对象比数组好在哪里？

<?php
   $memory1 = microtime( TRUE );

   $data = array();

   for($i=0;$i<1000;$i++) {

       $data[] = array(
            'property1' => md5(microtime()),
            'property2' => md5(microtime()),
            'property3' => md5(microtime()),
       );

   }

   $array =  microtime( TRUE )- $memory1 . "\n";

   // Now do the same thing, but with a class..

   class Test {

       public $property1;
       public $property2;
       public $property3;

   }

   class Data {


   }

   $data = array();

   $memory1 = microtime( TRUE );
   $data = new Data();

   for($i=0;$i<1000;$i++) {

       $test = new Test();
       $test->property1 = md5(microtime());
       $test->property2 = md5(microtime());
       $test->property3 = md5(microtime());
       $data->$i = $test;


   }

   $object = microtime( TRUE )-$memory1;

   echo 'Arrays: ' . $first = floor($array * 1000000) . "\n";
   echo 'Objects: ' . $second = floor($object * 1000000)  . "\n" ;
   echo ($first-$second)/$first;


?>
结论： 对象比数组提升性能一般在2千分之- 20%