PHP/Login Authentication/User Registration

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Adding a User

 
<html>
<body>
<?php
$self = $_SERVER["PHP_SELF"];
$firstname = $_POST["firstname"];
$lastname = $_POST["lastname"];
$username = $_POST["username"];
$password = $_POST["password"];
if( (!$firstname) or (!$lastname) or (!$username) or (!$password) )
{
  $form ="Please enter all new user details...";
  $form.="<form action=\"$self\"";
  $form.=" method=\"post\">First Name: ";
  $form.="<input type=\"text\" name=\"firstname\"";
  $form.=" value=\"$firstname\"><br>Last Name: ";
  $form.="<input type=\"text\" name=\"lastname\"";
  $form.=" value=\"$lastname\"><br>User Name: ";
  $form.="<input type=\"text\" name=\"username\"";
  $form.=" value=\"$username\"><br>Password: &nbsp; ";
  $form.="<input type=\"text\" name=\"password\"";
  $form.=" value=\"$password\"><br>";
  $form.="<input type=\"submit\" value=\"Submit\">";
  $form.="</form>";
  echo($form);
}
else
{
  $conn = @mysql_connect("localhost","root", "") or die("Could not connect to MySQL");
  $db = @mysql_select_db("my_database",$conn) or die("Could not select database");
  $sql = "insert into users (first_name,last_name,user_name,password)values (\"$firstname\",\"$lastname\",\"$username\",password(\"$password\") )";
  $result = @mysql_query($sql,$conn)or die("Could not execute query");
  if($result){ 
    echo("New user $username added"); 
  }
}
?>
</body></html>



A user registration process

 
create table user_info (
user_id char(18),
fname char(15),
email char(35));

//File: index.php
<?
$form = "
<form action=\"index.php\" method=\"post\">
<input type=\"hidden\" name=\"seenform\" value=\"y\">
Your first name?:<br>
<input type=\"text\" name=\"fname\" value=\"\"><br>
Your email?:<br>
<input type=\"text\" name=\"email\" value=\"\"><br>
<input type=\"submit\" value=\"Register!\">
</form>
";
if ((! isset ($seenform)) && (! isset ($userid))) :
     print $form;
elseif (isset ($seenform) && (! isset ($userid))) :
     $uniq_id = uniqid(rand());
     @mysql_pconnect("localhost", "root", "") or die("Could not connect to MySQL server!");
     @mysql_select_db("user") or die("Could not select user database!");
     $query = "INSERT INTO user_info VALUES("$uniq_id", "$fname", "$email")";
     $result = mysql_query($query) or die("Could not insert user information!");
     setcookie ("userid", $uniq_id, time()+2592000);
     print "Congratulations $fname! You are now registered!.";
elseif (isset($userid)) :
     @mysql_pconnect("localhost", "root", "") or die("Could not connect to MySQL server!");
     @mysql_select_db("user") or die("Could not select user database!");
     $query = "SELECT * FROM user_info WHERE user_id = "$userid"";
     $result = mysql_query($query) or die("Could not extract user information!");
     $row = mysql_fetch_array($result);
     print "Hi ".$row["fname"].",<br>";
     print "Your email address is ".$row["email"];
endif;
?>
Источник — «http://wbex.ru/index.php?title=PHP/Login_Authentication/User_Registration&oldid=916»