From:
Operating system: Fedora 14
PHP version: 5.3.6
Package: *Programming Data Structures
Bug Type: Bug
Bug description:Using $variable--; and $variable -= '1'; yield different
results.
Description:
------------
While the code below may have other problems, the simple fact of the matter
is that when I uncomment "$int--;" and comment "$int -= '1';" the code will
loop for at least a minute, but when it is left as is below it does not and
will terminate as expected. Since I've been told the two pieces of code
have the exact same logic, I have no explaination for this. Please contact
me if you know why. The php package was installed using 'yum install php
php-mysql' on fedora 14.
Test script:
---------------
<?php
function GeneratePassword($int, $string){
$new_string = '';
while ($int >= 0){
$new_string += $string[rand(0, (strlen($string) - 1))];
//$int--;
$int -= '1';
echo 'round';
echo 'dump of int: ' . var_dump($int);
echo 'dump of string: ' . var_dump($string);
echo 'dump of new_string: ' . var_dump($new_string);
}
return ($new_string);
}
fwrite(STDOUT, "Choose an int");
$int = fgets(STDIN);
fwrite(STDOUT, "Choose a string");
$string = fgets(STDIN);
$pass = GeneratePassword($int, $string);
echo 'anything';
echo $pass;
?>
Actual result:
--------------
CASE 1 USING:
//$int--;
$int -= '1';
------------------------------------------------------
php -f delete_me2.php
Choose an int2
Choose a stringbb
roundint(1)
dump of int: string(3) "bb
"
dump of string: int(0)
dump of new_string: roundint(0)
dump of int: string(3) "bb
"
dump of string: int(0)
dump of new_string: roundint(-1)
dump of int: string(3) "bb
"
dump of string: int(0)
dump of new_string: anything0
CASE 2 USING:
$int--;
//$int -= '1';
------------------------------------------------------
php -f delete_me2.php
Choose an int2
Choose a stringbb
roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
dump of int: string(3) "bb
"
dump of string: string(0) ""
dump of new_string: roundstring(2) "2
"
... (loops for at least 60 seconds) ...
--
Edit bug report at http://bugs.php.net/bug.php?id=54549&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=54549&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=54549&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=54549&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=54549&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=54549&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=54549&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=54549&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=54549&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=54549&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=54549&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=54549&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=54549&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=54549&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=54549&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54549&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=54549&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=54549&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=54549&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=54549&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=54549&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=54549&r=mysqlcfg
