我正在尝试创建一个用于管理员注册的表单。该代码工作正常，但不止一个管理员可以注册此页面。我怎样才能做到只有一个管理员可以注册？
<html >
<head>
<title></title>
</head>
<body>
<?php
print ("<form action='admin.php' method='post'>
<p>Name
<input type='text' name='firstname' />
</p>
<p>Surname
<input type='text' name='lastname' />
</p>
<p>Username
<input type='text' name='username' />
</p>
<p>Password
<input type='password' name='password' />
</p>
<p>Email <input type='text' name='email'/> </p>
<input type='submit' value='Register'/>
</form>
");
if( !($database=mysql_connect("localhost","root",""))||!(mysql_select_db("st_login",$database)) )
print("Could not connect");
if(isset($_POST['firstname'] )&&isset($_POST['lastname'])&&isset($_POST['username'])&&isset($_POST['password'])
/*&&isset($_POST['notat'])&&isset($_POST['lendet'])*/&&isset($_POST['email'])){
$firstname=$_POST['firstname'];
$lastname=$_POST['lastname'];
$username=$_POST['username'];
$password=md5($_POST['password']);
$email=$_POST['email'];
/*
$notat=$_POST['notat'];
$lendet=$_POST['lendet'];
*/
$query = "INSERT INTO login (firstname, lastname, username,password,email,admin) VALUES ('$firstname', '$lastname',
'$username','$password','$email',1)";
}
if ( !empty($firstname)&&!empty($lastname)&&!empty($username) &&!empty($password)&&!empty($email))
{
if(!($result=mysql_query($query,$database)))
{
print("Could not execute query");
die (mysql_error());//ose error
}
echo "YOU HAVE BEEN REGISTERED SUCCESSFULLY!You are the admin of this page";
}
else echo 'Fill in all the blank fields';
mysql_close($database);
?>
</body>
</html>
最佳答案
在表单中输入用户数据时添加勾选。检查是否有任何行的字段 admin 设置为 1(或您使用的任何内容)
示例代码
$result = mysql_query("SELECT firstname FROM mytable WHERE admin=1");
if(mysql_num_rows($result)== 0) {
//check if the post variables are set and input the values to the table
} else {
// Admin already exist
}
如评论中所述，您应该停止使用mysql_，而使用mysqli_ 或带有prepared statements 的PDO，示例如下.请记住，您不能混合使用 API，因此您的整个代码必须从一个转换为另一个。
$mysqli = new mysqli("host", "user", "password", "database");
$result = $mysqli->query("SELECT firstname FROM mytable WHERE admin=1");
if ($result->num_rows == 0)
//check if the post variables are set and input the values to the table
} else {
// Admin already exist
}
引用
关于PHP - 页面只允许一个管理员注册，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34836802/