รบกวนหน่อยครับ พอดีว่าอยากทราบว่า foreach ใช้วนลูปยังไงครับ

<?php 
@session_start();
include ('theme_admin.php');
require_once("connect.php") ;
//include ('session.php');
//include ('navbar_admin.php');
?>


<div class="container">
  <div class="row">
    <div class="box">
      <div class="col-md-6 col-md-offset-3 text-center">
        <h3>เพิ่มข้อมูลห้อง</h3>
        <div class="panel panel-primary">
          <div class="panel-body">
            <form action="form_insert_room_equipment.php?id_equipment=<?=$rows["id_equipment"];?>" method="POST" target="_blank" class="form-horizontal" name="frmMain" onSubmit="Javascript:return fncSubmit();">


              <?php
              $sql = "SELECT * FROM `bk_equipment` WHERE `status`=1";

              $query = $mysqli->query($sql);
              $num_rows = mysqli_num_rows($query);
              $num_rows1 = $num_rows
              ?>



              <div class="form-group" align="center">
                <label align = "center" for="id_equipment" class="col-sm-4 control-label">อุปกรณ์ภายในห้อง</label>
              </div> 

              <div class="form-group">
                <label for="idroom" class="col-sm-4 control-label">ห้อง</label>
                <div class="col-sm-6">
                  <select id="idroom" name="idroom" class="form-control" placeholder="ระบุ ห้อง">     
                    <?php
                    $strSQL = "SELECT * FROM bk_room_details WHERE idroom Not in (SELECT idroom FROM bk_room_equipment WHERE idroom = idroom )";
                    $objQuery=$mysqli->query($strSQL); 
                    while($objResuut = mysqli_fetch_array($objQuery))
                    {

                      ?>
                      <option value="<?php echo $objResuut["idroom"];?>" ><?php echo $objResuut["room_name"];?></option>
                      <?php
                    }
                    ?>
                  </select>
                </div>
              </div> 



              <div class="table-responsive">
                <table class="table table-hover table-bordered">
                  <thead>
                    <tr bgcolor="#0083CA">
                      <td width="100" align="center"><font color="#FFFFFF">อุปกรณ์ในห้อง          </font></td>
                      <td width="100" align="center"><font color="#FFFFFF">สถานะ          </font></td> 
                    </tr>
                  </thead>

                  <?php
                  if($num_rows1 == 0){$num_rows1=1;}
                  for($i=1;$i<=$num_rows1;$i++)

                    while ($rows = mysqli_fetch_array($query))
                    {

                      ?>
                      <tr bgcolor="#EEEEEE">
                        <td><input type="text" name="id_equipment[]" class="form-control" id="id_equipment" value="<?php echo"$rows[id_equipment]";?>" readonly></td>
                        <td><select id="id_status_em" name="id_status_em[]" class="form-control" placeholder="เจ้าหน้าที่ดูแลห้อง">

                          <?php
                          $strSQL = "SELECT * FROM `bk_equipment_status` ORDER BY `id_status_em` ASC";
                          $objQuery=$mysqli->query($strSQL); 
                          while($objResuut = mysqli_fetch_array($objQuery))
                          {

                            ?>
                            <option value="<?php echo $objResuut["id_status_em"];?>"><?php echo $objResuut["status_name"];?></option>
                            <?php
                          }
                          ?>
                        </select></td>

                        <?php
                      }

                      ?>
                    </table>

                  </div>



                  <div class="form-group">
                    <div class="col-sm-offset-1">
                      <input type="submit" name="submit" value="ตกลง" class="btn btn-success">
                      <span type="submit" name="button2" id="button2" class="btn btn-danger" onclick="window.location.href='admin_room.php'">ยกเลิก</span>

                    </div>
                  </div>
                </form>



              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
    <?php
    include ('footer.php');
    ?>

require_once("connect.php");
$idroom = $_POST['idroom'];  
//$id_equipment = $_POST['id_equipment'];  
//echo $id_equipment;

// print array ออกมาดู
print_r($_POST);
 
foreach($_POST['id_equipment'] as $row=>$art)
foreach($_POST['id_status_em'] as $row=>$art)

{ 
$id_equipment = mysql_real_escape_string($_POST['id_equipment'][$row]);
$id_status_em = mysql_real_escape_string($_POST['id_status_em'][$row]);

 
$sql = "insert into bk_room_equipment (idroom,id_equipment,id_status_em) values ('$idroom','$id_equipment','$id_status_em') ";
 
$result = mysqli_query($mysqli, $sql) or die ("Error in query: $sql " . mysqli_error());
 

} 
mysqli_close($mysqli);