Как да вмъкна множество масиви в база данни?

Добре след няколко проби и грешки и малко помощ от @Rizier123, ето отговора:

html на страницата с формуляр

За по-голяма яснота се опитвах да разбера как да добавя няколко масива от данни към моя db. Така че на страницата с динамичен формуляр имам входове, подобни на:

<p>Location: <input type='text' name='location[]'  > </p>

Обработка на формуляра и въвеждане на данните в БД

Първо превключих от mysqli към PDO, след което стартирах със следния код:

try {
        $sql = "INSERT INTO location_info (`department`, `participant`, `activity`, `location`, `rec_injuries`, `rec_injuries_timeframe`, `non_rec_injuries`, `non_rec_injuries_timeframe`, `competitor`, `cost_per_pair`, `usage_rate`, `leakage`, `cost_of_productivity`, `non_rec_impact`, `non_rec_sprain`, `non_rec_puncture`, `non_rec_dermatitis`, `non_rec_infection`, `non_rec_burns`, `non_rec_cuts`, `rec_impact`, `rec_sprain`, `rec_puncture`, `rec_dermatitis`, `rec_infection`, `rec_burns`, `rec_cuts`, `condition`, `general_id`)
        VALUES (:department, :participant, :activity, :location, :rec_injuries, :rec_injuries_timeframe, :non_rec_injuries, :non_rec_injuries_timeframe, :competitor, :cost_per_pair, :usage_rate, :leakage, :cost_of_productivity,:non_rec_impact, :non_rec_sprain, :non_rec_puncture, :non_rec_dermatitis, :non_rec_infection, :non_rec_burns, :non_rec_cuts, :rec_impact, :rec_sprain, :rec_puncture, :rec_dermatitis, :rec_infection, :rec_burns, :rec_cuts, :condition, '{$id}')";

        $stmt = $db->prepare($sql);

for($i = 0, $l = count($_POST["department_name"]); $i < $l; $i++) { 

    $loc_info = array(':department' => $_POST["department_name"][$i],
                        ':participant' => $_POST["participant_name"][$i],
                        ':activity' => $_POST["activity"][$i],
                        ':location' => $_POST["location"][$i],
                        ':rec_injuries' => $_POST["injuries"][$i],
                        ':rec_injuries_timeframe' => $_POST["injury_time_frame"][$i],
                        ':non_rec_injuries' => $_POST["non_rec_injuries"][$i],
                        ':non_rec_injuries_timeframe' => $_POST["non_rec_injury_timeframe"][$i],
                        ':competitor' => $_POST["competitor"][$i],
                        ':cost_per_pair' => $_POST["cost_per_pair"][$i],
                        ':usage_rate' => $_POST["usage_rate"][$i],
                        ':leakage' => $_POST["leakage"][$i],
                        ':cost_of_productivity' => $_POST["cost_of_productivity"][$i],
                        ':non_rec_impact' => $_POST["non_rec_impact"][$i],
                        ':non_rec_sprain' => $_POST["non_rec_sprain"][$i],
                        ':non_rec_puncture' => $_POST["non_rec_puncture"][$i],
                        ':non_rec_dermatitis' => $_POST["non_rec_dermatitis"][$i],
                        ':non_rec_infection' => $_POST["non_rec_infection"][$i],
                        ':non_rec_burns' => $_POST["non_rec_burns"][$i],
                        ':non_rec_cuts' => $_POST["non_rec_cuts"][$i],
                        ':rec_impact' => $_POST["impact"][$i],
                        ':rec_sprain' => $_POST["sprain"][$i],
                        ':rec_puncture' => $_POST["puncture"][$i],
                        ':rec_dermatitis' => $_POST["dermatitis"][$i],
                        ':rec_infection' => $_POST["infection"][$i],
                        ':rec_burns' => $_POST["burns"][$i],
                        ':rec_cuts' => $_POST["cuts"][$i],
                        ':condition' => $_POST["condition"][$i] );

$stmt->execute($loc_info);
}