Php Programming Code Examples
Php > Authentication Code Examples
Complete, simple working example of login screen and check on a unique
Complete, simple working example of login screen and check on a unique
page using php functions, cookies and mysql database.
<?php
if (!$mysql_login) {
// check if $username and $password are passed through as query string
if($username && $password) {
include("./dbConn.php3");
// If you want to have the passwords in the databases crypted.
$password = md5($password);
$loc="Location: http://$SERVER_NAME$SCRIPT_NAME";.
$sql = "select Password from users_t where Username='$username'";
$r = mysql_db_query($db,$sql);
//check if the result of the query has at least one row.Or it will redirect the page.
if(!mysql_num_rows($r)) header($loc);
$user = mysql_fetch_array($r);
if($user["Password"] == $password) {
//note the space between the username and the passoword. It will be
//used below to slice the cookie.
setcookie("mysql_login","$username $password");
$msg = "<meta http-equiv=\"Refresh\" content=\"0;url=$SCRIPT_NAME\">";
//The use of the http header is inconsistent with many browser if you have
//already setted a cookie. So, after the setcookie command the script uses
//the meta tag to obtain the same result.
}else{
header($loc);
}
}else{
?>
<html>
<title>Login to PHP Coders DB</title>
<body bgcolor="yellow" text="black">
<form method="post" action="<?php echo($SCRIPT_NAME)?>">
<center><font size=+5><b>Welcome!</b></font></center>
<br><br><br>
<table cellspacing=0 cellpadding=0 width=320 align="center">
<tr><td>Username:</td><td>
<tr><td><input name="username" type="text" width=10></td></tr>
<tr><td>Password: </td><td>
<tr><td><input name="password" type="password" width=10></td></tr>
<tr><td colspan=2 align="center"><input name="login" type="submit"></td></tr>
</form>
</table>
<body>
</html>
<?php
die(); //This will prevent PHP from showing actual page. See above.
}
}else{
//include("./dbConn.php3");
$chk=0;
// Set an array called $user with the contents of the cookie
//sliced at the space between username and password, see above.
$user = explode(" ","$mysql_login");
$sql = "select Password from users_t where username='$user[0]'";
$r = mysql_db_query($db,$sql);
//check if the result of the query has at least one row.Or it set the $chk variable.
if(!mysql_num_rows($r)) $chk=1;
$chkusr = mysql_fetch_array($r);
if ($user[1]!=$chkusr["Password"]) $chk=1;
if ($chk) {
// To reset the cookie, the setcookie function is used here without argoument.
setcookie("mysql_login");
// see above.
echo("<meta http-equiv=\"Refresh\" content=\"0;url=$SCRIPT_NAME\">");
}
}
//After here the actual page starts and only registered user can see it.
?>
