#50878 [Opn->Bgs]: switch on constant does not enter correct block

ID: 50878 Updated by: aharvey@php.net Reported By: stephan dot schulze at kapthon dot com -Status: Open +Status: Bogus Bug Type: Scripting Engine problem Operating System: CentOs 5.4 PHP Version: 5.3.1 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 Switch uses loose comparison, so using a boolean true as the expression to be switched by will match any non-zero case. Case in point: <?php $f = true; switch ($f) { case -1: echo "matched\n"; break; default: echo "default\n"; } ?> This prints "matched", since -1 == true. This is documented (in some detail) at http://au2.php.net/manual/en/types.comparisons.php#types.comparisions-loose Previous Comments: ------------------------------------------------------------------------ [2010-01-29 08:29:34] stephan dot schulze at kapthon dot com Description: ------------ If a class function returns a class constant or true and the result is checked with a switch, the switch does not enter the correct block. I expect $bResult should be converted to 1 if it is "true" but not to -1. Reproduce code: --------------- <?php class Foo { const ERR_ONE = -1; public function bar() { return true; } public function isErr() { return self::ERR_ONE; } } $oFoo = new Foo(); $bResult = $oFoo->bar(); switch ($bResult) { case Foo::ERR_ONE: "ERR_ONE: " . var_dump($bResult); break; default: echo "default"; break; } $bResult = $oFoo->isErr(); switch ($bResult) { case Foo::ERR_ONE: "ERR_ONE: " . var_dump($bResult); break; default: echo "default"; break; } Expected result: ---------------- Expected to get "default" and "ERR_ONE: int(-1)" Actual result: -------------- ERR_ONE: bool(true) ERR_ONE: int(-1) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=50878&edit=1