From: oliver at burtchen dot com
Operating system:
PHP version: 5.0.2
PHP Bug Type: Performance problem
Bug description: array_key_exists() makes a copy of the given array
Description:
------------
it looks loke array_key_exists() makes a copy of the given array if there
is a reference to that array. if there is no reference, everything works
well.
Reproduce code:
---------------
// just to get the time in microseconds
function getmicrotime() {
list($usec, $sec) = explode(" ",microtime());
return ((float)$usec + (float)$sec);
}
$cnt = 2000;
$a = array_fill(0, $cnt, 'foo');
// this works as aspected very fast
$mtime = getmicrotime();
for ($i = 0; $cnt > $i; $i++)
array_key_exists($i, $a);
echo getmicrotime() - $mtime . '<br>';
$b =& $a; // making a reference, but not using it
// this will take a huge amount of time, but it's the same code as above
$mtime = getmicrotime();
for ($i = 0; $cnt > $i; $i++)
array_key_exists($i, $a);
echo getmicrotime() - $mtime . '<br>';
Expected result:
----------------
the two loops should work the same.
--
Edit bug report at http://bugs.php.net/?id=30295&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=30295&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=30295&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=30295&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=30295&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=30295&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=30295&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=30295&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=30295&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=30295&r=support
Expected behavior: http://bugs.php.net/fix.php?id=30295&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=30295&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=30295&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=30295&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=30295&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=30295&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=30295&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=30295&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=30295&r=float
MySQL Configuration Error: http://bugs.php.net/fix.php?id=30295&r=mysqlcfg
