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<select name="user_id" required="" class="form-control" id="user_id">
    <option value=""></option>
    <?php
    foreach ($users as $user) {
    ?>
        <option value="<?= $user["user_id"]."|".$user["email"]."|".$user["fullname"] ?>"><?= $user["fullname"] ?></option>
    <?php
    }
    ?>
</select>