How do I process form checkbox into mysql? - php

Question

I want to get the selected values from the processed into my database? How can Achieve that?
I'm just getting one result stored into the database. My goal is that each user can do a multiple selection from a list of receipts numbers under their accounts and then when they submit the request I want to get the selected receipt numbers in the database.
here is my form.
<form action="" method="post">
<div class="modal-body">
<div class="row">
<div class="col-md-12">
<div class="form-group">
<label for="warehouse"><p><b><i class="fa fa-folder-open-o"></i> Selecciona a continuación los recibos de bodega que deseas enviar :</b></p></label><br>
<?php
// Get the Client List
$qry4 = "SELECT
projectId,
clientId,
projectName,
store,
projectDeatils
FROM
clientprojects
WHERE clientId = ".$clientId."";
$res4 = mysqli_query($mysqli, $qry4) or die('-4'.mysqli_error());
while ($d = mysqli_fetch_assoc($res4)) {
?>
<input type="checkbox" name="warehouse" value="<?php echo $d['projectName']; ?>" >
<?php echo clean($d['store']); ?> | <a target="_blank" href="index.php?page=viewProject&projectId=<?php echo clean($d['projectId']); ?>" data-toggle="tooltip" data-placement="right" title="Ver En Detalle">
<?php echo clean($d['projectName']); ?></a>
: <a data-toggle="tooltip" data-placement="right" title="<?php echo clean($d['projectDeatils']); ?>"> <?php echo ellipsis($d['projectDeatils'],50); ?></a><br>
<?php } ?>
</div>
</div>
</div>
</div>
<div class="modal-footer">
<button type="input" name="submit" value="requestShipment" class="btn btn-success btn-icon"><i class="fa fa-check-square-o"></i> <?php echo $reqQuoteBtn; ?></button>
<button type="button" class="btn btn-default btn-icon" data-dismiss="modal"><i class="fa fa-times-circle-o"></i> <?php echo $cancelBtn; ?></button>
</div>
Here is my database connection:
// New shipment Request
if (isset($_POST['submit']) && $_POST['submit'] == 'requestShipment') {
// Validation
if($_POST['warehouse'] == "") {
$msgBox = alertBox($projTitleReq, "<i class='fa fa-times-circle'></i>", "danger");
} else if($_POST['shipmentAddress'] == "") {
$msgBox = alertBox($addressStreetWarning, "<i class='fa fa-times-circle'></i>", "danger");
} else {
$warehouse = $_POST['warehouse'];
$shipmentAddress = $_POST['shipmentAddress'];
$requestDate = date("Y-m-d H:i:s");
$stmt = $mysqli->prepare("
INSERT INTO
shipmentrequest(
clientId,
warehouse,
shipmentAddress,
requestDate
) VALUES (
?,
?,
?,
?
)");
$stmt->bind_param('ssss',
$clientId,
$warehouse,
$shipmentAddress,
$requestDate
);
}
}