From:
Operating system:
PHP version: 5.3.2
Package: Arrays related
Bug Type: Bug
Bug description:Performance of serialize() is poor compared to json_encode()
Description:
------------
The performance of serialize() decreases if the data is deeply nested, eg.
consists of array inside an array.
Surprisingly, json_encode() is not affected by this issue, thus I'd say
there should be some optimizations not used in serialize()
serialize() performs great on arrays structured (key => val), but fails ion
structs like
array(
array(key => val)
...
)
Test script:
---------------
Benchmark json_encode() vs. serialize() on the following data:
$arr = array();
for($i = 0; $i < $num_size; $i++) {
$arr[md5($i)] = array(
sha1($i),
SplFixedArray::fromArray(
array_fill(
0, 10, hash('sha256', rand(0, $num_size))
)
)
);
}
Expected result:
----------------
More or less the same same time comsumed.
Actual result:
--------------
json_encode() is >3 times faster than serialize().
This increases if the arrays nesting level increases.
--
Edit bug report at http://bugs.php.net/bug.php?id=51267&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=51267&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=51267&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=51267&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=51267&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=51267&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=51267&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=51267&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=51267&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=51267&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=51267&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=51267&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=51267&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=51267&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=51267&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=51267&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=51267&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=51267&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=51267&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=51267&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=51267&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=51267&r=mysqlcfg
