#31332 [NEW]: unserialize() works terribly slow on huge strings compared to 4.3.9

From: Date: Wed, 29 Dec 2004 11:30:23 +0000
Subject: #31332 [NEW]: unserialize() works terribly slow on huge strings compared to 4.3.9
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-71207@lists.php.net to get a copy of this message 
From:             marekm at apnet dot pl
Operating system: Win32/Linux
PHP version:      4.3.10
PHP Bug Type:     Performance problem
Bug description:  unserialize() works terribly slow on huge strings compared to 4.3.9

Description:
------------
I keep big multidimensional arrays serialize()'d into strings in
database.
After upgrade from 4.3.9 -> 4.3.10 I noticed, that unserialize() function
on some of them work even 20 times slower. On other the slowdown is
minimal. 

Reproduce code:
---------------
<?
function getmicrotime() 
{ 
    list($usec, $sec) = explode(" ", microtime()); 
    return ((float)$usec + (float)$sec); 
} 

$f=fopen("serialized.txt","r");
$l1=fgets($f,1000000);
fclose($f);

$t1=getmicrotime();
$a=unserialize($l1);
echo(getmicrotime()-$t1);
?>

The tested "serialized.txt" file can be downloaded from
http://ap.aptus.pl/serialized.txt

Expected result:
----------------
The above script working as fast as in 4.3.9

Actual result:
--------------
The script works about 20x slower.

-- 
Edit bug report at http://bugs.php.net/?id=31332&edit=1
-- 
Try a CVS snapshot (php4):   http://bugs.php.net/fix.php?id=31332&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=31332&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=31332&r=trysnapshot51
Fixed in CVS:                http://bugs.php.net/fix.php?id=31332&r=fixedcvs
Fixed in release:            http://bugs.php.net/fix.php?id=31332&r=alreadyfixed
Need backtrace:              http://bugs.php.net/fix.php?id=31332&r=needtrace
Need Reproduce Script:       http://bugs.php.net/fix.php?id=31332&r=needscript
Try newer version:           http://bugs.php.net/fix.php?id=31332&r=oldversion
Not developer issue:         http://bugs.php.net/fix.php?id=31332&r=support
Expected behavior:           http://bugs.php.net/fix.php?id=31332&r=notwrong
Not enough info:             http://bugs.php.net/fix.php?id=31332&r=notenoughinfo
Submitted twice:             http://bugs.php.net/fix.php?id=31332&r=submittedtwice
register_globals:            http://bugs.php.net/fix.php?id=31332&r=globals
PHP 3 support discontinued:  http://bugs.php.net/fix.php?id=31332&r=php3
Daylight Savings:            http://bugs.php.net/fix.php?id=31332&r=dst
IIS Stability:               http://bugs.php.net/fix.php?id=31332&r=isapi
Install GNU Sed:             http://bugs.php.net/fix.php?id=31332&r=gnused
Floating point limitations:  http://bugs.php.net/fix.php?id=31332&r=float
No Zend Extensions:          http://bugs.php.net/fix.php?id=31332&r=nozend
MySQL Configuration Error:   http://bugs.php.net/fix.php?id=31332&r=mysqlcfg

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