PHP学习笔记 用户注册模块用户类以及验证码类

所以，把第一章，可重用类的代码贴出来，便于以后查阅以及供给有需要的朋友。
：User类，包括读取和设置数据库，以及保存更改交互

<?php 
class User{ 
private $uid; 
private $fields; 
public function __construct(){ 
$this->uid=null; 
$this->fields=array('username'=>'','password'=>'','emailAddr'=>'','isActive'=>false); 
} 
public function __get($field){ 
if($field=='userId'){ 
return $this->uid; 
}else{ 
return $this->fields[$field]; 
} 
} 
public function __set($field,$value){ 
if(array_key_exists($field,$this->fields)){ 
$this->fields[$field]=$value; 
} 
} 
//return if username is valid format 
public static function validateUsername($username){ 
return preg_match('/^[A-Z0-9]{2,20}$/i',$username); 
} 
//return if email address is valid format 
public static function validateEmailAddr($email){ 
return filter_var($email,FILTER_VALIDATE_EMAIL); 
} 
//return an object populated based on the record‘s user id 
public static function getById($user_id){ 
$user=new User(); 
$query=sprintf('SELECT USERNAME,PASSWORD,EMAIL_ADDR,IS_ACTIVE '. 
'FROM %sUSER WHERE USER_ID=%d',DB_TBL_PREFIX,$user_id); 
$result=mysql_query($query,$GLOBALS['DB']); 
if(mysql_num_rows($result)){ 
$row=mysql_fetch_assoc($result); 
$user->username=$row['USERNAME']; 
$user->password=$row['PASSWORD']; 
$user->emailAddr=$row['EMAIL_ADDR']; 
$user->isActive=$row['IS_ACTIVE']; 
ChromePhp::log($user_id); 
$user->uid=$user_id; 
} 
mysql_free_result($result); 
return $user; 
} 
//return an object populated based on the record's username 
public static function getByUsername($username){ 
$user=new User(); 
$query=sprintf('SELECT USER_ID,PASSWORD,EMAIL_ADDR,IS_ACTIVE '. 
'FROM %sUSER WHERE USERNAME="%s"',DB_TBL_PREFIX,mysql_real_escape_string($username,$GLOBALS['DB'])); 
$result=mysql_query($query,$GLOBALS['DB']); 
if(mysql_num_rows($result)){ 
$row=mysql_fetch_assoc($result); 
$user->username=$username; 
$user->password=$row['PASSWORD']; 
$user->emailAddr=$row['EMAIL_ADDR']; 
$user->isActive=$row['IS_ACTIVE']; 
$user->uid=$row['USER_ID']; 
} 
mysql_free_result($result); 
return $user; 
} 
//save the record to the database 
public function save(){ 
//update existing user's information 
if($this->uid){ 
$query = sprintf('UPDATE %sUSER SET USERNAME = "%s", ' . 
'PASSWORD = "%s", EMAIL_ADDR = "%s", IS_ACTIVE = %d ' . 
'WHERE USER_ID = %d', 
DB_TBL_PREFIX, 
mysql_real_escape_string($this->username, $GLOBALS['DB']), 
mysql_real_escape_string($this->password, $GLOBALS['DB']), 
mysql_real_escape_string($this->emailAddr, $GLOBALS['DB']), 
$this->isActive, 
$this->userId); 
return mysql_query($query, $GLOBALS['DB']); 
}else{ 
//create a new user 
$query=sprintf('INSERT INTO %sUSER(USERNAME,PASSWORD,' . 
'EMAIL_ADDR,IS_ACTIVE) VALUES ("%s","%s","%s",%d)', 
DB_TBL_PREFIX, 
mysql_real_escape_string($this->username,$GLOBALS['DB']), 
mysql_real_escape_string($this->password,$GLOBALS['DB']), 
mysql_real_escape_string($this->emailAddr,$GLOBALS['DB']), 
$this->isActive); 
if(mysql_query($query,$GLOBALS['DB'])){ 
$this->uid=mysql_insert_id($GLOBALS['DB']); 
return true; 
}else{ 
return false; 
} 
} 
} 
//set the record as inactive and return an activation token 
public function setInactive(){ 
$this->isActive=false; 
$this->save(); 
$token=random_text(5); 
$query=sprintf('INSERT INTO %sPENDING (USER_ID,TOKEN)' . 
'VALUES (%d,"%s")',DB_TBL_PREFIX,$this->uid,$token); 
return (mysql_query($query,$GLOBALS['DB']))?$token:false; 
} 
//clear the user's pending status and set the record as active 
public function setActive($token){ 
$query=sprintf('SELECT TOKEN FROM %sPENDING WHERE USER_ID=%d ' . 
'AND TOKEN="%s"',DB_TBL_PREFIX,$this->uid,mysql_real_escape_string($token,$GLOBALS['DB'])); 
$result=mysql_query($query,$GLOBALS['DB']); 
if(!mysql_num_rows(($result))){ 
mysql_free_result($result); 
return false; 
}else{ 
mysql_free_result($result); 
$query=sprintf('DELETE FROM %sPENDING WHERE USER_ID=%d ' . 
'AND TOKEN="%s"',DB_TBL_PREFIX,$this->uid,mysql_real_escape_string($token,$GLOBALS['DB'])); 
if(!mysql_query($query,$GLOBALS['DB'])){ 
return false; 
}else{ 
$this->isActive=true; 
return $this->save(); 
} 
} 
} 
} 
?>

如何使用：

<?php 
//create user instance 
$u=new User(); 
$u->username='jack'; 
$u->password=sha1('gogo'); 
$u->emailAddr='[e-mail]'; 
$u->save();//save this user 
?>

<?php 
$u=User::getByUsername('jack');//update user('jack') 
$u->password=sha1('newgogo'); 
$u->save();//save new jack 
?>

:验证码类：这个比较简单，你可以自己加个图片==

<?php 
//must start or continue session and save CAPTCHA string in $_SESSION for 
//it to be available to other requests 
if(!isset($_SESSION)){ 
session_start(); 
header('Cache-control:private'); 
} 
//create a 65*20 pixel image 
$width=65; 
$height=20; 
$image=imagecreate(65,20); 
//fill the image background color 
$bg_color=imagecolorallocate($image,0x33,0x66,0xFF); 
imagefilledrectangle($image,0,0,$width,$height,$bg_color); 
//fetch random text 
$text=random_text(5); 
//determine x and y coordinates for centering text 
$font=5; 
$x=imagesx($image)/2-strlen($text)*imagefontwidth($font)/2; 
$y=imagesy($image)/2-imagefontheight($font)/2; 
//write text on image 
$fg_color=imagecolorallocate($image,0xFF,0xFF,0xFF); 
imagestring($image,$font,$x,$y,$text,$fg_color); 
//save the CAPTCHA string for later comparison 
$_SESSION['captcha']=$text; 
//output the image 
header('Content-type:image/png'); 
imagepng($image); 
imagedestroy($image); 
?>

另外，该类用到了random_text()函数，代码如下：

<?php 
function random_text($count,$rm_similar=false){ 
$chars=array_flip(array_merge(range(0,9),range('A','Z'))); 
if($rm_similar){ 
unset($chars[0],$chars[1],$chars[2],$chars[5],$chars[8],$chars['B'],$chars['I'],$chars['O'],$chars['Q'],$chars['S'],$chars['V'],$chars['Z']); 
} 
for($i=0,$text='';$i<$count;$i++){ 
$text.=array_rand($chars); 
} 
return $text; 
} 
?>

连接数据库类：

<?php 
// database connection and schema constants 
define('DB_HOST', 'localhost'); 
define('DB_USER', 'username'); 
define('DB_PASSWORD', 'yourpassword'); 
define('DB_SCHEMA', 'WROX_DATABASE'); 
define('DB_TBL_PREFIX', 'WROX_'); 
// establish a connection to the database server 
if (!$GLOBALS['DB'] = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD)) 
{ 
die('Error: Unable to connect to database server.'); 
} 
if (!mysql_select_db(DB_SCHEMA, $GLOBALS['DB'])) 
{ 
mysql_close($GLOBALS['DB']); 
die('Error: Unable to select database schema.'); 
} 
?>

sql语句：

DROP TABLE IF EXISTS WROX_PENDING; 
DROP TABLE IF EXISTS WROX_USER; 
CREATE TABLE WROX_USER ( 
USER_ID INTEGER UNSIGNED NOT NULL AUTO_INCREMENT, 
USERNAME VARCHAR(20) NOT NULL, 
PASSWORD CHAR(40) NOT NULL, 
EMAIL_ADDR VARCHAR(100) NOT NULL, 
IS_ACTIVE TINYINT(1) DEFAULT 0, 
PRIMARY KEY (USER_ID) 
) 
ENGINE=MyISAM DEFAULT CHARACTER SET gb2312 
COLLATE gb2312_chinese_ci AUTO_INCREMENT=0; 
CREATE TABLE WROX_PENDING ( 
USER_ID INTEGER UNSIGNED PRIMARY KEY NOT NULL, 
TOKEN CHAR(10) NOT NULL, 
CREATED_DATE TIMESTAMP DEFAULT CURRENT_TIMESTAMP, 
FOREIGN KEY (USER_ID) 
REFERENCES WROX_USER(USER_ID) 
) 
ENGINE=MyISAM DEFAULT CHARACTER SET gb2312 
COLLATE gb2312_chinese_ci;