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

go to bug id or search bugs for

Bug #1259 Double in a string comparision bug after converting with strval and intval
Submitted: 1999-03-23 01:03 UTC Modified: 1999-03-23 07:41 UTC
From: mlemos at acm dot org Assigned:
Status: Closed Package: Compile Failure
PHP Version: 3.0.7 OS: Any
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: mlemos at acm dot org
New email:
PHP Version: OS:

 

 [1999-03-23 01:03 UTC] mlemos at acm dot org 
The following script should demonstrate that if you have a floating point
number in a string and then convert it with intval and strval, PHP says
they are the same where they shouldn't be.

<?
 $value="1.";
 echo "(\"$value\"==strval(intval(\"$value\")))=",$value==strval(intval($value))," intval(\"$value\")=",intval($value),"\n";
 $value=".1";
 echo "(\"$value\"==strval(intval(\"$value\")))=",$value==strval(intval($value))," intval(\"$value\")=",intval($value),"\n";
 $value="1.0";
 echo "(\"$value\"==strval(intval(\"$value\")))=",$value==strval(intval($value))," intval(\"$value\")=",intval($value),"\n";
 $value="1";
 echo "(\"$value\"==strval(intval(\"$value\")))=",$value==strval(intval($value))," intval(\"$value\")=",intval($value),"\n";
?>

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [1999-03-23 07:41 UTC] zeev 
That example is way too cryptic.  I doubt there is a bug here, but if there is, demonstrate it in a simple and concise manner instead of this gobblygook.
---
The behavior you claim you see is indeed existant, but it's not
a bug, but an intended behavior.  A much shorter and elegant
way to demonstrate the bug in its essence, would be:
print (string) 1.;
which would, in turn, generate the output:
1
and same goes for
print (string) 1.0000;

PHP's string conversion routines supress any trailing zeros, very
much on purpose.  If you want to force a certain amount of decimal
digits, use printf() or sprintf() instead of echo or print.
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Thu Jul 03 15:01:34 2025 UTC