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

go to bug id or search bugs for

Bug #70132 bit(1) always seen as true
Submitted: 2015-07-24 16:56 UTC Modified: 2021-03-02 13:35 UTC
Votes:2
Avg. Score:4.0 ± 1.0
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: stanimir at datacentrix dot org Assigned: cmb (profile)
Status: Closed Package: PDO MySQL
PHP Version: 5.6.11 OS: linux
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: stanimir at datacentrix dot org
New email:
PHP Version: OS:

 

 [2015-07-24 16:56 UTC] stanimir at datacentrix dot org 
Description:
------------
Using MySQL 5.5.44, BIT(1) column returns either 0x00 or 0x01,
both are considered as true by the language.

Test script:
---------------
var_dump((bool) chr(0x00));

Expected result:
----------------
boolean false

Actual result:
--------------
boolean true

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2015-07-25 21:45 UTC] fontanalorenz at gmail dot com 
AFAIK the expected result is true because when 0x00 is converted by chr gives you a one char string so when you cast to bool it returns true;

To verify that you can just do

<?php

$chr = chr(0x00);

var_dump((bool)$chr); // bool(true)
var_dump(strlen($chr)); // int(1)
 [2015-07-30 20:22 UTC] cmb@php.net 
Related To: Bug #70170
 [2021-03-02 13:35 UTC] cmb@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: cmb
 [2021-03-02 13:35 UTC] cmb@php.net 
Indeed, casting a string with a NUL byte to bool is supposed to
return true.  No issue here.

Anyhow, it appears this issue has been fixed in the meantime. With
emulated prepares, I get `string(1) "0"` and `string(1) "1"`,
respectively, and without emulated prepares I get int(0)/int(1).
So casting to bool yields the desired result.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Sun Dec 22 01:01:30 2024 UTC