<?php

	class Login{

		private $Table;

		private $Structure;

		

		function __construct($Table="", $Structure=""){

			$this->Table = ($Table) ? $Table : "accounts";

			$this->Structure = ($Structure) ? $Structure : Array("name", "password", "salt");

		}

		

		function __destruct(){

			unset($this->Table);

			unset($this->Structure);

			unset($this);

		}

		

		function Login($Username, $Password){

			global $MySQL;

			

			$Username = $MySQL->Escape($Username);

			$Password = $MySQL->Escape($Password);

			

			$MySQL->Query("SELECT `{$this->Structure['0']}`, `{$this->Structure['1']}`, `{$this->Structure['2']}` FROM `{$this->Table}` WHERE `{$this->Structure['0']}` = '{$Username}';");

			

			if($Row = $MySQL->Fetch_Array()){

				if((sha1($Password . $Row[$this->Structure['2']])) == $Row[$this->Structure['1']]){

					return true;

				}

			}

			

			return false;

		}

	}

?>



Password stored in database must be hashed with SHA-1.

It is flexible so it uses any table and any field names.