#44236 [Opn->Bgs]: short-circuiting on compound boolean in if expression
| From: | jani@php.net | Date: | Sun, 24 Feb 2008 19:48:50 +0000 |
| Subject: | #44236 [Opn->Bgs]: short-circuiting on compound boolean in if expression | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-122648@lists.php.net to get a copy of this message | ||
ID: 44236
Updated by: jani@php.net
Reported By: jvm at jvmyers dot com
-Status: Open
+Status: Bogus
Bug Type: Strings related
Operating System: Mac OSX 10.4.11
PHP Version: 5.2.5
New Comment:
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 http://www.php.net/support.php 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.
Previous Comments:
------------------------------------------------------------------------
[2008-02-24 18:25:31] jvm at jvmyers dot com
Description:
------------
Note: I am on a Mac and PHP 5.2.4 is the most recent version available
from entropy.
Problem: Compound booleans expressed as string args in an 'if'
statement don't 'appear' to work as expected:
Context:
1. I generate an array of counters.
2. I dynamically generate a compound boolean based on selected
counters in the array. (Note: since the real array is sparse, I must
use the 'empty' operator).
3. When I submit the compound boolean as the expression of an 'if'
statement, the 'if' appears to resolve ONLY the first element of the
compound boolean.
Conclusion: appears to be a short-circuiting issue
Case 1: 'if' expression passed as string => "1. Conditions met"
Case 2: same as Case 1, but using catenation operator => "2. Conditions
met"
Case 3: same 'if' expression but passed in context => "3. Conditions
not met"
Reproduce code:
---------------
<?php
$aArray = array(1,0);
$sCondition = "!empty($aArray[0]) && !empty($aArray[1])";
if ($sCondition)
{
echo "Case 1. Conditions met<br />";
}
else
{
echo "Case 1. Conditions not met<br />";
}
if ("".$sCondition."")
{
echo "Case 2. Conditions met<br />";
}
else
{
echo "Case 2. Conditions not met<br />";
}
if (!empty($aArray[0]) && !empty($aArray[1]))
{
echo "Case 3. Conditions met<br />";
}
else
{
echo "Case 3. Conditions not met<br />";
}
?>
Expected result:
----------------
See, Case 3, above.
Actual result:
--------------
See, Case 1 and Case 2, above.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=44236&edit=1