Login Login Instance Code _php instance in PHP

This example for you to share the PHP login login specific implementation code for your reference, the specific content as follows

 <?php require". 
/include/dbclass.php "; 
$username =$_post[' username ']; 
$password =$_post[' password ']; if (Empty ($username) | | empty ($password)) {go_msg ("Please fill in username, password!") ",".. 
 /default.html "); 
 Exit 
} dbconn (); 
$password =md5 ($password); $SQL = "Select Username,usertype,userpass from SiteUser where Username= '". $username. "' and userpass= '". $password. 
"' and Isopen=1 '; 
echo "$SQL"; 
 $result = $db-> exec_sql ($SQL); 
 $total =mysql_num_rows ($result); 
 if ($total ==0) {dbclose (); Go_msg ("Registered user has not been audited by admin or username and password!") Please re-enter! ",".. 
 /default.html "); 
 Exit 
 }else{$Rs = $db-> fetch_array ($result); 
 Attached value, and login Session_register ("username"); 
 Session_register ("usertype"); 
 $_session["Usertype"]= $Rs [' usertype ']; 
 $_session["username"]= $username; 
 echo $_session["username"]; if ($_session["usertype"]==1) {go_msg ("Landing success!") 

  "," default.php "); 
 Header (' location:http://163.com '); } if ($_session["usertype"]==2) {go_msg ("Login successful!") ",".. /User2/default_1.php "); } if ($_session["usertype"]==3) {go_msg ("Login successful!") ",".. 
 /user3/default_2.php "); 
 }//Header (' Location:default.php '); 
} dbclose (); Why ask Hovertree.com?> 

The above is the entire content of this article, I hope that you learn PHP program help.