From: bugs dot php dot net at nanonanonano dot net
Operating system: Linux
PHP version: 5CVS-2006-05-23 (snap)
PHP Bug Type: Performance problem
Bug description: array_key_exists performance is poor for &$array
Description:
------------
If there is a reference taken to an array ($b =& $a) then the performance
of array_key_exists($foo, $a) drops off enormously unless
array_key_exists($foo, &$a) is used.
(Note this is identical to #30295 which is marked as fixed in CVS but
doesn't appear to be fixed at all: it is found in both 4CVS and 5CVS)
Reproduce code:
---------------
Based on the code in bug #30295:
http://pastebin.com/733286
Expected result:
----------------
Time for the following operations should be approximately the same:
array_key_exists($i, $a);
$b =& $a; array_key_exists($i, $a);
$b =& $a; array_key_exists($i, &$a);
Actual result:
--------------
Time for
$b =& $a; array_key_exists($i, $a);
is significantly greater than for the others.
Sample times from running the reproduce code:
Test with no refs: 0.0012528896331787
Test with a ref to the array: 0.78344106674194
Test with a ref to the array and pass by ref: 0.0019340515136719
--
Edit bug report at http://bugs.php.net/?id=37563&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=37563&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=37563&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=37563&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=37563&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=37563&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=37563&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=37563&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=37563&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=37563&r=support
Expected behavior: http://bugs.php.net/fix.php?id=37563&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=37563&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=37563&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=37563&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=37563&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=37563&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=37563&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=37563&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=37563&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=37563&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=37563&r=mysqlcfg
