我已经从（例如从w3schools.com开始）进行了注册，他们$_SERVER["PHP_SELF"]在表格法中使用了。
$_SERVER["PHP_SELF"] 这有助于验证部分，但不允许将数据插入db。
我也为手机号码编写了代码。只能插入数字但不能使用的地方。请帮忙。
<html>
<head>
<title>Meeting Room Application</title>
</head>
<body>
<?php
// define variables and set to empty values
$nameErr = $emailErr = $genderErr = $mobErr = $uidErr = $pwdErr = $roleErr = "";
$txtname = $gender = $txtmob = $txteid = $txtuid = $txtpwd = $role = "";
if($_SERVER["REQUEST_METHOD"] == "POST") {
if(empty($_POST["txtname"])) {
$nameErr = "Name is required";
} else {
$txtname = test_input($_POST["txtname"]);
// check if name only contains letters and whitespace
if(!preg_match("/^[a-zA-Z ]*$/", $txtname)) {
$nameErr = "Only letters and white space allowed";
}
}
if(empty($_POST["txteid"])) {
$emailErr = "Email is required";
} else {
$txteid = test_input($_POST["txteid"]);
// check if e-mail address is well-formed
if(!filter_var($txteid, FILTER_VALIDATE_EMAIL)) {
$emailErr = "Invalid email format";
}
}
if(empty($_POST["gender"])) {
$genderErr = "Gender is required";
} else {
$gender = test_input($_POST["gender"]);
}
if(empty($_POST["txtmob"])) {
$mobErr = "Mobile is required";
} else {
$txtmob = test_input($_POST["txtmob"]);
//check only numbers are given
if(preg_match("/^d{10}$/", $txtmob)) {
$mobErr = "Only numbers are allowed";
}
}
if(empty($_POST["txtuid"])) {
$uidErr = "User Id is required";
} else {
$txtuid = test_input($_POST["txtuid"]);
}
if(empty($_POST["txtpwd"])) {
$pwdErr = "Password is required";
} else {
$txtpwd = test_input($_POST["txtpwd"]);
}
if(empty($_POST["role"])) {
$roleErr = "Role is required";
} else {
$role = test_input($_POST["role"]);
}
}
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
<table align="center" cellpadding="5" cellspacing="5">
<tr>
<th colspan="2"><img src="Hitech Logo1.png" alt="HiTech"></th>
</tr>
<tr>
<th colspan="2"><h1>User Registration</h1></th>
</tr>
<tr>
<td colspan="2" align="left"><font color="red">All fields are mandatory</font></td>
</tr>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
<tr>
<td>Full Name : </td>
<td><input type="text" name="txtname" value="<?php echo $txtname ?>"> <font color="red"><?php echo $nameErr; ?></td>
</tr>
<tr>
<td>Gender : </td>
<td><input type="radio" name="gender" <?php if(isset($gender) && $gender == "Male") echo "checked"; ?> value="Male">Male
<input type="radio" name="gender" <?php if(isset($gender) && $gender == "Female") echo "checked"; ?> value="Female">Female
<font color="red"><?php echo $genderErr; ?>
</td>
</tr>
<tr>
<td>Mobile No. : (+91)</td>
<td><input type="text" name="txtmob" maxlength="10" value="<?php echo $txtmob ?>">
<font color="red"><?php echo $mobErr; ?>
</td>
</tr>
<tr>
<td>Email Id : </td>
<td><input type="text" name="txteid" value="<?php echo $txteid ?>">
<font color="red"><?php echo $emailErr; ?>
</td>
</tr>
<tr>
<td>User Id : </td>
<td><input type="text" name="txtuid" value="<?php echo $txtuid ?>">
<font color="red"><?php echo $uidErr; ?>
</td>
</tr>
<tr>
<td>Password : </td>
<td><input type="password" name="txtpwd" value="<?php echo $txtpwd ?>">
<font color="red"><?php echo $pwdErr; ?>
</td>
</tr>
<tr>
<td>Role : </td>
<td><input type="radio" name="role" <?php if(isset($role) && $role == "User") echo "checked"; ?> value="User">User
<input type="radio" name="role" <?php if(isset($role) && $role == "Admin") echo "checked"; ?> value="Admin">Admin
<font color="red"><?php echo $roleErr; ?>
</td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="Submit" name="btnsave">
</td>
</tr>
</form>
</tr>
</table>
<?php
$host = "localhost"; // Host name
$username = "root"; // Mysql username
$password = ""; // Mysql password
$db_name = "testmra"; // Database name
// Connect to server and select databse.
$conn = mysqli_connect($host, $username, $password) or die("cannot connect");
mysqli_select_db($conn, $db_name);
$name = mysqli_real_escape_string($conn, $_POST['txtname']);
$gender = mysqli_real_escape_string($conn, $_POST['gender']);
$mobile = mysqli_real_escape_string($conn, $_POST['txtmob']);
$email = mysqli_real_escape_string($conn, $_POST['txteid']);
$username = mysqli_real_escape_string($conn, $_POST['txtuid']);
$userpass = mysqli_real_escape_string($conn, $_POST['txtpwd']);
$role = mysqli_real_escape_string($conn, $_POST['role']);
$res = mysqli_query($conn, "SELECT username FROM trialusers WHERE username='$username'");
$row = mysqli_fetch_row($res);
if($row > 0) {
echo "Username $username has already been taken";
} else {
$sql = "INSERT INTO newuser (name,gender,contactno,emailid,username,userpass,role)VALUES('$name','$gender','$mobile','$email','$username','$userpass','$role')";
if(mysqli_query($conn, $sql)) {
header("location:registration.php");
} else {
die('Error: Cannot connect to db');
}
}
?>
</body>
</html>
将代码的最后部分更改为此：
<?php
if(!empty($_POST)){
$host="localhost"; // Host name
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name="testmra"; // Database name
// Connect to server and select databse.
$conn=mysqli_connect($host,$username,$password) or die("cannot connect");
mysqli_select_db($conn,$db_name);
$name = mysqli_real_escape_string($conn, $_POST['txtname']);
$gender = mysqli_real_escape_string($conn, $_POST['gender']);
$mobile = mysqli_real_escape_string($conn, $_POST['txtmob']);
$email = mysqli_real_escape_string($conn, $_POST['txteid']);
$username = mysqli_real_escape_string($conn, $_POST['txtuid']);
$userpass = mysqli_real_escape_string($conn, $_POST['txtpwd']);
$role= mysqli_real_escape_string($conn, $_POST['role']);
$res=mysqli_query($conn,"SELECT username FROM trialusers WHERE username='$username'");
$row=mysqli_fetch_row($res);
if($row>0)
{
echo "Username $username has already been taken";
}
else
{
$sql="INSERT INTO newuser (name,gender,contactno,emailid,username,userpass,role)VALUES('$name','$gender','$mobile','$email','$username','$userpass','$role')";
if (mysqli_query($conn,$sql))
{
header("location:registration.php");
}
else
{
die('Error: Cannot connect to db' );
}
}
}
?>
仅当您实际从表单中发布数据时，这才触发数据插入部分，并消除看到的错误。顺便说一句，您正在使用的代码已过时，并使用了已弃用的mysql库。请考虑更新PDO
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