PHPGangsta: Doppelte Array-Einträge entfernen

test.php

<?php

if (extension_loaded('xdebug')) {
    echo "WARNING: xdebug is enabled\n";
}


function _count()
{
    $array = array(1, 5, 8, 'Michael', 5, 4, 9, 'Martin', 18, 12, 'Michael', 4, 12);
    $counts = array_count_values($array);

    foreach ($counts as $value => $counter) {
        if ($counter > 1) {
            unset($counts[$value]);
        }
    }

    $v = array_keys($counts);

}

function _diff()
{
    $array = array(1, 5, 8, 'Michael', 5, 4, 9, 'Martin', 18, 12, 'Michael', 4, 12);
    $v = array_diff($array, array_diff_assoc($array, array_unique($array)));
}

function _foreach()
{
    $array = array(1, 5, 8, 'Michael', 5, 4, 9, 'Martin', 18, 12, 'Michael', 4, 12);
    $index = array();
    $duplicate = array();
    foreach ($array as $i => $a) {
        if (isset($index[$a])) {
            unset($array[$index[$a]]);
            unset($array[$i]);
            unset($index[$a]);
            $duplicate[$a] = true;
            continue;
        }

        if (isset($duplicate[$a])) {
            unset($array[$i]);
            continue;
        }

        $index[$a] = $i;
    }

    $v = $array;
}

function _filter()
{
    $array = array(1, 5, 8, 'Michael', 5, 4, 9, 'Martin', 18, 12, 'Michael', 4, 12);
    $v = array_keys(
        array_filter(
            array_count_values($array), function ($val) {
                return $val > 1 ? false : true;
            }
        )
    );
}

$data = array();
$functions = array(
    '_count',
    '_diff',
    '_foreach',
    '_filter',
);

$res = array();
$mem = array();
foreach( $functions as $k )
{
    $iterations = 3;
    $rest = array();
    $t = memory_get_usage();
    //ob_start();
    $start = microtime(true);
    while (--$iterations) {
        $k();
    }
    $end = microtime(true);
    //ob_get_clean();
    $res[$k] = $end - $start;
    $mem[$k] = (memory_get_usage() - $t) / 1024;
}

echo "results, fastest first:\n";
asort($res);
foreach ($res as $k => $d) {
    printf("%-20s %0.10f %0.4f\n", $k, $d, $mem[$k]);
}