[英]Validate the username in Edit form while id is gone when the Edit form is submitted
require_once "../config.php";
#Editing user's Id
if(isset($_GET['id'])){
$id = $_GET['id'];
$queryT = "SELECT * FROM teachers WHERE t_id = $id";
$results = mysqli_query($link, $queryT);
$myRow = mysqli_fetch_array($results);
}
$userName = htmlspecialchars($_POST['username']);
if(isset($_POST['submit'])){
if(empty($userName)){
$userNameErr = "<span>Username is required!.</span>";
}elseif($rowcount == 1 AND $userName != $myRow['username']){
$userNameErr = "<span>That username is taken!.</span>";
}
it all went well but when i submit the edited form the previous Get id fades and $myRow['username'] becomes undefined variable 一切顺利,但是当我提交编辑的表单时,以前的“获取ID”消失,$ myRow ['username']变为未定义变量
You can test whether the index is set with if (isset($myRow['username'])) 您可以测试是否使用if(isset($ myRow ['username']))设置索引
And you should always declare a variable in the scope that you want to use it. 而且,您应该始终在要使用的范围内声明变量。 Php is not strict so that means you have to be.
Php并不严格,因此您必须做到。
$myRow = [];
if(isset($_GET['id'])){
$id = $_GET['id'];
$queryT = "SELECT * FROM teachers WHERE t_id = $id";
$results = mysqli_query($link, $queryT);
$myRow = mysqli_fetch_array($results);
}
To preserve the get variable you can store it in a hidden field of your form and do something like 要保留get变量,可以将其存储在表单的隐藏字段中,并执行类似的操作
$id = (isset($_GET['id'])
? $_GET['id']
: isset($_POST['id'])
? $_POST['id']
: 0;
if($id !== 0){
$queryT = "SELECT * FROM teachers WHERE t_id = $id";
$results = mysqli_query($link, $queryT);
$myRow = mysqli_fetch_array($results);
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.