Trace static binding and method binding call

static-binding.php

<?php
/**
 * Created by PhpStorm.
 * User: Azhar
 * Date: 7/15/14
 * Time: 10:59 AM
 */


$indent = 0;
function print_txt($text)
{
   global $indent;
   print str_repeat('    ', $indent) . $text . PHP_EOL;
}


class A
{
   static function static1()
   {
      global $indent;
      $indent++;
      print_txt('A::static1(); ' . get_called_class() . '::static1();');
      print_txt('');
      $indent--;
   }

   static function static2()
   {
      global $indent;
      $indent++;
      print_txt('A::static2(); ' . get_called_class() . '::static2();');

      print_txt('static1 - static');
      static::static1();
      print_txt('static1 - self');
      self::static1();
      $indent--;
   }

   static function static3()
   {
      global $indent;
      $indent++;
      print_txt('A::static3(); ' . get_called_class() . '::static3();');

      print_txt('static2 - static');
      static::static2();
      print_txt('static2 - self');
      self::static2();
      $indent--;
   }

   function public1()
   {
      global $indent;
      $indent++;
      print_txt('A->public1(); ' . get_called_class() . '->public1();');
      print_txt('');
      $indent--;
   }

   function public2()
   {
      global $indent;
      $indent++;
      print_txt('A->public2(); ' . get_called_class() . '->public2();');

      print_txt('static1 - static');
      static::static1();
      print_txt('static1 - self');
      self::static1();

      print_txt('public1 - $this');
      $this->public1();
      print_txt('public1 - self');
      self::public1();
      $indent--;
   }

   function public3()
   {
      global $indent;
      $indent++;
      print_txt('A->public3(); ' . get_called_class() . '->public3();');

      print_txt('static2 - static');
      static::static2();
      print_txt('static2 - self');
      self::static2();

      print_txt('public2 - $this');
      $this->public2();
      print_txt('public2 - self');
      self::public2();
      $indent--;
   }
}

class B extends A
{
   static function static2()
   {
      global $indent;
      $indent++;
      print_txt('B::static2(); ' . get_called_class() . '::static2();');

      print_txt('static1 - static');
      static::static1();
      print_txt('static1 - self');
      self::static1();
      print_txt('static2 - parent');
      parent::static2();
      $indent--;
   }

   static function static3()
   {
      global $indent;
      $indent++;
      print_txt('B::static3(); ' . get_called_class() . '::static3();');

      print_txt('static2 - static');
      static::static2();
      print_txt('static2 - self');
      self::static2();
      print_txt('static3 - parent');
      parent::static3();
      $indent--;
   }

   function public2()
   {
      global $indent;
      $indent++;
      print_txt('B->public2(); ' . get_called_class() . '->public2();');

      print_txt('static1 - static');
      static::static1();
      print_txt('static1 - self');
      self::static1();

      print_txt('public1 - $this');
      $this->public1();
      print_txt('public1 - self');
      self::public1();

      print_txt('public2 - parent');
      parent::public2();
      $indent--;
   }

   function public3()
   {
      global $indent;
      $indent++;
      print_txt('B->public3(); ' . get_called_class() . '->public3();');

      print_txt('static2 - static');
      static::static2();
      print_txt('static2 - self');
      self::static2();

      print_txt('public2 - $this');
      $this->public2();
      print_txt('public2 - self');
      self::public2();

      print_txt('public3 - parent');
      parent::public3();
      $indent--;
   }
}

print PHP_EOL . 'static2 - A' . PHP_EOL;
A::static2();
print PHP_EOL . 'static2 - B' . PHP_EOL;
B::static2();
print PHP_EOL . 'static3 - B' . PHP_EOL;
B::static3();

$a = new A();
print PHP_EOL . 'public2 - $a' . PHP_EOL;
$a->public2();

$b = new B();
print PHP_EOL . 'public2 - $b' . PHP_EOL;
$b->public2();
print PHP_EOL . 'public3 - $b' . PHP_EOL;
$b->public3();