Req->Doc #72490 [Opn->Ver]: FILTER_VALIDATE_INT: unexpected result for bool and float

Edit report at https://bugs.php.net/bug.php?id=72490&edit=1 ID: 72490 Updated by: cmb@php.net Reported by: kzkggaara at mailhouse dot biz Summary: FILTER_VALIDATE_INT: unexpected result for bool and float -Status: Open +Status: Verified -Type: Feature/Change Request +Type: Documentation Problem Package: Filter related Operating System: Ubuntu 14 x64 PHP Version: 5.6.23 -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: This behavior stems from the fact that filter_var() converts scalar values to string[1] before actually filtering them. Considering these string casts, the behavior is consistent, see <https://3v4l.org/CZW0W>. [1] <https://github.com/php/php-src/blob/php-7.0.8/ext/filter/filter.c#L403> Previous Comments: ------------------------------------------------------------------------ [2016-06-24 21:09:59] kzkggaara at mailhouse dot biz Description: ------------ When using filter_var(X, FILTER_VALIDATE_INT), where X is: - true - result is int(1) - false - result is bool(false) - 1.1 - result is bool(false) - 0.0 - result is int(0) - '0.0' - result is bool(false) - '-0.0' - result is bool(false) Problems: - Why true is reported as valid 1 but false is invalid? Both are invalid. - Why 0.0 is reported as valid? Other floats are not. - Why the same 0.0 as a string is reported as invalid? This is inconsistent with ints: filter(X = '1') === filter(X = 1), i.e. ints as strings pass as valid. Test script: --------------- // Prints int(1). var_dump(filter_var(true, FILTER_VALIDATE_INT)); // ...but this prints bool(false). var_dump(filter_var(false, FILTER_VALIDATE_INT)); // -------- // Prints bool(false). var_dump(filter_var(1.1, FILTER_VALIDATE_INT)); // ...but this prints int(0). var_dump(filter_var(0.0, FILTER_VALIDATE_INT)); // ...but this again is bool(false). var_dump(filter_var('0.0', FILTER_VALIDATE_INT)); // Also bool(false). var_dump(filter_var('-0.0', FILTER_VALIDATE_INT)); Expected result: ---------------- I expect these to return bool(false): var_dump(filter_var(true, FILTER_VALIDATE_INT)); var_dump(filter_var(0.0, FILTER_VALIDATE_INT)); ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=72490&edit=1