Bug #75839 [Opn->Nab]: Undefined relation when objects compared

Edit report at https://bugs.php.net/bug.php?id=75839&edit=1 ID: 75839 Updated by: requinix@php.net Reported by: csongor at halmai dot hu Summary: Undefined relation when objects compared -Status: Open +Status: Not a bug Type: Bug Package: *General Issues PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php Objects of different classes are not comparable. http://php.net/manual/en/language.operators.comparison.php#language.operators.comparison.types Previous Comments: ------------------------------------------------------------------------ [2018-01-18 03:25:14] csongor at halmai dot hu Description: ------------ When I compare two obejcts from two different but identially-looking classes then the comparison operators yield contradicting results. In the samle code below, there are two variables $a and $b which are not in ==, nor in === nor in <= nor in >= relationship. Moreover, the spaceship operator tells that $a>$b and $b>$a as well. Test script: --------------- error_reporting(E_ALL); class Objy_1 { public $v =1; } class Objy_2 { public $v =2; } $a = new Objy_1(); $b = new Objy_2(); var_dump($a < $b); // false var_dump($a > $b); // false var_dump($a == $b); // false var_dump($a === $b); // false var_dump($a <=> $b); // false var_dump($a <=> $b); // 1 which means $a > $b var_dump($b <=> $a); // 1 which means $b > $a Expected result: ---------------- I would expect non-contradicting results. In this concrete cases, I think $a == $b should be true, $a <=> $b and $b <=> $a should be 0. Moreover, I think it would be nice to get a warning if I want to compare objects from different classes. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75839&edit=1