note 82867 added to function.array-key-exists
| From: | tmont at osu1 dot php dot net | Date: | Tue, 29 Apr 2008 21:54:24 +0000 |
| Subject: | note 82867 added to function.array-key-exists | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-138918@lists.php.net to get a copy of this message | ||
The argument of array_key_exists() vs. isset() came up in the workplace today, so I conducted a
little benchmark to see which is faster:
<?php
// one-dimensional arrays
$array = array_fill(0,50000,'tommy is the best!');
$arraykeyexists_result = array();
$start = microtime(true);
for ($i = 0; $i < 100000; $i++) {
if (array_key_exists($i,$array)) {
$arraykeyexists_result[] = 1;
}
else {
$arraykeyexists_result[] = 0;
}
}
$arrtime = round(microtime(true)-$start,3);
$start = microtime(true);
for ($i = 0; $i < 100000; $i++) {
if (isset($array[$i])) {
$arraykeyexists_result[] = 1;
}
else {
$arraykeyexists_result[] = 0;
}
}
$istime = round(microtime(true)-$start,3);
$totaltime = $arrtime+$istime;
$arrpercentage = round(100*$arrtime/$totaltime,3);
$ispercentage = round(100*$istime/$totaltime,3);
echo "array_key_exists(): $arrtime [$arrpercentage%] seconds\n";
echo "isset(): $istime [$ispercentage%] seconds\n";
?>
On Windows, the output is similar to
array_key_exists(): 0.504 [82.895%] seconds
isset(): 0.104 [17.105%] seconds
On Mac or Linux, isset() is faster but only by a factor of approximately 1.5.
----
Server IP: 209.41.74.194
Probable Submitter: 207.114.185.110
----
Manual Page -- http://www.php.net/manual/en/function.array-key-exists.php
Edit -- https://master.php.net/note/edit/82867
Del: integrated -- https://master.php.net/note/delete/82867/integrated
Del: useless -- https://master.php.net/note/delete/82867/useless
Del: bad code -- https://master.php.net/note/delete/82867/bad+code
Del: spam -- https://master.php.net/note/delete/82867/spam
Del: non-english -- https://master.php.net/note/delete/82867/non-english
Del: in docs -- https://master.php.net/note/delete/82867/in+docs
Del: other reasons-- https://master.php.net/note/delete/82867
Reject -- https://master.php.net/note/reject/82867
Search -- https://master.php.net/manage/user-notes.php