PHP学习练手（十）
2024-05-26 13:04:37
模板
- header.html：
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title><?php echo $page_title; ?></title><link rel="stylesheet" href="../include/style.css" type="text/css" media = "screen">
</head>
<body><div id="header"><h1>Your Website</h1><h2>catchy slogan...</h2></div><div id="navigation"><ul><li><a href="index.php">Home Page</a></li><li><a href="register.php">Register</a></li><li><a href="view_users.php">View Users</a></li><li><a href="password.php">Change Password</a></li><li><a href="#">link five</a></li></ul></div><div id="content"><!-- Start of the page-specific content--><!-- Script 9.1 - header.html -->- footer.html：
<!-- Script 3.3 - footer.html--><!-- End of the page-specific content. --></div><div id="footer"><p>Coryright $copy; <a href="#">Plain and Simple</a> 2015 | Designed by <a href="http://www.edg3.co.uk"></a> | Sponsored by <a href="http://www.opendesigns.org/">OpenDesigns</a> | Valid <a href="http://jigsaw.w3.org/css-validator">CSS</a> & <a href="http://validator.w3.org">XHTML</a></p></div>
</body>
</html>- mysqli_connect.php：
<?php # Script 9.2 - mysqli_connect.phpDEFINE ('DB_USER', 'XXX'); //填写自己数据库的用户名
DEFINE ('DB_PASSWORD', 'XXX'); //填写自己数据库的密码
DEFINE ('DB_HOST', 'localhost');
DEFINE ('DB_NAME', 'sitename');//连接数据库
$mysqli = @mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME) OR die('Could not connect to MySQL:'.mysqli_connect_error());//设置数据库字符编码
mysqli_set_charset($mysqli, 'utf8');知识点：
mysqli_connect（）——连接到服务器
mysqli_connect_error（）——如果发生连接错误，它返回连接错误消息，不带参数
在函数调用之前放置一个错误控制运算符（@），可以防止在web浏览器中显示PHP错误。这是一种首选的做法，因为错误将由OR die()子句处理。
因为mysqli_connect.php包含敏感的MySQL访问信息，故将其存储在与htdocs同一级目录上，这样就不能从Web浏览器访问该文件。
register.php
<?php # Script 9.3 - register.php$page_title = 'Register';include ('../include/header.html');//检查提交状态if($_SERVER['REQUEST_METHOD'] == 'POST'){$errors = array(); //存储错误信息//检查first nameif(empty($_POST['first_name'])){$errors[] = 'You forgot to enter your first name';}else{$fn = trim($_POST['first_name']);}//检查last nameif (empty($_POST['last_name'])) {$errors[] = 'You forgot to enter your last name';}else{$ln = trim($_POST['last_name']);}//检查email Addressif (empty($_POST['email'])) {$errors[] = 'You forgot to enter your email';}else{$e = trim($_POST['email']);}//检查password 和 confirm passwordif (!empty($_POST['pass1'])) {if ($_POST['pass1'] != $_POST['pass2']) {$errors[] = 'Your password did not match the confirm password';}else{$p = trim($_POST['pass1']);} }else{$errors[] = 'You forgot to enter your password';}//检查是否存在错误if (empty($errors)) { //无误//连接数据库require ('../mysqli_connect.php');//执行insert操作$sql = "INSERT INTO users(first_name, last_name, email, pass, registration_date) VALUES ('$fn', '$ln', '$e', SHA1('$p'), NOW())";$res = @mysqli_query($mysqli, $sql);if($res) //插入成功{echo '<h1>Thank you!</h1><p>You are now registered. In Chapter 12 you will actually be able to login in!</p><p><br/></p>';}else{ //插入失败echo '<h1>System Error</h1><p class="error">You could not be registered due to a system error. We apologize for any inconvenience</p>';echo '<p>'.mysqli_error($mysqli).'<br /><br />'.$sql.'</p>';}mysqli_close($mysqli); //关闭数据库include ('../include/footer.html');exit();}else{ //有误echo '<h1>Error!</h1><p class="error">The following error(s) occured:<br/ >';foreach ($errors as $msg) {echo "- $msg<br/ >";}echo '</p><p>Please try again</p><p><br/ ></p>';}}?>
<h1>Register</h1>
<form action="register.php" method="post"><p>First Name: <input type="text" name="first_name" size="15" maxlength="20" value="<?php if(isset($_POST['first_name'])) echo $_POST['first_name']; ?>" /></p><p>Last Name: <input type="text" name="last_name" size="15" maxlength="40" value="<?php if(isset($_POST['last_name'])) echo $_POST['last_name']; ?>" /></p><p>Email Address: <input type="text" name="email" size="20" maxlength="60" value="<?php if(isset($_POST['email'])) echo $_POST['email']; ?>" /></p><p>Password: <input type="password" name="pass1" size="10" maxlength="20" value="<?php if(isset($_POST['pass1'])) echo $_POST['pass1']; ?>" /></p><p>Confirm Password: <input type="password" name="pass2" size="10" maxlength="20" value="<?php if(isset($_POST['pass2'])) echo $_POST['pass2']; ?>" /></p><p><input type="submit" name="submit" value="Register" /></p>
</form>
<?php include ('../include/footer.html')?>
在浏览器中输入register.php的url,结果如图
提交之后，如图
假设某一信息没填，如图
view_users.php
<?php #Script 9.4 -view_users.php$page_title = 'View the Current Users';include ('../include/header.html');echo '<h1>Registered Users</h1>';require ('../mysqli_connect.php');$sql = "SELECT CONCAT(last_name, ',', first_name) AS name, DATE_FORMAT(registration_date, '%M %d, %Y') AS dr FROM users ORDER BY registration_date ASC";$res = @mysqli_query ($mysqli, $sql);if($res){echo '<table align="center" cellspacing="3" width="75%"><tr><td align="left"><b>Name</b></td><td align="left"><b>Date Registered</b></td></tr>';while ($rows = mysqli_fetch_array($res, MYSQLI_ASSOC)) {echo '<tr><td align="left">'.$rows['name'].'</td><td align="left">'.$rows['dr'].'</td></tr>';}echo '</table>';mysqli_free_result($res); //释放掉资源}//if_$reselse{echo '<p class="error">The current users could not be retrieved. We apologize for any inconvenience.</p>';echo '<p>'.mysqli_error($mysqli).'<br/ ><br/ >Query: '.$sql.'</p>';}mysqli_close($mysqli);include ('../include/footer.html');?>- 运行之后
知识点：
mysqli_fetch_array([参数])：它带有一个查询结果变量，以数组个数返回一行数据，采用循环，可以返回多行数据。
mysqli_free_result ( res)：消除 res)：消除res占用的系统开销
mysqli_fetch_array()与 mysqli_fetch_array($res, MYSQLI_NUM)等价
mysqli_fetch_assoc()与mysqli_fetch_array($res,MYSQLI_ASSOC)等价
参数：
1、MYSQLI_ASSOC: 返回关联数组形式，如$rows['column']
2、MYSQLI_NUM: 返回索引数组形式，如$rows[0]，与参数不填作用相同。比MYSQLI_ASSOC要快一点，且占用内存少些。
3、MYSQLI_BOTH: 返回关联和索引2种形式- register2.php——register的安全版
<?php # Script 9.3 - register.php$page_title = 'Register';include ('../include/header.html');//检查提交状态if($_SERVER['REQUEST_METHOD'] == 'POST'){//连接数据库require ('../mysqli_connect.php');$errors = array(); //存储错误信息//检查first nameif(empty($_POST['first_name'])){$errors[] = 'You forgot to enter your first name';}else{$fn = mysqli_real_escape_string($mysqli, trim($_POST['first_name']));}//检查last nameif (empty($_POST['last_name'])) {$errors[] = 'You forgot to enter your last name';}else{$ln = mysqli_real_escape_string($mysqli, trim($_POST['last_name']));}//检查email Addressif (empty($_POST['email'])) {$errors[] = 'You forgot to enter your email';}else{$e = mysqli_real_escape_string($mysqli, trim($_POST['email']));}//检查password 和 confirm passwordif (!empty($_POST['pass1'])) {if ($_POST['pass1'] != $_POST['pass2']) {$errors[] = 'Your password did not match the confirm password';}else{$p = mysqli_real_escape_string($mysqli, trim($_POST['pass1']));} }else{$errors[] = 'You forgot to enter your password';}//检查是否存在错误if (empty($errors)) { //无误//执行insert操作$sql = "INSERT INTO users(first_name, last_name, email, pass, registration_date) VALUES ('$fn', '$ln', '$e', SHA1('$p'), NOW())";$res = @mysqli_query($mysqli, $sql);if($res) //插入成功{echo '<h1>Thank you!</h1><p>You are now registered. In Chapter 12 you will actually be able to login in!</p><p><br/></p>';}else{ //插入失败echo '<h1>System Error</h1><p class="error">You could not be registered due to a system error. We apologize for any inconvenience</p>';echo '<p>'.mysqli_error($mysqli).'<br /><br />'.$sql.'</p>';}mysqli_close($mysqli); //关闭数据库include ('../include/footer.html');exit();}else{ //有误echo '<h1>Error!</h1><p class="error">The following error(s) occured:<br/ >';foreach ($errors as $msg) {echo "- $msg<br/ >";}echo '</p><p>Please try again</p><p><br/ ></p>';}mysqli_close($mysqli); //关闭数据库}?>
<h1>Register</h1>
<form action="register2.php" method="post"><p>First Name: <input type="text" name="first_name" size="15" maxlength="20" value="<?php if(isset($_POST['first_name'])) echo $_POST['first_name']; ?>" /></p><p>Last Name: <input type="text" name="last_name" size="15" maxlength="40" value="<?php if(isset($_POST['last_name'])) echo $_POST['last_name']; ?>" /></p><p>Email Address: <input type="text" name="email" size="20" maxlength="60" value="<?php if(isset($_POST['email'])) echo $_POST['email']; ?>" /></p><p>Password: <input type="password" name="pass1" size="10" maxlength="20" value="<?php if(isset($_POST['pass1'])) echo $_POST['pass1']; ?>" /></p><p>Confirm Password: <input type="password" name="pass2" size="10" maxlength="20" value="<?php if(isset($_POST['pass2'])) echo $_POST['pass2']; ?>" /></p><p><input type="submit" name="submit" value="Register" /></p>
</form>
<?php include ('../include/footer.html')?>
注册新用户，如图
知识点：
mysqli_real_escape_string($mysqli, data)：转义那些可能有问题的字符来清理数据。
如果在服务器上启用Magic Quotes，那么在使用mysqli_real_escape_string()函数之前，需要删除Magic Quotes添加的任何斜杠，采用stripslashes()函数。
view_users2.php
<?php #Script 9.4 -view_users.php$page_title = 'View the Current Users';include ('../include/header.html');echo '<h1>Registered Users</h1>';require ('../mysqli_connect.php');$sql = "SELECT CONCAT(last_name, ',', first_name) AS name, DATE_FORMAT(registration_date, '%M %d, %Y') AS dr FROM users ORDER BY registration_date ASC";$res = @mysqli_query ($mysqli, $sql);$nums = mysqli_num_rows($res);if($nums > 0){echo "<p>There are currently $nums registered users</p>";echo '<table align="center" cellspacing="3" width="75%"><tr><td align="left"><b>Name</b></td><td align="left"><b>Date Registered</b></td></tr>';while ($rows = mysqli_fetch_array($res, MYSQLI_ASSOC)) {echo '<tr><td align="left">'.$rows['name'].'</td><td align="left">'.$rows['dr'].'</td></tr>';}echo '</table>';mysqli_free_result($res); //释放掉资源}//if_$numselse{echo '<p class="error">The current users could not be retrieved. We apologize for any inconvenience.</p>';echo '<p>'.mysqli_error($mysqli).'<br/ ><br/ >Query: '.$sql.'</p>';}mysqli_close($mysqli);include ('../include/footer.html');?>运行
知识点：
- mysqli_num_rows($res)：返回select查询检索的行数，并将查询结果变量作为一个参数返回，可以用在分页显示查询结果中
password.php
<?php$page_title = 'Change your Password';
include ('../include/header.html');if($_SERVER['REQUEST_METHOD'] == 'POST')
{require('../mysqli_connect.php');$errors = array(); //存储错误信息//检查emailif(empty($_POST['email'])){$errors = 'You forget to enter your email address';}else{$e = mysqli_real_escape_string($mysqli, trim($_POST['email']));}//检查current passwordif(empty($_POST['pass'])){$errors = 'You forget to enter your current password';}else{$p = mysqli_real_escape_string($mysqli, trim($_POST['pass']));}//检查new passwordif (!empty($_POST['pass1'])) {if ($_POST['pass1'] != $_POST['pass2']) {$errors[] = 'Your new password did not match the confirm password';}else{$np = mysqli_real_escape_string($mysqli, trim($_POST['pass1']));} }else{$errors[] = 'You forgot to enter your new password';}if(empty($errors)){$sql = "SELECT user_id FROM users WHERE (email='$e' AND pass=SHA1('$p'))";$res = @mysqli_query($mysqli, $sql);$nums = mysqli_num_rows($res);if($nums == 1){$row = mysqli_fetch_array($res, MYSQLI_NUM);$sql = "UPDATE users SET pass=SHA1('$np') WHERE user_id = $row[0]";$res = @mysqli_query($mysqli, $sql);if(mysqli_affected_rows($mysqli) == 1){echo '<h1>Thank you!</h1><p>Your password has been updated. In Chapter 12 you will actually be able to login in!</p><p><br/></p>';}else{echo '<h1>Thank you!</h1><p class="error">Your password could not be changed due to a system error, We apologize for any inconvenience.</p>';echo '<p>'.mysqli_error($mysqli).'<br /><br />'.$sql.'</p>';}mysqli_close($mysqli);include('../include/footer.html');exit();}//if_$numselse{echo '<h1>Error!</h1><p class="error">The email address and password do not match those on file.<br/ ></p>';}}//if_empty($errors)else{echo '<h1>Error!</h1><p class="error">The following error(s) occured:<br/ >';foreach ($errors as $msg) {echo "- $msg<br/ >";}echo '</p><p>Please try again</p><p><br/ ></p>';}mysqli_close($mysqli);
}?>
<h1>Change Your Password</h1>
<form action="password.php" method="post"><p>Email Address: <input type="text" name="email" size="20" maxlength="60" value="<?php if(isset($_POST['email'])) echo $_POST['email']; ?>" /></p><p>Current Password: <input type="password" name="pass" size="10" maxlength="20" value="<?php if(isset($_POST['pass'])) echo $_POST['pass1']; ?>" /></p><p>New Password: <input type="password" name="pass1" size="10" maxlength="20" value="<?php if(isset($_POST['pass1'])) echo $_POST['pass1']; ?>" /></p><p>Confirm Password: <input type="password" name="pass2" size="10" maxlength="20" value="<?php if(isset($_POST['pass2'])) echo $_POST['pass2']; ?>" /></p><p><input type="submit" name="submit" value="Register" /></p>
</form><?php include ('../include/footer.html'); ?>用于修改当前密码
知识点：
如果使用命令TRUNCATE tablename
从表中删除所有记录，则mysqli_affected_rows()会返回0，即使查询成功执行并删除了每一行
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