PHP zval experiments

identity.php

<?php

final class v6_Variable{
  
  private $val;
  
  public function set($val){
    $this->val = $val;
  }
  
  public function get(){
    return $this->val;
  }
  
}

final class v6_Zval{
  
  private function __construct(){}
  
  public static function getZvalDump($a){
    $sc = new v6_Variable();
    ob_start(array($sc, 'set'));
    debug_zval_dump($a);
    ob_end_flush();
    return $sc->get();
  }
  
  public static function isIdentical($a, $b){
    $bd1 = self::getZvalDump($b);
    $aref = $a;
    $bd2 = self::getZvalDump($b);
    return $bd1 !== $bd2;
  }
  
}

function testIdentity($a, $b, $expected, $comment=''){
  echo $comment.' should be '.var_export($expected, true).': ';
  if(v6_Zval::isIdentical($a, $b) === $expected){
    echo 'OK';
  }else{
    echo 'ERROR!';
  }
}

$a = 1;
$b = 1;
testIdentity($a, $b, false, '');
testIdentity($b, $a, false, '');
$a = $b;
testIdentity($a, $b, true, '');
testIdentity($b, $a, true, '');