Bug #71099 [Nab]: Basic assertion failing in PHP 7

Edit report at https://bugs.php.net/bug.php?id=71099&edit=1 ID: 71099 User updated by: cdtreeks at gmail dot com Reported by: cdtreeks at gmail dot com Summary: Basic assertion failing in PHP 7 Status: Not a bug Type: Bug Package: Scripting Engine problem Operating System: CentOS 7 PHP Version: 7.0.0 Block user comment: N Private report: N New Comment: Perhaps it would have helped to mention the context here as I'm trying to validate $_POST data. For example a user submitting a value of 100 in a form. When PHP receives this it'll be a string. For strict form validation, I was trying to make sure that int fields were only even processing an int response. is_int() can't be used as when being used on a string, you'll get false. Is numeric can help, but this would also return true for a float. Seems the best way around it is a bit of a hack: <?php <?php $val_1 = 'test_string'; // Value is 'test_string' $val_2 = (string) (int) $val_1; // Value is '0' - This MUST be cast back to a string after typecasting the value to an int if ($val_1 == $val_2) { // This now works as expected as we're comparing two strings } else { ... } Previous Comments: ------------------------------------------------------------------------ [2015-12-11 23:51:41] rasmus@php.net You want === there otherwise you are comparing an int to a string and type coercion is going to make both sides int. The integer value of your string is 0 so 0 == 0. ------------------------------------------------------------------------ [2015-12-11 23:51:24] nikic@php.net This is how PHP has always worked, nothing to do with PHP 7. The "logic" behind it is that an integer to string comparison will cast the string to an integer, thus giving you the result you observe. I think this is generally agreed to be not very useful, but also unlikely to change due to BC concerns. ------------------------------------------------------------------------ [2015-12-11 23:42:48] cdtreeks at gmail dot com Description: ------------ Comparing two different values is failing to assert correctly in the latest release of PHP 7. See 'Test script' below for more details. Test script: --------------- <?php $val_1 = 'test_string'; // Value is 'test_string' $val_2 = (int) $val_1; // Value is 0 if ($val_1 == $val_2) { // PHP believes 'test_string' == 0 ... } else { ... } Expected result: ---------------- The else clause should be hit. Actual result: -------------- The initial condition is returning true ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=71099&edit=1