#39901 [Opn->Bgs]: casting of string with numbers in it still does INT conversion

ID: 39901 Updated by: tony2001@php.net Reported By: schizoduckie at gmail dot com -Status: Open +Status: Bogus Bug Type: Variables related Operating System: Win32/XP PHP Version: 5CVS-2006-12-20 (snap) New Comment: switch() construct uses "==" semantics to compare values, which compares numeric strings as numbers: var_dump("0123"=="123"); => true If you want to compare numeric strings as strings, use "===": var_dump("0123"==="123"); => false. This is expected behaviour. Previous Comments: ------------------------------------------------------------------------ [2006-12-20 13:16:41] schizoduckie at gmail dot com Description: ------------ In a switch, a value that is declared as string with a prefix 0 will automatically disappear in switched values, even if all of them are specifically casted as a string. Reproduce code: --------------- $field = (string)"0123"; settype($field, 'string'); // just to make sure, for testcase switch ($field) { case '123': $result = 'first'; break; case '456': $result = 'second'; break; default: $result = 'third'; break; } echo $result; // first, due to string / int conversion. switch ((string)$field) // explicit cast to string { case (string)'123': $result = 'first'; break; // more (unneccesary casts just to be sure) case (string)'456': $result = 'second'; break; default: $result = 'third'; break; } echo $result; // first! ???? Expected result: ---------------- I would have expected the last result echo to be third because of the explicit typecasting. This problem appears in all php versions up to 5.2 snapshot of today. Actual result: -------------- the code in the example speaks for itself. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=39901&edit=1