A Backend OF Mail Subscription Page

index.html

<form action="mail.php" method="POST" id="subscribe">
<input type="text" id="subscribe-email" name="email" maxlength="50" placeholder="Enter your email address to subscribe for news" class="magnetic"><input type="submit" id="subscribe-submit" value="SUBSCRIBE" class="magnetic">
</form>

mail.php

<?php
/*
PDO类来自 http://www.oschina.net/code/snippet_854012_14676
*/
class pdomysql {
 public static $dbtype = 'mysql';
 public static $dbhost = '';
 public static $dbport = '';
 public static $dbname = '';
 public static $dbuser = '';
 public static $dbpass = '';
 public static $charset = '';
 public static $stmt = null;
 public static $DB = null;
 public static $connect = true; // 是否長连接
 public static $debug = false;
 private static $parms = array ();
  
 /**
  * 构造函数
  */
 public function __construct() {
  self::$dbtype = 'mysql';
  self::$dbhost = 'localhost';
  self::$dbport = '3306';
  self::$dbname = 'test';
  self::$dbuser = 'root';
  self::$dbpass = 'root';
  self::$connect = true;
  self::$charset = 'UTF8';
  self::connect ();
  self::$DB->setAttribute ( PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true );
  self::$DB->setAttribute ( PDO::ATTR_EMULATE_PREPARES, true );
  self::execute ( 'SET NAMES ' . self::$charset );
 }
 /**
  * 析构函数
  */
 public function __destruct() {
  self::close ();
 }
  
 /**
  * *******************基本方法开始********************
  */
 /**
  * 作用:连結数据库
  */
 public function connect() {
  try {
   self::$DB = new PDO ( self::$dbtype . ':host=' . self::$dbhost . ';port=' . self::$dbport . ';dbname=' . self::$dbname, self::$dbuser, self::$dbpass, array (
     PDO::ATTR_PERSISTENT => self::$connect
   ) );
  } catch ( PDOException $e ) {
   die ( "Connect Error Infomation:" . $e->getMessage () );
  }
 }
  
 /**
  * 关闭数据连接
  */
 public function close() {
  self::$DB = null;
 }
  
 /**
  * 對字串進行转義
  */
 public function quote($str) {
  return self::$DB->quote ( $str );
 }
  
 /**
  * 作用:获取数据表里的欄位
  * 返回:表字段结构
  * 类型:数组
  */
 public function getFields($table) {
  self::$stmt = self::$DB->query ( "DESCRIBE $table" );
  $result = self::$stmt->fetchAll ( PDO::FETCH_ASSOC );
  self::$stmt = null;
  return $result;
 }
  
 /**
  * 作用:获得最后INSERT的主鍵ID
  * 返回:最后INSERT的主鍵ID
  * 类型:数字
  */
 public function getLastId() {
  return self::$DB->lastInsertId ();
 }
  
 /**
  * 作用:執行INSERT\UPDATE\DELETE
  * 返回:执行語句影响行数
  * 类型:数字
  */
 public function execute($sql) {
  self::getPDOError ( $sql );
  return self::$DB->exec ( $sql );
 }
  
 /**
  * 获取要操作的数据
  * 返回:合併后的SQL語句
  * 类型:字串
  */
 private function getCode($table, $args) {
  $code = '';
  if (is_array ( $args )) {
   foreach ( $args as $k => $v ) {
    if ($v == '') {
     continue;
    }
    $code .= "`$k`='$v',";
   }
  }
  $code = substr ( $code, 0, - 1 );
  return $code;
 }
  
  
 public function optimizeTable($table) {
  $sql = "OPTIMIZE TABLE $table";
  self::execute ( $sql );
 }
  
  
 /**
  * 执行具体SQL操作
  * 返回:运行結果
  * 类型:数组
  */
 private function _fetch($sql, $type) {
  $result = array ();
  self::$stmt = self::$DB->query ( $sql );
  self::getPDOError ( $sql );
  self::$stmt->setFetchMode ( PDO::FETCH_ASSOC );
  switch ($type) {
   case '0' :
    $result = self::$stmt->fetch ();
    break;
   case '1' :
    $result = self::$stmt->fetchAll ();
    break;
   case '2' :
     
    $result = self::$stmt->rowCount ();
     
    break;
  }
  self::$stmt = null;
  return $result;
 }
  
 /**
  * *******************基本方法結束********************
  */
  
 /**
  * *******************Sql操作方法开始********************
  */
 /**
  * 作用:插入数据
  * 返回:表內記录
  * 类型:数组
  * 參数:$db->insert('$table',array('title'=>'Zxsv'))
  */
 public function add($table, $args) {
  $sql = "INSERT INTO `$table` SET ";
   
  $code = self::getCode ( $table, $args );
  $sql .= $code;
 
  return self::execute ( $sql );
 }
  
 /**
  * 修改数据
  * 返回:記录数
  * 类型:数字
  * 參数:$db->update($table,array('title'=>'Zxsv'),array('id'=>'1'),$where
  * ='id=3');
  */
 public function update($table, $args, $where) {
  $code = self::getCode ( $table, $args );
  $sql = "UPDATE `$table` SET ";
  $sql .= $code;
  $sql .= " Where $where";
   
  return self::execute ( $sql );
 }
  
 /**
  * 作用:刪除数据
  * 返回:表內記录
  * 类型:数组
  * 參数:$db->delete($table,$condition = null,$where ='id=3')
  */
 public function delete($table, $where) {
  $sql = "DELETE FROM `$table` Where $where";
  return self::execute ( $sql );
 }
  
 /**
  * 作用:获取單行数据
  * 返回:表內第一条記录
  * 类型:数组
  * 參数:$db->fetOne($table,$condition = null,$field = '*',$where ='')
  */
 public function fetOne($table, $field = '*', $where = false) {
  $sql = "SELECT {$field} FROM `{$table}`";
  $sql .= ($where) ? " WHERE $where" : '';
  return self::_fetch ( $sql, $type = '0' );
 }
 /**
  * 作用:获取所有数据
  * 返回:表內記录
  * 类型:二維数组
  * 參数:$db->fetAll('$table',$condition = '',$field = '*',$orderby = '',$limit
  * = '',$where='')
  */
 public function fetAll($table, $field = '*', $orderby = false, $where = false) {
  $sql = "SELECT {$field} FROM `{$table}`";
  $sql .= ($where) ? " WHERE $where" : '';
  $sql .= ($orderby) ? " ORDER BY $orderby" : '';
  return self::_fetch ( $sql, $type = '1' );
 }
 /**
  * 作用:获取單行数据
  * 返回:表內第一条記录
  * 类型:数组
  * 參数:select * from table where id='1'
  */
 public function getOne($sql) {
  return self::_fetch ( $sql, $type = '0' );
 }
 /**
  * 作用:获取所有数据
  * 返回:表內記录
  * 类型:二維数组
  * 參数:select * from table
  */
 public function getAll($sql) {
  return self::_fetch ( $sql, $type = '1' );
 }
 /**
  * 作用:获取首行首列数据
  * 返回:首行首列欄位值
  * 类型:值
  * 參数:select `a` from table where id='1'
  */
 public function scalar($sql, $fieldname) {
  $row = self::_fetch ( $sql, $type = '0' );
  return $row [$fieldname];
 }
 /**
  * 获取記录总数
  * 返回:記录数
  * 类型:数字
  * 參数:$db->fetRow('$table',$condition = '',$where ='');
  */
 public function fetRowCount($table, $field = '*', $where = false) {
   $sql = "SELECT COUNT({$field}) AS num FROM $table";
  $sql .= ($where) ? " WHERE $where" : '';
  return self::_fetch ( $sql, $type = '0' );
 }
  
 /**
  * 获取記录总数
  * 返回:記录数
  * 类型:数字
  * 參数:select count(*) from table
  */
 public function getRowCount($sql) {
  return self::_fetch ( $sql, $type = '2' );
 }
  
 /**
  * *******************Sql操作方法結束********************
  */
  
 /**
  * *******************错误处理开始********************
  */
  
 /**
  * 設置是否为调试模式
  */
 public function setDebugMode($mode = true) {
  return ($mode == true) ? self::$debug = true : self::$debug = false;
 }
  
 /**
  * 捕获PDO错误信息
  * 返回:出错信息
  * 类型:字串
  */
 private function getPDOError($sql) {
  self::$debug ? self::errorfile ( $sql ) : '';
  if (self::$DB->errorCode () != '00000') {
   $info = (self::$stmt) ? self::$stmt->errorInfo () : self::$DB->errorInfo ();
   echo (self::sqlError ( 'mySQL Query Error', $info [2], $sql ));
   exit ();
  }
 }
 private function getSTMTError($sql) {
  self::$debug ? self::errorfile ( $sql ) : '';
  if (self::$stmt->errorCode () != '00000') {
   $info = (self::$stmt) ? self::$stmt->errorInfo () : self::$DB->errorInfo ();
   echo (self::sqlError ( 'mySQL Query Error', $info [2], $sql ));
   exit ();
  }
 }
  
 /**
  * 寫入错误日志
  */
 private function errorfile($sql) {
  echo $sql . '<br />';
  $errorfile = _ROOT . './dberrorlog.php';
  $sql = str_replace ( array (
    "\n",
    "\r",
    "\t",
    "  ",
    "  ",
    "  "
  ), array (
    " ",
    " ",
    " ",
    " ",
    " ",
    " "
  ), $sql );
  if (! file_exists ( $errorfile )) {
   $fp = file_put_contents ( $errorfile, "<?PHP exit('Access Denied'); ?>\n" . $sql );
  } else {
   $fp = file_put_contents ( $errorfile, "\n" . $sql, FILE_APPEND );
  }
 }
  
 /**
  * 作用:运行错误信息
  * 返回:运行错误信息和SQL語句
  * 类型:字符
  */
 private function sqlError($message = '', $info = '', $sql = '') {
   
  $html = '';
  if ($message) {
   $html .=  $message;
  }
   
  if ($info) {
   $html .= 'SQLID: ' . $info ;
  }
  if ($sql) {
   $html .= 'ErrorSQL: ' . $sql;
  }
   
  throw new Exception($html);
 }
/**
 * *******************错误处理結束********************
 */
}
$config = array( 
	'dbhost'=>'localhost',
	'dbport'=>3306,
	'dbname'=>'rv_subscribe',
	'dbuser'=>'root',
	'dbpass'=>'root',
 );
$db = new pdomysql($config);
$mail=$_POST['email'];
#check alivable
$sql='select email from rv_subscribe  where email="'.$mail.'"';
$res=$db->getRowCount($sql);
if ($res!=0)
	{
		echo "您已经在邮件库内";
		return 0 ;
	}
	else
	{
		$res=$db->add('rv_subscribe',array('email'=>$mail));
		echo "添加成功";
		return 1;
	}

test.sql

# Host: localhost  (Version: 5.5.40)
# Date: 2015-12-06 21:21:12
# Generator: MySQL-Front 5.3  (Build 4.120)

/*!40101 SET NAMES utf8 */;

#
# Structure for table "rv_subscribe"
#

DROP TABLE IF EXISTS `rv_subscribe`;
CREATE TABLE `rv_subscribe` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `email` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`Id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4;

#
# Data for table "rv_subscribe"
#

/*!40000 ALTER TABLE `rv_subscribe` DISABLE KEYS */;
INSERT INTO `rv_subscribe` VALUES (1,'894849635@qq.com'),(2,'xiqingongzi');
/*!40000 ALTER TABLE `rv_subscribe` ENABLE KEYS */;

这个文件用于邮件订阅页面的后端 可以写入数据库，自动检查存在与否 建议使用Ajax 提交