- microtime: documentation ( source)
- array_merge: documentation ( source)
- array_keys: documentation ( source)
- array_unique: documentation ( source)
- range: documentation ( source)
<?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 32.300781965256
$time = -microtime(true);
$res2 = array();
foreach($arr as $key=>$val) {
$res2[$val] = true;
}
$res2 = array_keys($res2);
$time += microtime(true);
echo "<br />deduped to ".count($res2)." in ".$time;
// deduped to 666667 in 0.84372591972351