php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #72087 case $var !== 0 return wrong answer (only with 0)
Submitted: 2016-04-23 16:44 UTC Modified: 2016-04-23 16:58 UTC
From: sklogika2 at gmail dot com Assigned:
Status: Not a bug Package: *Programming Data Structures
PHP Version: 5.6.20 OS: Centos7
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If this is not your bug, you can add a comment by following this link.
If this is your bug, but you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: sklogika2 at gmail dot com
New email:
PHP Version: OS:

 

 [2016-04-23 16:44 UTC] sklogika2 at gmail dot com 
Description:
------------
In the code below I get result of "not zero" when I should get "zero"
Such case comparisons do not work properly only with 0, with other numbers it is ok




Test script:
---------------
$userId = 0;
switch ($userId) {
    case $userId !== 0:
        echo "not zero";
        break;
    case 'userIdKOZqAfk':
        echo "zero";
        break;
}

Expected result:
----------------
zero

Actual result:
--------------
not zero

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2016-04-23 16:46 UTC] sklogika2 at gmail dot com 
I'm sorry instead of case 'userIdKOZqAfk': should be default:
But idea is about !=0
 [2016-04-23 16:58 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2016-04-23 16:58 UTC] 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

"switch ($x) case $y" is the same as writing "if ($x == $y)". What you've written there is "if ($userId == ($userId !== 0))".

You should use

switch ($userId) {
  case 0:
    echo "zero";
    break;;
  default:
    echo "not zero";
    break;
}
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Fri Apr 19 15:01:28 2024 UTC