note 98500 deleted from function.array-unique by danbrown
| From: | danbrown@php.net | Date: | Fri, 18 Jun 2010 23:57:21 +0000 |
| Subject: | note 98500 deleted from function.array-unique by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-170256@lists.php.net to get a copy of this message | ||
Note Submitter: michiel ed thalent nl
----
Then what is even faster is using array_flip.
<?php
$max = 1000000;
$arr = range(1,$max,3);
$arr2 = range(1,$max,2);
$arr = array_merge($arr,$arr2);
$time = -microtime(true);
$res1 = array_unique($arr);
$time += microtime(true);
echo "deduped to ".count($res1)." in ".$time;
// deduped to 666667 in 13.498242855072
$time = -microtime(true);
$res2 = array();
$res2 = array_flip($arr);
$res2 = array_keys($res2);
$time += microtime(true);
echo "<br />deduped to ".count($res2)." in ".$time;
// deduped to 666667 in 0.37050104141235
$time = -microtime(true);
$res3 = array();
foreach($arr as $key=>$val) {
$res3[$val] = true;
}
$res3 = array_keys($res3);
$time += microtime(true);
echo "<br />deduped to ".count($res3)." in ".$time;
// deduped to 666667 in 0.54348206520081
?>