRECATED in PHP 5.6

If you statically call a non-static method, you will be prompted that $this is not defined during the static call, and an error will be reported.

http://php.net/manual/en/migr...

http://m.runoob.com/php/php-d...