From: zhalassy at loginet dot hu
Operating system: Any
PHP version: 5.2.9
PHP Bug Type: Math related
Bug description: array_product(array()) returns 0 instead of 1.
Description:
------------
array_product(array()) returns 0 instead of 1. Empty product is 1 (hence
"1" is neutral in multiplication) in mathematics.
Example:
array_product(array(1,2)) * array_product(array(3,4)) === /* should be */
array_product(array()) * array_product(array(1,2,3,4));
example implementation:
function array_product($array){
$product = 1;
foreach($array as $element) $product *= $element;
return $product;
}
Reproduce code:
---------------
echo product_array(array());
Expected result:
----------------
It should return 1.
Actual result:
--------------
It returns 0.
--
Edit bug report at http://bugs.php.net/?id=48484&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=48484&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=48484&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=48484&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=48484&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=48484&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=48484&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=48484&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=48484&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=48484&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=48484&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=48484&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=48484&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=48484&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=48484&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=48484&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=48484&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=48484&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=48484&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=48484&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=48484&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=48484&r=mysqlcfg
