PHP单例模式实例浅析

header("Content-type:text/html;charset=utf-8");
//单例测试类
class Test {
    private $unique;
    static private $instance;//静态属性保存该类实例
     
    private function __construct(){//构造方法私有(防止外界调用)
        $this->unique=rand(0,20000);
    }
    static public function getInstance(){//静态方法提供对外接口(获取实例)
        if(!self::$instance instanceof self){
            self::$instance=new self();
        }
        return self::$instance;
    }
    private function __clone(){}//私有克隆方法,防止外界直接克隆该实例
    
}
$test=Test::getInstance();
$test2=Test::getInstance();
    
print_r($test);
print_r($test2);
    
if($test===$test2){
    echo '相等!';
}else{
    echo '不相等!';
}

<?php
//数据库类、单例模式
class db{
public $conn;
private  static $sql;
private static $instact = null;

private function __construct(){
require_once('db.config.php');
$this->conn = mysql_connect($db['host'],$db['user'],$db['psd']);
if(!mysql_select_db($db['databases'],$this->conn)){
echo "数据库连接错误";
}
mysql_query('set names utf8',$this->conn);
}

public static function getInstance(){
if(is_null(self::$instact)){
self::$instact = new  db;
}
return self::$instact;
}
/**
*数据查询
*/
public function select($table,$condition=array(),$field=array()){
$where ="";
if(!empty($condition)){
foreach($condition as $k=>$v){
$where.= $k."='".$v."' and ";
}
$where = "where ".$where." 1=1";
}
if(!empty($field)){
foreach($field as $k=>$v){
$fieldstr.= $v.",";
}
$fieldstr = rtrim($fieldstr);
}else{
$fieldstr = "*";
}
self::$sql = "select {$fieldstr} from {$table} {$where}";
$result =  mysql_query(self::$sql);
$i = 0;
while($row = mysql_fetch_assoc($result)){
foreach($row as $k=>$v){
$resultrow[$i][$k] = $v;
}
$i++;
}
var_dump($resultrow);
}

/**
*数据添加
*/
public function insert($table,$data){
$values = "";
$datas = "";
foreach ($data as $k=>$v){
$values.=$k.",";
$datas.="'$v'".",";
}
$values = rtrim($values,',');
$datas = rtrim($datas,',');
self::$sql = "insert into {$table}({$values}) values ({$datas})";
if(mysql_query(self::$sql)){
return mysql_insert_id();
}else{
return false;
};
}

/**
*数据更新
*/
public function update($table,$data,$condition=array()){
$where = "";
if(!empty($condition)){
foreach ($condition as $k=>$v){
$where.= $k."=".$v." and ";
}
$where="where ".$where."1=1";
}
$updatastr = "";
if(!empty($data)){
foreach($data as $k=>$v){
$updatastr.= $k."='".$v."',";
}
$updatastr= "set ".rtrim($updatastr,",");
}
self::$sql = "update {$table} {$updatastr} {$where}";
return mysql_query(self::$sql);
}
/**
*数据 删除
*/
public function delete($table,$condition){
$where = "";
if(!empty($condition)){
foreach( $condition as $k=>$v){
$where.=$k."='".$v."' and ";
}
$where = "where ".$where.'1=1';
}
self::$sql = "delete from {$table}  {$where}";
return mysql_query(self::$sql);
}
//打印sql
public function getlastsql(){
echo self::$sql;
}
}
$ne = db::getInstance();
//$ne->update('message',array('user'=>'wanghao','title'=>'sd'),array('id'=>'5'));
//echo $db->insert('message',array('user'=>'张三','title'=>'demo'));
$ne->select('message',array('user'=>'songlin'));
$ne->getlastsql();
?>

数据库的配置文件

db.config.php

<?php
$host = "localhost";  //主机地址
$user = "root";         //用户名
$psd= "";                 //密码
$databases = "ceshi";

$db = array( "host" =>$host,
"user" =>$user,
"psd" =>$psd,
"databases"=>$databases
);
?>

<?php

$str='a:2:{s:5:"title";s:13:"php教程分享网";s:3:"url";s:20:"http://www.111cn.net";}';
$regex = '/s＼:(＼d+)＼:＼"([^＼"]+)＼"/isx';

$str = preg_replace_callback(

$regex ,

"fixser",

$str);

function fixser($matches)

{

 return 's:'.strlen($matches[2]).':'.'"'.$matches[2].'"';

}

?>

<?php
$str='a:2:{s:5:"title";s:13:"php教程分享网";s:3:"url";s:20:"http://www.111cn.net";}';
$regex = '/s＼:(＼d+)＼:＼"([^＼"]+)＼"/isx';

$str = preg_replace_callback(
$regex ,
function ($matches)
{
 return 's:'.strlen($matches[2]).':'.'"'.$matches[2].'"';
},
$str);

?>

#############a域名ApiController.php #################
 /*
  * 根据当前域（a域名）的cookie信息设置bstv域下的cookie及session
  * 如果为空，则清空处理
  * */
 function setckAction() {
  $clr = $this->_request->getParam("clr");
  $bts_user = ($clr) ? '' : urlencode($_COOKIE['bts_LOGGED_USER']);
  $this->view->assign("bts_user",$bts_user);
 }
 
 /*
  * 提供给bstv域下，获取当前域（a域名）的cookie及session
  * 以脚本变量返回给bstv浏览器端
  * */
 function getckAction() {
  header('P3P: CP="CURa ADMa DEVa PSAo PSDo OUR BUS UNI PUR INT DEM STA PRE COM NAV OTC NOI DSP COR"');
  echo 'var ck="'.$_COOKIE['bts_LOGGED_USER'].'";';
  echo 'var sess="'.$_SESSION['user']['uid'].'";';
  exit();
 }
#############a域名index.php #################
##### 默认指定index.php为登录返回的页面
<script src="http://www.B域名/api/setck?bts_user={$bts_user}"></script>
############# B域名 api.php #################
 
 /*
  * 显示a域名域下的cookie及SESSION
  * 赋值到js变量
  * js 通过ajax写入cookie和session：如果a域名已退出，则bstv做退出处理
  * */
 function getbtsck() {
  include $this->template->getfile('api/getbtsck');
 }
 
 /*
  * a域名域下设置bstv域下的cookie及session
  * 如果为空，则清空处理
  * */
 function setck() {
  header('P3P: CP="CURa ADMa DEVa PSAo PSDo OUR BUS UNI PUR INT DEM STA PRE COM NAV OTC NOI DSP COR"');
 
  $bts_user = trim($_GET['bts_user']);
  if(!empty($bts_user)) {
   setcookie("bts_LOGGED_USER", urldecode($bts_user), time()+3600*24*365, "/", ".B域名");
   $this->cookieLoginLocal(urldecode($bts_user));
  } else {
   setcookie("bts_LOGGED_USER", $bts_user, '-1', "/", ".B域名");
   unset($_SESSION['uid']);
  }
 }
 
 function setsession() {
  $bts_user = trim($_POST['bts_user']);
  if(!empty($bts_user) && empty($_SESSION['uid'])) {
   setcookie("bts_LOGGED_USER", urldecode($bts_user), time()+3600*24*365, "/", ".B域名");
   $this->cookieLoginLocal(urldecode($bts_user));
  } else {
   echo 'uuunset';
   setcookie("bts_LOGGED_USER", $bts_user, '-1', "/", ".B域名");
   //unset($_SESSION['uid']);
  }
 }
 
 function cookieLoginLocal($cookieId){
  $cookieId = explode( '.', base64_decode($cookieId) );
  if ($cookieId[0] !== 'baitianshi' || empty($cookieId[1])) {
   return false;
  } else {
   return $this->loginLocal($cookieId[1],false,1);
  }
 }
 
 function loginLocal($uid,$password=false,$isuid=0) {
  $_SESSION['uid'] = $uid;
  return 1;
 }

############# B域名 getbtsck.html #################
<!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" xml:lang="en">
<head>
 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 <title>同步登陆</title>
 <script src="/js/jquery-1.8.1.min.js" type="text/javascript"></script>
    <script src="/api/getck"></script>
 <script language="javascript">
 function setck(bts_user) {
  $.post("/api/setsession",{bts_user:bts_user},function(re){ });}
  setck(ck);
    </script>
</head>
<body>
</body>
</html>

<?php
$test='472347127,893372115,850965403';
$r=explode(",",$test);
for($i=0;$i<sizeof($r);$i++)
{ echo $i.".". $r[$i].""; }
?>

<?php
$a="893372115,472347127,850965403" ;
$b=explode(",",$a);
foreach($b as $bb)
{ echo $bb.""; //print_r($b); }
?>

<?php

$source = "hello1,hello2,hello3,hello4,hello5";//按逗号分离字符串
$hello = explode(',',$source);

for($index=0;$index<count($hello);$index++){
echo $hello[$index];echo "</br>";
}

?>

<?php

// 分隔符可以是斜线，点，或横线
$date = "04/30/1973";
list($month, $day, $year) = split ('[/.-]', $date);
echo "Month: $month; Day: $day; Year: $year<br />n";
?>

< ?php
//重定向浏览器
header("Location: http://www.111cn.net");
//确保重定向后，后续代码不会被执行
exit;
?> 

if($_COOKIE["u_type"]){ header('location:register.php'); } else{ setcookie('u_type','1','86400*360');//设置cookie长期有效 header('location:zc.html'); }

// URL重定向
function redirect($url, $time=0, $msg=”) {
//多行URL地址支持
$url = str_replace(array(“n”, “r”), ”, $url);
if ( empty($msg) )
$msg = “系统将在{$time}秒之后自动跳转到{$url}！”;
if (!headers_sent()) {
// redirect
if (0 === $time) {
header(‘Location: ‘ . $url);
} else {
header(“refresh:{$time};url={$url}”);
echo($msg);
}
exit();
} else {
$str = “<meta http-equiv=’Refresh’ content=’{$time};URL={$url}’>”;
if ($time != 0)
$str .= $msg;
exit($str);
}
}

function getref()
{
 $url = @$_SERVER['HTTP_REFERER'];
 if( !empty( $url ) )
 {
  if( !strstr($url ,'111cn.net' ) && !strstr($url,'111cn.net'))
  {
   @header("http/1.1 404 not found");
   @header("status: 404 not found");
   include("404.html");//跳转到某一个页面，推荐使用这种方法
   exit();
  }
 }
 else
 {
  @header("http/1.1 404 not found");
  @header("status: 404 not found");
  include("404.html");//跳转到某一个页面，推荐使用这种方法
  exit();
 }
}

<?php  
 $the_host = $_SERVER['HTTP_HOST'];
 $request_uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '';
 if($the_host !== 'www.111cn.net')
 {
     //echo $_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];
    header('HTTP/1.1 301 Moved Permanently');
    header('Location: http://www.111cn.net' . $_SERVER['PHP_SELF']  . $request_uri);
 }
?>