Det här exemplet borde hjälpa dig lite, men jag rekommenderar att du använder mysqli och det är en riktigt dålig idé att lagra dina lösenord i vanlig text. Du bör överväga att leta upp mysqli, hasha lösenord och börja bekanta dig med php 5.4 eftersom många av funktionerna som används här HAR ändrats och inte längre stöds.
checklogin.php
<?php
$host="host"; // Host name
$username="username"; // Mysql username
$password="password"; // Mysql password
$db_name="database"; // Database name
$tbl_name="table"; // Table name
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
// username and password sent from form
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];
// Remove Magic Quotes
if (get_magic_quotes_gpc()){
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
}
$sql = sprintf(
"SELECT * FROM $tbl_name WHERE username='%s' and password='%s' LIMIT 1;",
mysql_real_escape_string($myusername),
mysql_real_escape_string($mypassword)
);
$result = mysql_query($sql);
// MySQL count
$count = mysql_num_rows($result);
if ($count){
$_SESSION['username'] = $myusername; // $_SESSION['loggedin'] = true or false would work too
$_SESSION['mypassword'] = $mypassword; // Why store the password in session data?
header("Location: login_success.php");
}else{
header("Location: main_login.php?msg=Login_Failed");
}
?>
login_success.php
<?php
session_start();
if (!isset($_SESSION['username']) || empty($_SESSION['username']){
header("Location: mail_login.php");
}
?>
<html>
<body>
Welcome <?php echo $_SESSION['username']; ?>
Login Successful
</body>
</html>
main_login.php
<?php
if (isset($_GET['msg']) && !empty($_GET['msg']) echo $_GET['msg'];
?>
<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form name="form1" method="post" action="checklogin.php">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td colspan="3"><strong>Member Login </strong></td>
</tr>
<tr>
<td width="78">Username</td>
<td width="6">:</td>
<td width="294"><input name="myusername" type="text" id="myusername"></td>
</tr>
<tr>
<td>Password</td>
<td>:</td>
<td><input name="mypassword" type="text" id="mypassword"></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td><input type="submit" name="Submit" value="Login"></td>
</tr>
</table>
</td>
</form>
</tr>
</table>
Använd på egen risk. :)