php中内存缓存memcached实例

<?php

$memcache = memcache_connect('localhost', 11211);

if ($memcache) {
$memcache->set("str_key", "string to store in memcached");
$memcache->set("num_key", 123);

$object = new stdclass;
$object->attribute = 'test';
$memcache->set("obj_key", $object);

$array = array('assoc'=>123, 345, 567);
$memcache->set("arr_key", $array);

var_dump($memcache->get('str_key'));
var_dump($memcache->get('num_key'));
var_dump($memcache->get('obj_key'));
}
else {
echo "connection to memcached failed";
}
?>

class data {
 public   $data_dir    = "class/"; //备份文件存放的路径
 public   $transfer     ="";   //临时存放sql[切勿不要对该属性赋值，否则会生成错误的sql语句]

/**
 *数据库连接
 *@param string $host 数据库主机名
 *@param string $user 用户名
 *@param string $pwd  密码
 *@param string $db   选择数据库名
 *@param string $charset 编码方式
 */
 function connect_db($host,$user,$pwd,$db,$charset='gbk'){
  if(!$conn = mysql_connect($host,$user,$pwd)){
   return false;
  }
  mysql_select_db($db);
  mysql_query("set names $charset");
  return true;
 }

/**
 * 生成sql语句
 * @param   $table     要备份的表
 * @return  $tabledump 生成的sql语句
 */
 public function set_sql($table,$subsection=0,&$tabledom=''){
  $tabledom .= "drop table if exists $table ";
  $createtable = mysql_query("show create table $table");
  $create = mysql_fetch_row($createtable);
  $create[1] = str_replace(" ","",$create[1]);
  $create[1] = str_replace(" ","",$create[1]);

  $tabledom  .= $create[1]."; ";

  $rows = mysql_query("select * from $table");
  $numfields = mysql_num_fields($rows);
  $numrows = mysql_num_rows($rows);
  $n = 1;
  $sqlarry = array();
  while ($row = mysql_fetch_row($rows)){
     $comma = "";
     $tabledom  .= "insert into $table values(";
     for($i = 0; $i < $numfields; $i++)
     {
    $tabledom  .= $comma."'".mysql_escape_string($row[$i])."'";
    $comma = ",";
     }
    $tabledom  .= ") ";
     if($subsection != 0 && strlen($this->transfer )>=$subsection*1000){
       $sqlarry[$n]= $tabledom;
       $tabledom = ''; $n++;
     }
  }
  return $sqlarry;
   }

/**
 *列表数据库中的表
 *@param  database $database 要操作的数据库名
 *@return array    $dbarray  所列表的数据库表
 */
 public function get_db_table($database){
  $result = mysql_list_tables($database);
  while($tmparry = mysql_fetch_row($result)){
   $dbarry[]  = $tmparry[0];
  }
  return $dbarry;
 }

/**
 *验证目录是否有效
 *@param diretory $dir
 *@return booln
 */
 function check_write_dir($dir){
  if(!is_dir($dir)) {@mkdir($dir, 0777);}
  if(is_dir($dir)){
   if($link = opendir($dir)){
    $filearry = scandir($dir);
    for($i=0;$i<count($filearry);$i++){
     if($filearry[$i]!='.' || $filearry != '..'){
      @unlink($dir.$filearry[$i]);
     }
    }
   }
  }
  return true;
 }
/**
 *将数据写入到文件中
 *@param file $filename 文件名
 *@param string $str   要写入的信息
 *@return booln 写入成功则返回true,否则false
 */
 private function write_sql($filename,$str){
  $re= true;
  if(!@$fp=fopen($filename,"w+")) {$re=false; echo "在打开文件时遇到错误，备份失败!";}
  if(!@fwrite($fp,$str)) {$re=false; echo "在写入信息时遇到错误，备份失败!";}
  if(!@fclose($fp)) {$re=false; echo "在关闭文件 时遇到错误，备份失败!";}
  return $re;
 }

/**
 *生成sql文件
 *@param string $sql sql    语句
 *@param number $subsection 分卷大小，以kb为单位，为0表示不分卷
 */
     public function export_sql($table,$subsection=0){
      if(!$this->check_write_dir($this->data_dir)){echo '您没有权限操作目录,备份失败';return false;}
      if($subsection == 0){
       if(!is_array($table)){
    $this->set_sql($table,0,$this->transfer);
   }else{
    for($i=0;$i<count($table);$i++){
     $this->set_sql($table[$i],0,$this->transfer);
    }
   }
       $filename = $this->data_dir.date("ymd",time()).'_all.sql';
       if(!$this->write_sql($filename,$this->transfer)){return false;}
      }else{
       if(!is_array($table)){
    $sqlarry = $this->set_sql($table,$subsection,$this->transfer);
    $sqlarry[] = $this->transfer;
   }else{
    $sqlarry = array();
    for($i=0;$i<count($table);$i++){
     $tmparry = $this->set_sql($table[$i],$subsection,$this->transfer);
     $sqlarry = array_merge($sqlarry,$tmparry);
    }
    $sqlarry[] = $this->transfer;
   }
       for($i=0;$i<count($sqlarry);$i++){
        $filename = $this->data_dir.date("ymd",time()).'_part'.$i.'.sql';
        if(!$this->write_sql($filename,$sqlarry[$i])){return false;}
       }
      }
      return true;
    }
/**
 *载入sql文件
 *@param diretory $dir
 *@return booln
 *注意:请不在目录下面存放其它文件，或者目录
 *以节省恢复时间
 */
    public function import_sql($dir){
  if($link = opendir($dir)){
   $filearry = scandir($dir);
    $pattern = "_part[0-9]+.sql$|_all.sql$";
   for($i=0;$i<count($filearry);$i++){
    if(eregi($pattern,$filearry[$i])){
     $sqls=file($dir.$filearry[$i]);
     foreach($sqls as $sql){
      str_replace(" ","",$sql);
      str_replace(" ","",$sql);
      if(!mysql_query(trim($sql))) return false;
     }
    }
   }
   return true;
  }
    }

}

//$d = new data();

//连接数据库
//if(!$d->connect_db('localhost','root','','guestbook','gbk')){
// echo '数据库连接失败';
//}

//查找数据库内所有数据表
//$tablearry = $d->get_db_table('guestbook');

//备份并生成sql文件
//if(!$d->export_sql($tablearry)){
// echo '备份失败';
//}else{
// echo '备份成功';
//}

//恢复导入sql文件夹
//if($d->import_sql($d->data_dir)){
// echo '恢复成功';
//}else{
// echo '恢复失败';
//}

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>php+ajax用户注册验证用户是否在存（php mysql完整实例）</title>
<style type="text/css教程">
body{
 font-size:12px;
 text-align:center;
}
.text{
 width:180px;
 height:12px;
}
p{
 width:600px;
 height:20px;
 line-height:20px;
 text-align:left;
}
p label{
 display:block;
 width:80px;
 height:20px;
 line-height:20px;
 float:left;
 text-align:right;
}
p span{
 margin-left:10px;
}
</style>
</head>
<body>
<script language="网页特效">
function createxmlhttprequest(){
 var xmlhttp;
 if(window.activexobject){
  xmlhttp = new activexobject("microsoft.xmlhttp");
 }else if(window.xmlhttprequest){
  xmlhttp = new xmlhttprequest();
 }
 return xmlhttp;
}

function checkname(){
 var name = document.getelementbyid('name'); //获取用户名文本框
 var span = document.getelementbyid('name_info'); //获取用于显示结果的span标记
 if(name.value.length <= 4){
  span.style.color = '#ff0000'; //设置span标记内的字体颜色为红色
  span.innerhtml = '用户名长度不能少于4个字符！'; //span标记内容
  return false;
 }
 var xmlhttp = createxmlhttprequest();//创建异步请求对象
 var time = new date().gettime();
 var url = 'reg.php?act=reg&name=' + name.value.tolowercase() + '&tmp=' + time;//构造出请求地址
 xmlhttp.open("get",url,true); //建立一个异步请求
 /*这里我们使用get方式请求
   post方式的请求基本差不多，朋友们自己试试如果不行，在下面给我留言*/
 xmlhttp.onreadystatechange = function(){ //监视请求状态
  span.style.color = '#ff9900';
  span.innerhtml = '查询中，请稍候！';
  if(xmlhttp.readystate == 4 && xmlhttp.status == 200){
   if(xmlhttp.responsetext.indexof('no') != -1){ //如果服务器返回的信息中有no
    span.style.color = '#cb2121'; //设置span标记颜色为红色
    span.innerhtml = '用户名[' + name.value + ']已经被别的用户使用！';
   }else{//如果返回信息中没有no
    span.style.color = '#00a800';//设置颜色为绿色
    span.innerhtml = '恭喜您，该用户名未被注册!';
   }
   return true;
   delete xmlhttp; //删除请求对象
  }
 }
 xmlhttp.send(null); //发送请求
}
</script>
<form method="post" action="reg.php">
<p><label>用户名：</label><input type="text" class="text" id="name" name="user_name"/><span id="name_info"></span></p>
<p><label></label><input type="button" value="检查用户名" onclick="checkname()"/></p>
<p><label>密码：</label><input type="password" class="text" /></p>
<p><label>&nbsp;</label><input type="submit" value="注册" /></p>
</form>
</body>
</html>

<?php

include("conn.php");
$name=$_get['name'];
$name=urldecode($name);

if(strlen($name)>0){
 $sql="select username from registration where username = '$name'";
 $result=mysql_query($sql);
 $row=mysql_fetch_array($result);
 
 if($_get['act'] == 'reg'){
  if(!empty($row['username'])){ //只要注册用户名为kaixin的时候，注册页面就会用红色字体提示次用户已被注册！
  echo 'no';
  }else{
  echo 'yes';
  }
 }
}
?>

create table `registration` (
  `id` tinyint(6) not null auto_increment,
  `username` varchar(14) not null comment '注册用户名',
  `userpwd` varchar(14) not null comment '注册密码',
  primary key  (`id`)
) engine=innodb  default charset=gb2312 auto_increment=6 ;

--

insert into `registration` (`id`, `username`, `userpwd`) values
(1, 'admin', 'admin888'),
(2, 'lyn', '111cn.net'),
(3, 'xiaot', 'xiaot'),
(4, 'xiaoe', 'xiaoe'),
(5, '我爱www.111cn.net', '5201314110');

class cls_mysql{
var $querynum = 0;
var $link;
var $histories;

var $dbhost;
var $dbuser;
var $dbpw;
var $dbcharset;
var $pconnect;
var $tablepre;
var $time;

var $goneaway = 5;

function connect($dbhost, $dbuser, $dbpw, $dbname = '', $dbcharset = '', $pconnect = 0, $tablepre='', $time = 0) {
$this->dbhost = $dbhost;
$this->dbuser = $dbuser;
$this->dbpw = $dbpw;
$this->dbname = $dbname;
$this->dbcharset = $dbcharset;
$this->pconnect = $pconnect;
$this->tablepre = $tablepre;
$this->time = $time;

if($pconnect) {
if(!$this->link = mysql_pconnect($dbhost, $dbuser, $dbpw)) {
$this->halt('can not connect to mysql server');
}
} else {
if(!$this->link = mysql_connect($dbhost, $dbuser, $dbpw)) {
$this->halt('can not connect to mysql server');
}
}

if($this->version() > '4.1') {
if($dbcharset) {
mysql_query("set character_set_connection=".$dbcharset.", character_set_results=".$dbcharset.", character_set_client=binary", $this->link);
}

if($this->version() > '5.0.1') {
mysql_query("set sql_mode=''", $this->link);
}
}

if($dbname) {
mysql_select_db($dbname, $this->link);
}

}

function fetch_array($query, $result_type = mysql_assoc) {
return mysql_fetch_array($query, $result_type);
}

function result_first($sql) {
$query = $this->query($sql);
return $this->result($query, 0);
}

function fetch_first($sql) {
$query = $this->query($sql);
return $this->fetch_array($query);
}

function fetch_all($sql, $id = '') {
$arr = array();
$query = $this->query($sql);
while($data = $this->fetch_array($query)) {
$id ? $arr[$data[$id]] = $data : $arr[] = $data;
}
return $arr;
}

function cache_gc() {
$this->query("delete from {$this->tablepre}sqlcaches where expiry<$this->time");
}

function query($sql, $type = '', $cachetime = false) {
$func = $type == 'unbuffered' && @function_exists('mysql_unbuffered_query') ? 'mysql_unbuffered_query' : 'mysql_query';
if(!($query = $func($sql, $this->link)) && $type != 'silent') {
$this->halt('mysql query error', $sql);
}
$this->querynum++;
$this->histories[] = $sql;
return $query;
}

function affected_rows() {
return mysql_affected_rows($this->link);
}

function error() {
return (($this->link) ? mysql_error($this->link) : mysql_error());
}

function errno() {
return intval(($this->link) ? mysql_errno($this->link) : mysql_errno());
}

function result($query, $row) {
$query = @mysql_result($query, $row);
return $query;
}

function num_rows($query) {
$query = mysql_num_rows($query);
return $query;
}

function num_fields($query) {
return mysql_num_fields($query);
}

function free_result($query) {
return mysql_free_result($query);
}

function insert_id() {
return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("select last_insert_id()"), 0);
}

function fetch_row($query) {
$query = mysql_fetch_row($query);
return $query;
}

function fetch_fields($query) {
return mysql_fetch_field($query);
}

function version() {
return mysql_get_server_info($this->link);
}

function close() {
return mysql_close($this->link);
}

function halt($message = '', $sql = '') {
$error = mysql_error();
$errorno = mysql_errno();
if($errorno == 2006 && $this->goneaway-- > 0) {
$this->connect($this->dbhost, $this->dbuser, $this->dbpw, $this->dbname, $this->dbcharset, $this->pconnect, $this->tablepre, $this->time);
$this->query($sql);
} else {
$s = '<b>error:</b>'.$error.'<br />';
$s .= '<b>errno:</b>'.$errorno.'<br />';
$s .= '<b>sql:</b>:'.$sql;
exit($s);
}
}
}