<div class="form-B"
<input class="form-control" placeholder="Name of the Company" name="ven_name" type="text" autofocus >
<input class="form-control" placeholder="Address" name="address" type="text" autofocus >
<input class="form-control" placeholder="City" name="city" type="text" autofocus >
</div>


<div class="form-B">
<input type="text" name="usr_f_name[]" placeholder="First Name" />
<input type="text" name="usr_l_name[]" placeholder="Last Name" />
<input type="text" name="usr_mobile[]" placeholder="Mobile Number" />
<input type="text" name="usr_email[]" placeholder="Email" />
<input type="password" name="usr_password_1[]" placeholder="Password"/>
</div>

$usr_array = array_keys($_POST['']);
    foreach ($id_array as $id) {
        $usr_f_name =  mysqli_real_escape_string ($_POST['usr_f_name'][$id]);
        $usr_l_name =  mysqli_real_escape_string ($_POST['usr_l_name'][$id]);
        $usr_mobile =  mysqli_real_escape_string ($_POST['usr_mobile'][$id]);
        $usr_email =  mysqli_real_escape_string ($_POST['usr_email'][$id]);
        $usr_password_1 =  md5 ($_POST['usr_password_1'][$id]);



$sql = "INSERT INTO table_b SET f_name = '$usr_f_name', l_name = '$usr_l_name', mobile  ='$usr_mobile',username='$usr_email', email='$usr_email', password='$usr_password_1'";
        }
        if(mysqli_query($databaseLink, $sql)){
            echo "Records added successfully.";
        } else{
            echo "ERROR: Could not able to execute $sql. " . mysqli_error($databaseLink);
        }
    }