A static call to a non-static method fires, how so?

Question

PHP

There are non-static methods - test1 and test2
When they are called statically, they work as static ones, what's the catch?

class Test {
  
  public function test(){
    echo 'ты меня видишь';
  }
  public function test2(){
    echo 12;
  }
}

$d = Test::test1(); // выводит: ты меня видишь
$a = Test::test2(); // выводит: 12

Answer 1

fixed in php 7. before that it was BC BREAK

Answer 2

This is PHP.

Answer 3

sandbox.onlinephpfunctions.com
checked your code.
It throws a Warning, but the code executes.
Such is our PHP.

<br />
<b>Strict Standards</b>:  Non-static method Test::test1() should not be called statically in <b>[...][...]</b> on line <b>11</b><br />
ты меня видишь<br />
<b>Strict Standards</b>:  Non-static method Test::test2() should not be called statically in <b>[...][...]</b> on line <b>12</b><br />
12

Answer 4

The method does not use object data, so nothing prevents it from being called statically. If inside there was a call to the field through $this, then an error would pop up.
And yes, it's PHP...