我正在尝试使用不同的变量一个接一个地执行多个选择查询。所有查询仅用于 Pincode 的查询显示结果其余显示 - 注意：尝试访问 null in 类型值的数组偏移量
我是 PHP 新手。谢谢你提前指导我
<?php
include 'connection.php';
include 'eMembersHome.php';
include 'common.php';
$muname = $_SESSION['muname'];
$sql = "Select * from membersprofile where muname = '$muname'";
$result = mysqli_query($con,$sql);
$row = mysqli_fetch_assoc($result);
$mfname = $row['mfname'];
$mlname = $row['mlname'];
$ftname = $row['ftname'];
$mdob = $row['mdob'];
$maddress = $row['maddress'];
$muname = $row['muname'];
$mpassword = $row['mpassword'];
$marea = $row['marea'];
$mlandmark = $row['mlandmark'];
$mcity = $row['mcity'];
$mstate = $row['mstate'];
$mpincode = $row['mpincode'];
$mcountry = $row['mcountry'];
$sql4 ="select cname from country where sno = '$mcountry'";
$res4=mysqli_query($con,$sql4);
$data4=mysqli_fetch_assoc($res4);
$sql1 = "select sname from states where ssno = '$mstate'";
$res1=mysqli_query($con,$sql1);
$data=mysqli_fetch_assoc($res1);
$query = "select ctname from cities where ctsno = '$mcity'";
$rescity=mysqli_query($con,$query);
$datacity=mysqli_fetch_assoc($rescity);
$sql3 = "select pincode,area from pincode where psno = '$mpincode'";
$res3=mysqli_query($con,$sql3);
$data2=mysqli_fetch_assoc($res3);
?\>