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Bug #41708 error on comparission
Submitted: 2007-06-15 19:50 UTC Modified: 2007-06-15 23:48 UTC
From: killton at gmail dot com Assigned:
Status: Not a bug Package: Strings related
PHP Version: 5.2.3 OS: LINUX
Private report: No CVE-ID: None
 [2007-06-15 19:50 UTC] killton at gmail dot com
When i do a comparission between a number and an empty string

Reproduce code:
$var = ''

if (0 == $var)
    echo "This is bad";
    echo "do some";

Expected result:
An empty string should not be equals to 0


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 [2007-06-15 23:48 UTC]
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

The second operand is converted to the first operand type, in this case the string '' is converted to an integer, as there are no numeric parts of '', as it needs to be some sort of value it is assigned 0.
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