PHP用户验证和标签推荐的简单使用

本文给大家讲解一些最简单的验证知识。大家可以先看下效果图，如果大家感觉还不错，请参考实现代码。

效果图

bookmark_fns.php

<?phprequire_once('output_fns.php');require_once('db_fns.php');require_once('data_valid_fns.php');require_once('url_fns.php');require_once('user_auth_fns.php');?>

data_valid_fns.php

<?php// Test that each variable has a valuefunction filled_out($form_vars) {foreach ($form_vars as $key => $value) {if ((!isset($key)) || ($value == '')) {return false;} } return true;}// Valid emailfunction valid_email($address) {if (ereg('^[a-zA-Z0-9_/./-]+@[a-zA-Z0-9/-]+/.[a-zA-Z0-9/-/.]+$', $address)) {return true;}else {return false;}}?>

db_fns.php

<?php//Conncet to db function db_connect() {$db = new mysqli('127.0.0.1', 'bm_user', 'password', 'bookmarks');if (!$db) {throw new Exception("Could not connect to database server", 1);}else {return $db;}}?>

user_auth_fns.php

<?phprequire_once('db_fns.php');// register function register($username, $email, $password) {$conn = db_connect();$results = $conn -> query("select * from user where username = '".$username."'");if (!$results) {throw new Exception("Could not execute query", 1);}if ($results -> num_rows > 0) {throw new Exception("That username is taken - go back and choose another one.", 1);} $results = $conn -> query("insert into user values ('".$username."', sha1('".$email."'), '".$password."')");if (!$results) {throw new Exception('Could not register you in database - please try again later.');}return true;}// Log in function login($username, $password) {$conn = db_connect();$results = $conn -> query("select * from user where username = '".$username."' and passwd = sha1('".$password."')");if (!$results) {throw new Exception('Could not log you in.');}if ($results -> num_rows > 0) {return true;}else {throw new Exception('Could not log you in.');}}// Check valid user function check_valid_user() {if (isset($_SESSION['valid_user'])) {echo "Logged in as ".$_SESSION['valid_user'].".<br />";}else {do_html_header('Problem:');echo "You are not logged in.<br />";do_html_url('login.php', 'Login');do_html_foot();exit;}}// change password function change_password($username, $old_password, $new_password) {login($username, $old_password);$conn = db_connect();$result = $conn -> query("update user set passwd = sha1('".$new_password."') where username = '".$username."'");if (!$result) {throw new Exception('Password could not be changed.');} else {return true; // changed successfully}}function get_random_word($min_length, $max_length) {// grab a random word from dictionary between the two lengths// and return it// generate a random word$word = '';// remember to change this path to suit your system$dictionary = '/usr/dict/words'; // the ispell dictionary$fp = @fopen($dictionary, 'r');if(!$fp) {return false;}$size = filesize($dictionary);// go to a random location in dictionary$rand_location = rand(0, $size);fseek($fp, $rand_location);// get the next whole word of the right length in the filewhile ((strlen($word) < $min_length) || (strlen($word)>$max_length) || (strstr($word, "'"))) {if (feof($fp)) {fseek($fp, 0); // if at end, go to start}$word = fgets($fp, 80); // skip first word as it could be partial$word = fgets($fp, 80); // the potential password}$word = trim($word); // trim the trailing /n from fgetsreturn $word;}function reset_password($username) {// set password for username to a random value// return the new password or false on failure// get a random dictionary word b/w 6 and 13 chars in length$new_password = get_random_word(6, 13);if($new_password == false) {throw new Exception('Could not generate new password.');}// add a number between 0 and 999 to it// to make it a slightly better password$rand_number = rand(0, 999);$new_password .= $rand_number;// set user's password to this in database or return false$conn = db_connect();$result = $conn->query("update userset passwd = sha1('".$new_password."')where username = '".$username."'");if (!$result) {throw new Exception('Could not change password.'); // not changed} else {return $new_password; // changed successfully}}function notify_password($username, $password) {// notify the user that their password has been changed$conn = db_connect();$result = $conn->query("select email from userwhere username='".$username."'");if (!$result) {throw new Exception('Could not find email address.');} else if ($result->num_rows == 0) {throw new Exception('Could not find email address.');// username not in db} else {$row = $result->fetch_object();$email = $row->email;$from = "From: support@phpbookmark /r/n";$mesg = "Your PHPBookmark password has been changed to ".$password."/r/n"."Please change it next time you log in./r/n";if (mail($email, 'PHPBookmark login information', $mesg, $from)) {return true;} else {throw new Exception('Could not send email.');}}}?>