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

    <?php
    require_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 value
    function filled_out($form_vars) {
    foreach ($form_vars as $key => $value) {
    if ((!isset($key)) || ($value == '')) {
    return false;
    } 
    } 
    return true;
    }
    // Valid email
    function valid_email($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

    <?php
    require_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, $rand_location);
    // get the next whole word of the right length in the file
    while ((strlen($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 fgets
    return $word;
    }
    function reset_password($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 = $conn->query("update user
    set passwd = sha1('".$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 = $conn->query("select email from user
    where username='".$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.');
    }
    }
    }
    ?>

url_fns.php

    <?php
    require_once('db_fns.php');
    // Get user urls
    function get_user_urls($username) {
    $conn = db_connect();
    $results = $conn -> query("select bm_URL 
    from bookmark 
    where username = '" . $username . "'");
    if (!$results) {
    return false;
    }
    $url_array = array();
    for ($i = 1;$row = $results -> fetch_row();++$i) {
    $url_array[$i] = $row[0];
    }
    return $url_array;
    }
    // Add url to db
    function add_bm($new_url) {
    echo "Attempting to add ".htmlspecialchars($new_url)."<br />";
    $valid_user = $_SESSION['valid_user'];
    $conn = db_connect();
    $results = $conn -> query(" select * from bookmark 
    where username = '".$valid_user."' 
    and bm_URL = '".$new_url."'");
    if ($results && ($results -> num_rows > 0)) {
    throw new Exception("Bookmark already exists.", 1); 
    }
    $insert_result = $conn -> query("insert into bookmark values ('".$valid_user."', '".addslashes($new_url)."')");
    if (!$insert_result) {
    throw new Exception("Bookmark could not be inserted.", 1); 
    }
    return true;
    }
    // Delete url 
    function delete_bm($user, $url) {
    $conn = db_connect();
    $results = $conn -> query(" delete from bookmark 
    where username = '".$user."' 
    and bm_URL = '".$url."'");
    if (!$results) {
    throw new Exception("Bookmark could not be deleted.", 1); 
    }
    return true; 
    }
    function recommend_urls($valid_user, $popularity = 1) {
    $conn = db_connect();
    // $query = "select bm_URL
    // from bookmark
    // where username in
    // (select distinct(b2.username)
    // from bookmark b1, bookmark b2
    // where b1.username='".$valid_user."'
    // and b1.username != b2.username
    // and b1.bm_URL = b2.bm_URL)
    // and bm_URL not in
    // (select bm_URL
    // from bookmark
    // where username='".$valid_user."')
    // group by bm_url
    // having count(bm_url)>".$popularity;
    $query = "select bm_URL
    from bookmark
    where username in
    (select distinct(b2.username)
    from bookmark b1, bookmark b2
    where b1.username='".$valid_user."'
    and b1.username != b2.username
    and b1.bm_URL = b2.bm_URL)
    and bm_URL not in
    (select bm_URL
    from bookmark
    where username='".$valid_user."')
    group by bm_url
    having count(bm_url)>".$popularity;
    if (!($result = $conn->query($query))) {
    throw new Exception('Could not find any bookmarks to recommend.');
    }
    if ($result->num_rows==0) {
    throw new Exception('Could not find any bookmarks to recommend.');
    }
    $urls = array();
    // build an array of the relevant urls
    for ($count=0; $row = $result->fetch_object(); $count++) {
    $urls[$count] = $row->bm_URL;
    }
    return $urls;
    }
    ?>

output_fns.php

    <?php
    function do_html_header($title) {
    // print an HTML header
    ?>
    <html>
    <head>
    <title><?php echo $title;?></title>
    <style>
    body { font-family: Arial, Helvetica, sans-serif; font-size: 13px }
    li, td { font-family: Arial, Helvetica, sans-serif; font-size: 13px }
    hr { color: #3333cc; width=300; text-align=left}
    a { color: #000000 }
    </style>
    </head>
    <body>
    <img src="005.png" alt="PHPbookmark logo" border="0"
    align="left" valign="bottom" height="55" width="57" />
    <h1>PHPbookmark</h1>
    <hr />
    <?php
    if($title) {
    do_html_heading($title);
    }
    }
    function do_html_footer() {
    // print an HTML footer
    ?>
    </body>
    </html>
    <?php
    }
    function do_html_heading($heading) {
    // print heading
    ?>
    <h2><?php echo $heading;?></h2>
    <?php
    }
    function do_html_URL($url, $name) {
    // output URL as link and br
    ?>
    <br /><a href="<?php echo $url;?>"><?php echo $name;?></a><br />
    <?php
    }
    function display_site_info() {
    // display some marketing info
    ?>
    <ul>
    <li>Store your bookmarks online with us!</li>
    <li>See what other users use!</li>
    <li>Share your favorite links with others!</li>
    </ul>
    <?php
    }
    function display_login_form() {
    ?>
    <p><a href="register_form.php">Not a member?</a></p>
    <form method="post" action="member.php">
    <table bgcolor="#cccccc">
    <tr>
    <td colspan="2">Members log in here:</td>
    <tr>
    <td>Username:</td>
    <td><input type="text" name="username"/></td></tr>
    <tr>
    <td>Password:</td>
    <td><input type="password" name="passwd"/></td></tr>
    <tr>
    <td colspan="2" align="center">
    <input type="submit" value="Log in"/></td></tr>
    <tr>
    <td colspan="2"><a href="forgot_form.php">Forgot your password?</a></td>
    </tr>
    </table></form>
    <?php
    }
    function display_registration_form() {
    ?>
    <form method="post" action="register_new.php">
    <table bgcolor="#cccccc">
    <tr>
    <td>Email address:</td>
    <td><input type="text" name="email" size="30" maxlength="100"/></td></tr>
    <tr>
    <td>Preferred username <br />(max 16 chars):</td>
    <td valign="top"><input type="text" name="username"
    size="16" maxlength="16"/></td></tr>
    <tr>
    <td>Password <br />(between 6 and 16 chars):</td>
    <td valign="top"><input type="password" name="passwd"
    size="16" maxlength="16"/></td></tr>
    <tr>
    <td>Confirm password:</td>
    <td><input type="password" name="passwd2" size="16" maxlength="16"/></td></tr>
    <tr>
    <td colspan=2 align="center">
    <input type="submit" value="Register"></td></tr>
    </table></form>
    <?php
    }
    function display_user_urls($url_array) {
    // display the table of URLs
    // set global variable, so we can test later if this is on the page
    global $bm_table;
    $bm_table = true;
    ?>
    <br />
    <form name="bm_table" action="delete_bms.php" method="post">
    <table width="300" cellpadding="2" cellspacing="0">
    <?php
    $color = "#cccccc";
    echo "<tr bgcolor=\"".$color."\"><td><strong>Bookmark</strong></td>";
    echo "<td><strong>Delete?</strong></td></tr>";
    if ((is_array($url_array)) && (count($url_array) > 0)) {
    foreach ($url_array as $url) {
    if ($color == "#cccccc") {
    $color = "#ffffff";
    } else {
    $color = "#cccccc";
    }
    //remember to call htmlspecialchars() when we are displaying user data
    echo "<tr bgcolor=\"".$color."\"><td><a href=\"".$url."\">".htmlspecialchars($url)."</a></td>
    <td><input type=\"checkbox\" name=\"del_me[]\"
    value=\"".$url."\"/></td>
    </tr>";
    }
    } else {
    echo "<tr><td>No bookmarks on record</td></tr>";
    }
    ?>
    </table>
    </form>
    <?php
    }
    function display_user_menu() {
    // display the menu options on this page
    ?>
    <hr />
    <a href="member.php">Home</a>  | 
    <a href="add_bm_form.php">Add BM</a>  | 
    <?php
    // only offer the delete option if bookmark table is on this page
    global $bm_table;
    if ($bm_table == true) {
    echo "<a href=\"#\" onClick=\"bm_table.submit();\">Delete BM</a>  | ";
    } else {
    echo "<span style=\"color: #cccccc\">Delete BM</span>  | ";
    }
    ?>
    <a href="change_passwd_form.php">Change password</a>
    <br />
    <a href="recommend.php">Recommend URLs to me</a>  | 
    <a href="logout.php">Logout</a>
    <hr />
    <?php
    }
    function display_add_bm_form() {
    // display the form for people to ener a new bookmark in
    ?>
    <form name="bm_table" action="add_bms.php" method="post">
    <table width="250" cellpadding="2" cellspacing="0" bgcolor="#cccccc">
    <tr><td>New BM:</td>
    <td><input type="text" name="new_url" value="http://"
    size="30" maxlength="255"/></td></tr>
    <tr><td colspan="2" align="center">
    <input type="submit" value="Add bookmark"/></td></tr>
    </table>
    </form>
    <?php
    }
    function display_password_form() {
    // display html change password form
    ?>
    <br />
    <form action="change_passwd.php" method="post">
    <table width="250" cellpadding="2" cellspacing="0" bgcolor="#cccccc">
    <tr><td>Old password:</td>
    <td><input type="password" name="old_passwd"
    size="16" maxlength="16"/></td>
    </tr>
    <tr><td>New password:</td>
    <td><input type="password" name="new_passwd"
    size="16" maxlength="16"/></td>
    </tr>
    <tr><td>Repeat new password:</td>
    <td><input type="password" name="new_passwd2"
    size="16" maxlength="16"/></td>
    </tr>
    <tr><td colspan="2" align="center">
    <input type="submit" value="Change password"/>
    </td></tr>
    </table>
    <br />
    <?php
    }
    function display_forgot_form() {
    // display HTML form to reset and email password
    ?>
    <br />
    <form action="forgot_passwd.php" method="post">
    <table width="250" cellpadding="2" cellspacing="0" bgcolor="#cccccc">
    <tr><td>Enter your username</td>
    <td><input type="text" name="username" size="16" maxlength="16"/></td>
    </tr>
    <tr><td colspan=2 align="center">
    <input type="submit" value="Change password"/>
    </td></tr>
    </table>
    <br />
    <?php
    }
    function display_recommended_urls($url_array) {
    // similar output to display_user_urls
    // instead of displaying the users bookmarks, display recomendation
    ?>
    <br />
    <table width="300" cellpadding="2" cellspacing="0">
    <?php
    $color = "#cccccc";
    echo "<tr bgcolor=\"".$color."\">
    <td><strong>Recommendations</strong></td></tr>";
    if ((is_array($url_array)) && (count($url_array)>0)) {
    foreach ($url_array as $url) {
    if ($color == "#cccccc") {
    $color = "#ffffff";
    } else {
    $color = "#cccccc";
    }
    echo "<tr bgcolor=\"".$color."\">
    <td><a href=\"".$url."\">".htmlspecialchars($url)."</a></td></tr>";
    }
    } else {
    echo "<tr><td>No recommendations for you today.</td></tr>";
    }
    ?>
    </table>
    <?php
    }
    ?>
    login.php
    <?php
    require_once('bookmark_fns.php');
    do_html_header('');
    display_site_info();
    display_login_form();
    do_html_footer();
    ?>
    logout.php
    <?php

require_once('bookmark_fns.php');

    // start session
    session_start();
    $old_user = $_SESSION['valid_user'];
    unset($_SESSION['valid_user']);
    $result_dest = session_destroy();
    do_html_header('Logging out');
    if (!empty($old_user)) {
    if ($result_dest) {
    echo 'Logged out.<br />';
    do_html_url('login.php', 'Login');
    }else {
    echo 'Could not log you out.<br />';
    }
    }else {
    echo 'You are not logged in ,so have not been logged out.<br />';
    do_html_url('login.php', 'Login');
    }
    do_html_footer();
    ?>

register_form.php

    <?php
    require_once('bookmark_fns.php');
    do_html_header('User Registration');
    display_registration_form();
    do_html_footer();
    ?>
    register_new.php
    <?php
    require_once('bookmark_fns.php');
    // vars
    $email = $_POST['email'];
    $username = $_POST['username'];
    $passwd = $_POST['passwd'];
    $passwd2 = $_POST['passwd2'];
    // start session
    session_start();
    // valid data 
    try {
    if (!filled_out($_POST)) {
    throw new Exception("You have not filled the form out correctly - please go back and try again.", 1);
    }
    if (!valid_email($email)) { 
    throw new Exception("That is not a valid email address - please go back and try again.", 1);
    }
    if ($passwd != $passwd2) { 
    throw new Exception("The passwords you entered do not match - please go back and try again.", 1);
    }
    if ((strlen($passwd) < 6) || (strlen($passwd) > 16)) { 
    throw new Exception("Your password must be between 6 and 16 characters - please go back and try again.", 1);
    }
    register($username, $passwd, $email);
    $_SESSION['valid_user'] = $username;
    do_html_header('Rigistration successful');
    do_html_url('member.php', 'Go to members page');
    do_html_footer();
    } catch (Exception $e) {
    do_html_header('Problem: ');
    echo $e -> getMessage();
    do_html_footer();
    exit();
    }
    ?>

forgot_form.php

    <?php
    require_once('bookmark_fns.php');
    do_html_header('Reset password');
    display_forgot_form();
    do_html_footer();
    ?>
    forgot_passwd.php
    <?php
    require_once('bookmark_fns.php');
    do_html_header('Resetting password');
    $username = $_POST['username'];
    try {
    // get random password 
    $password = reset_password($username);
    notify_password($username, $password);
    echo "Your new password has been emailed to you.<br />";
    }catch(Exception $e){
    echo "Your password could not be reset - please try again later.";
    }
    do_html_url('login.php', 'Login');
    do_html_footer();
    ?>
    change_passwd_form.php
    <?php
    require_once('bookmark_fns.php');
    session_start();
    do_html_header('Change password');
    check_valid_user();
    display_password_form();
    display_user_menu(); 
    do_html_footer();
    ?>
    change_passed.php
    <?php
    require_once('bookmark_fns.php');
    session_start();
    do_html_header('Changing password');
    $old_passwd = $_POST['old_passwd'];
    $new_passwd = $_POST['new_passwd'];
    $new_passwd2 = $_POST['new_passwd2'];
    try {
    check_valid_user();
    if (!filled_out($_POST)) {
    throw new Exception("You have not filled the form out correctly - please go back and try again.", 1);
    }
    if ($new_passwd != $new_passwd2) { 
    throw new Exception("The passwords you entered do not match - please go back and try again.", 1);
    }
    if ((strlen($new_passwd) < 6) || (strlen($new_passwd) > 16)) { 
    throw new Exception("Your password must be between 6 and 16 characters - please go back and try again.", 1);
    }
    change_password($_SESSION['valid_user'], $old_passwd, $new_passwd2);
    echo 'Password changed.';
    }catch(Exception $e) {
    echo $e -> getMessage();
    }
    display_user_menu(); 
    do_html_footer();
    ?>
    add_bm_form.php
    <?php
    // include function files for this application
    require_once('bookmark_fns.php');
    session_start();
    // start output html
    do_html_header('Add Bookmarks');
    check_valid_user();
    display_add_bm_form();
    display_user_menu();
    do_html_footer();
    ?>

add_bms.php

    <?php
    require_once('bookmark_fns.php');
    session_start();
    $new_url = $_POST['new_url'];
    do_html_header('Adding bookmarks');
    try {
    check_valid_user();
    if (!filled_out($_POST)) {
    throw new Exception('Form not completely filled out.');
    } 
    if (strstr($new_url, 'http://') === false) {
    $new_url = 'http://'.$new_url;
    } 
    // check url is valid
    if (!@fopen($new_url, 'r')) {
    throw new Exception('Not a valid URL.');
    } 
    add_bm($new_url);
    echo "Bookmark added";
    if ($mks = get_user_urls($_SESSION['valid_user'])) {
    display_user_urls($mks);
    }
    }catch(Exception $e) {
    echo $e -> getMessage();
    }
    display_user_menu();
    do_html_footer();
    ?>

delete_bms.php

    <?php
    require_once('bookmark_fns.php');
    session_start();
    $del_me = $_POST['del_me'];
    $valid_user = $_SESSION['valid_user'];
    do_html_header('Deleting bookmarks');
    check_valid_user();
    if (!filled_out($_POST)) {
    echo "<p>You have not chosen any bookmarks to delete.<br />
    Please try again.</p>";
    display_user_menu();
    do_html_footer();
    exit;
    }else {
    if (count($del_me) > 0) {
    foreach ($del_me as $url) {
    if (delete_bm($valid_user, $url)) {
    echo "Deleted ".htmlspecialchars($url)."<br />";
    }else {
    echo "Could not deleted ".htmlspecialchars($url)."<br />";
    }
    }
    }else {
    echo "No bookmarks selected for deletion.";
    }
    }
    if ($mks = get_user_urls($_SESSION['valid_user'])) {
    display_user_urls($mks);
    }
    display_user_menu();
    do_html_footer();
    ?>

recommend.php

    <?php
    require_once('bookmark_fns.php');

    session_start();
    do_html_header('Recommending URLS');
    try {
    check_valid_user();
    $urls = recommend_urls($_SESSION['valid_user'], 1);
    display_recommended_urls($urls);
    }catch(Exception $e) {
    echo $e -> getMessage();
    }
    display_user_menu();
    do_html_footer();
    ?>

member.php

    <?php
    require_once('bookmark_fns.php');
    session_start();
    @$username = $_POST['username'];
    @$passwd = $_POST['passwd'];
    if ($username && $passwd) {
    try {
    // Log in 
    login($username, $passwd);
    $_SESSION['valid_user'] = $username;
    }catch(Exception $e) {
    do_html_header('Problem: ');
    echo "You could not be logged in. You must be logged in to view this page.";
    do_html_url('login.php', 'Login');
    do_html_footer();
    exit;
    }
    }
    do_html_header('Home');
    check_valid_user();
    if ($url_array = get_user_urls($_SESSION['valid_user'])) {
    display_user_urls($url_array);
    }
    display_user_menu();
    do_html_footer();
    ?>

以上所述是小编给大家介绍的PHP用户验证和标签推荐的简单使用，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！