[PHP]Static Modifier

total_students;
echo Student::$total_students ."
";
echo Student::welcome_students() ."
";
echo Student::welcome_students("Greetings") ."
";
Student::$total_students = 1;
echo Student::$total_students ."
";

// static variables are shared throughout the inheritance tree.

  class One {
    static $foo;
  }
  class Two extends One { }
  class Three extends One { }
  
  One::$foo = 1;
  Two::$foo = 2;
  Three::$foo = 3;
  echo One::$foo;   // 3
  echo Two::$foo;   // 3
  echo Three::$foo; // 3
?>

0
Hello students.
Greetings students.
1
333