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Date: Sun, 09 May 2004 16:43:53 +0900
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Subject: Comparing objects on PHP5
From: rui_hirokawa@ybb.ne.jp (Rui Hirokawa)


Hi,

I think objects comparison in PHP5 has problems.
Here is small sample code,

<?php
class Foo {
  var $v = 1;
 }
 class Boo {
  var $v = 1;
 }
 $a = new Foo;
 $b = new Foo;
 $c = new Boo;
 $d = new Foo;
 $d->v = 2;
 $e = $a;

// value comparison
 echo $a == $b ? "same," : "not same,";
 echo $a == $c ? "same," : "not same,";
 echo $a == $d ? "same," : "not same,";
 echo $a == $e ? "same" : "not same";
 echo "\n";
// value and type comparison
 echo $a === $b ? "same," : "not same,";
 echo $a === $c ? "same," : "not same,";
 echo $a === $d ? "same," : "not same,";
 echo $a === $e ? "same" : "not same";
?>

The output from PHP4 and PHP5(ze1_compat on/off) is,

PHP 4.3.6 :
 same,not same,not same,same
 same,not same,not same,same

PHP 5.0.0RC2   zend.ze1_compatibility_mode=off :
 same,not same,not same,same
   (Notice: Object of class [Foo|Boo] could not be converted to integer)
 not same,not same,not same,same

PHP 5.0.0RC2   zend.ze1_compatibility_mode=on :
 same,same,not same,same
 not same,not same,not same,not same


The problem and question are,
1. the different class is recognised as same in PHP5 (ze1_compat=on).
2. the same object is recognised as different in PHP5 (ze1_compat=on).
3. Why integer casting of object was implicitly applied in PHP5
   (ze1_compat=off) ?

-- 
Rui Hirokawa <rui_hirokawa@ybb.ne.jp>