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14 years ago
It's often faster to use a foreache and array_keys than array_unique:



    <?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



    ?>
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