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Bug #26122 Logical Operator "and" not functioning as expected
Submitted: 2003-11-04 16:00 UTC Modified: 2003-11-04 16:08 UTC
From: iam at nimajneb dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 4.3.2 OS: Mac OSX 10.2.6
Private report: No CVE-ID: None
 [2003-11-04 16:00 UTC] iam at nimajneb dot com
Description:
------------
Result of 'and' operator not what is expected. 1 and 0 and 1 => 1? Should be 0. See attached code sample. '&&' operator does function correctly however.

Reproduce code:
---------------
    $primary_err_valid = (($_POST['primary_err'] != "category") and ($_POST['primary_err'] != "separator"));
    $secondary_err_valid = (($_POST['secondary_err'] != "category") and ($_POST['secondary_err'] != "separator"));
    $tertiary_err_valid = (($_POST['tertiary_err'] != "category") and ($_POST['tertiary_err'] != "separator"));
    $error_valid = ($primary_err_valid) and ($secondary_err_valid) and ($tertiary_err_valid);

	echo "Pri: $primary_err_valid <br>";
	echo "Sec: $secondary_err_valid <br>";
	echo "Tri: $tertiary_err_valid <br>";
	echo "Total Error: $error_valid <br>";


Expected result:
----------------
Pri: 1
Sec: 
Tri: 1
Total Error: 

Actual result:
--------------
Pri: 1
Sec: 
Tri: 1
Total Error: 1

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 [2003-11-04 16:08 UTC] iliaa@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

'and' is equivalent to &, which is a bitwise operator. && is something else entirely.
 
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