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// unique array by field
// http://stackoverflow.com/questions/6422562/php-unique-array-by-value/6422636#6422636

foreach($array as $item){
  $hash = $item["alias"];
  $unique_array[$hash] = $item;
}

// How can you make a multidimensional array unique?
// http://stackoverflow.com/questions/4585208/how-can-you-make-a-multidimensional-array-unique/24568871#24568871

function array_unique_by_key (&$array, $key) {
    $tmp = array();
    $result = array();
    foreach ($array as $value) {
        if (!in_array($value[$key], $tmp)) {
            array_push($tmp, $value[$key]);
            array_push($result, $value);
        }
    }
    return $array = $result;
}