Bug #68830 [Nab]: in_array() always returns true when associative array contains 0 as the value

Edit report at https://bugs.php.net/bug.php?id=68830&edit=1 ID: 68830 User updated by: christopher dot r dot haley at gmail dot com Reported by: christopher dot r dot haley at gmail dot com Summary: in_array() always returns true when associative array contains 0 as the value Status: Not a bug Type: Bug Package: Scripting Engine problem PHP Version: 5.5.20 Block user comment: N Private report: N New Comment: Interesting, thank you! I wonder what js does that gives exactly the opposite result. At any rate, I was wrong, this quite obviously not a bug in PHP. Previous Comments: ------------------------------------------------------------------------ [2015-01-14 01:23:47] requinix@php.net > Wow, I never knew [a string] == 0. Non-numeric strings. To compare, PHP converts the string to a number (as opposed to converting the number to a string), and since "b" is non-numeric it converts to 0. $arr = array("a" => 123); echo intval(in_array("123", $arr)); // 1 echo intval(in_array("123", $arr, true)); // 0 ------------------------------------------------------------------------ [2015-01-14 01:14:46] christopher dot r dot haley at gmail dot com Wow, I never knew [a string] == 0. That's a strange mechanic in PHP; different than JavaScript! Thanks for the super fast response. You are right, you can close/delete this or whatever you need to do. ------------------------------------------------------------------------ [2015-01-14 01:07:00] requinix@php.net 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 in_array() does a loose comparison by default and 0 == "b". Use its third argument. ------------------------------------------------------------------------ [2015-01-14 00:57:16] christopher dot r dot haley at gmail dot com Description: ------------ --- From manual page: http://www.php.net/function.in-array --- From phpinfo(), the version is: 5.5.9-1ubuntu4.5 but that was not a choice in the drop down. It seems to span over other versions as well. Test script: --------------- $arr = array("a" => 0); echo intval(in_array("b", $arr)); Expected result: ---------------- Expected output is 0 (false) when the first argument is not present in second argument. Actual result: -------------- Output is 1 (true) regardless of the first argument. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=68830&edit=1