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Bug #18535 int to string comparison problem
Submitted: 2002-07-24 06:31 UTC Modified: 2002-07-24 19:44 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: marcin dot smieszek at pointblue dot com dot pl Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 4.2.1 OS: linux
Private report: No CVE-ID: None
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From: marcin dot smieszek at pointblue dot com dot pl
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 [2002-07-24 06:31 UTC] marcin dot smieszek at pointblue dot com dot pl 
any variable, set, but set to 0 (but not "0") compared with any string always returns true.

try 
-------
if (0=="sth) {echo "problem";}
-------
or sth like this: 
-------
$a=array("blahblah","1",1,"0",0);
foreach ($a as $value)
    {
    if ($value == "aaaa")
	{
	echo "<b>true</b><br>";
	}
    else 
	{
	echo "false<br>";
	}
    }
------

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 [2002-07-24 07:21 UTC] hholzgra@php.net 
expected behaviour, use === to compare if you do not want type conversions to happen
 [2002-07-24 07:36 UTC] marcin dot smieszek at pointblue dot com dot pl 
:-)
then, shouldn't both (1=="aaa") and (0=="aaa") return the same - false or true?
 [2002-07-24 08:05 UTC] hholzgra@php.net 
no

the string gets converted to interger zero before 
comparison when using "==", so ...

using === both would be false
 [2002-07-24 08:14 UTC] marcin dot smieszek at pointblue dot com dot pl 
ok, all clear :-)
 
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