<?php

$a = 010;
$b = 0xA;
$c = 2;

print $a + $b + $c;

?>

<?php

$a = 20;

function myfunction($b) {
	$a = 30;
	
	global $a, $c;
	return $c = ($b + $a);
}

print myfunction(40) + $c;

?>

<?php

function myfunction() {
        ???????
	print $string;
}

myfunction("Hello, World!");

?>

<?php

function &find_variable(&$one, &$two, &$three) {
	
	if($one > 10 && $one < 20) return $one;
	if($two > 10 && $two < 20) return $two;
	if($three > 10 && $three < 20) return $three;
}

$one = 2;
$two = 20;
$three = 15;

$var = &find_variable($one, $two, $three);

$var++;

print "1: $one, 2: $two, 3: $three";

?>

<?php
class myClass {
  private $a;

  public function __construct() {
    $this->a = 10;
  }

  public function printValue() {
    print "The Value is: {$this->a}\n";
  }

  public function changeValue($val, $obj = null) {
    if(is_null($obj)) {
      $this->a = $val;
    } else {
      $obj->a = $val;
    }
  }

  public function getValue() {
    return $this->a;
  }
}

$obj_one = new myClass();
$obj_two = new myClass();

$obj_one->changeValue(20, $obj_two);
$obj_two->changeValue($obj_two->getValue(), $obj_one);

$obj_two->printValue();
$obj_one->printValue();

?>

<?php

function duplicate($obj) {
	$newObj = $obj;
	return $newObj;
}

$a = new MyClass();

$a_copy = duplicate($a);

$a->setValue(10);
$a_copy->setValue(20);

?>