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    ▪php用静态类实现的页面跳转      php用静态类实现的页面跳转，有需要的朋友，可以参考学习下。 1、页面跳转   代码如下: <?php /**  * Miscellaneous utility methods.  */ final class Utils {     private function __construct() {      .........

    ▪php根据session与cookie写的用户登录状态操作类      1、用户登录状态操作类UserLogin   代码如下: <?php final class UserLogin {     public function __construct() {     }     public static function getUserInfo() {         if (isset()($_COOKIE["user_id"])&&$_C.........

    ▪一个php的mysql操作类      一个php的mysql操作类，简单实用，供大家参考。   代码如下: <?php //数据库操作类 class db {     //SQL执行后的数据保存变量;     var $db;     //读取或设置当前数据的位置     var $pos.........

代码如下:

<?php
/**
 * Miscellaneous utility methods.
 */
final class Utils {
    private function __construct() {   
    }
/**
     * Redirect to the given page.
     * @param type $page target page
     * @param array $params page parameters
     */
    public static function redirect($page, $sub_page = null, array $params = array()) {
        header('Location: ' . self::createLink($page, $sub_page, $params));
        die();
    }

/**
     * Generate link.
     * @param string $page target page
     * @param array $params page parameters
     */
    public static function createLink($page, $sub_page = null, array $params = array()) {
        if ($sub_page) {
            $params = array_merge(array('sub_page' => $sub_page), $params);
        }
        if (!$page) {
            return "#";
        }
        $param_str = http_build_query($params);
        if (trim($param_str) == "") {
            return $page . '.php';
        } else {
            return $page . '.php?' . $param_str;
        }
    }
}
?>

代码如下:

<?php
if (UserLogin::isLogin() && $_COOKIE["user_id"]==1) {
    UserLogin::delUserInfo();
}
else if (UserLogin::isLogin()){
    Utils::redirect('welcome');
}
?>

代码如下:

<?php
final class UserLogin {
    public function __construct() {
    }

    public static function getUserInfo() {
        if (isset()($_COOKIE["user_id"])&&$_COOKIE["user_id"]&&(trim($_COOKIE["user_id"])!="")) {
            if (isset($_SESSION["USER_INFO"]))
                return $_SESSION["USER_INFO"];
            $dao = new UserDao();
            $user = $dao->find($_COOKIE["user_id"]);
            if ($user) {
                $_SESSION["USER_INFO"] = $user;
                setcookie("docloud_sid", session_id(), time() + 36000);
                setcookie("user_id", $_COOKIE["user_id"], time() + 36000);
               
                if (array_key_exists("selected_prj_id", $_COOKIE))
                    setcookie("selected_prj_id", $_COOKIE["selected_prj_id"], time() + 36000);
               
                if (array_key_exists("selected_class_id", $_COOKIE))
                    setcookie("selected_class_id", $_COOKIE["selected_class_id"], time() + 36000);
               
                if (array_key_exists("selected_image_id", $_COOKIE))
                    setcookie("selected_image_id", $_COOKIE["selected_image_id"], time() + 36000);
               
                if (array_key_exists("test_image_ids", $_COOKIE))
                    setcookie("test_image_ids", $_COOKIE["test_image_ids"], time() + 36000);
               
                if (array_key_exists("upload_image_ids", $_COOKIE))
                    setcookie("upload_image_ids", $_COOKIE["upload_image_ids"], time() + 36000);
                return $user;
            }
        }
        self::clearCookie();
        return null;
    }

    public static function setUserInfo($userInfo) {
        $_SESSION["USER_INFO"] = $userInfo;
        setcookie("docloud_sid", session_id(), time() + 36000);
        setcookie("user_id", $userInfo->getId(), time() + 36000);
    }

    public static function isLogin() {
        if (self::getUserInfo()) {
            return true;
        }
        return false;
    }

    public static function delUserInfo() {
        self::clearCookie();
        session_destroy();
    }
   
    private static function clearCookie() {
        setcookie("docloud_sid", "", time() - 36000);
        setcookie("user_id", "", time() - 36000);
        setcookie("selected_prj_id", "", time() - 36000);
        setcookie("selected_class_id", "", time() - 36000);
        setcookie("selected_image_id", "", time() - 36000);
        setcookie("test_image_ids", "", time() - 36000);
        setcookie("upload_image_ids", "", time() - 36000);
    }
}
?>

代码如下:

<?php
require_once 'Init.php';

// if logged in, logout
if (UserLogin::isLogin() && $_COOKIE["user_id"]==1) {
    UserLogin::delUserInfo();
}
else if (UserLogin::isLogin()){
    Utils::redirect('welcome');
}

$username = null;
$password = null;

$msg = "";

if (isset($_POST['username']) && isset($_POST['password'])) {
    $username = addslashes(trim(stripslashes()($_POST ['username'])));
    $password = addslashes()(trim(stripslashes($_POST ['password'])));
    // validate
    $errors = LoginValidator::validate($username, $password);
   
    if (empty($errors)) {
        // save
        $dao = new UserDao();
        $user = $dao->findByName($username);
        $last_login_ip = Utils::getIpAddress();
        $user->setLastLoginIp($last_login_ip);
        $now = new DateTime();
        $user->setLastLoginTime($now);
        $dao->save($user);
        UserLogin::setUserInfo($user);
        Flash::addFlash('登录成功！');
        Utils::redirect('welcome');
    }
   
    foreach ($errors as $e) {
        $msg .= $e->getMessage()."<br>";
    }
}
?>

代码如下:

<?php
//数据库操作类
class db
{
    //SQL执行后的数据保存变量;
    var $db;
    //读取或设置当前数据的位置
    var $position=0;
    //执行SQL语句并把结果保存为db变量中;

    function sub_sql($str)
    {
        global $prefix;//全局函数，表前缀
        return str_replace()("#@__",$prefix,$str);
    }
    function Sql($str)
    {
        $str=$this->sub_sql($str);
        $result = mysql_query()($str);
        $i=0;
        while($row = mysql_fetch_array($result))
        {
            $str_array[$i]=$row;
            $i++;
        }
        if(empty($str_array))
        {
            $str_array=array();
        }
        $this->db=$str_array;
    }
    //读取一条数据并把数据往后移一位，如果数据为空则返回为null;
    function Get_One()
    {
        $re=empty($this->db[$this->position])?null:$this->db[$this->position];
        $this->position=$re?$this->position+1:$this->position;
        return $re;
    }
    //判断是否数据读取到结尾了
    function Judge()
    {
        $re=empty($this->db[$this->position])?true:false;
        return $re;
    }
    //取得db里面的个数
    function Get_Num()
    {
        return count($this->db);
    }
    //更新数据库里面的数据，$t为表名,$v格式为数组格式，上标为字段名，下标为数据;$w为条件上标为字段名下标为数据，$p为条件0为等号，1为大于，-1为小于;
    function Set_Updata($t,$v,$w,$p=0)
    {
        $this->Sql($t);
        $v_str="";
        $w_str="";
        $f="";
        foreach($v as $key=>$vaule)
        {
            if(!is_numeric($key))
            {
                if(empty($v_str))
                {
                    $v_str=htmlspecialchars()($key)."='".htmlspecialchars($vaule)."'";
                }else
                {
                    $v_str=$v_str.",".htmlspecialchars($key)."='".htmlspecialchars($vaule)."'";
                }
            }
        }
        switch($p)
        {
            case 0:
                $f="=";
                break;
            case 1:
                $f=">";
                break;
            case -1:
                $f="<";
                break;
        }
        if(!empty($f))
        {
            foreach($w as $key=>$vaule)
            {
                if(!is_numeric($key))
                {
                    if(empty($v_str))
                    {
                        $w_str=htmlspecialchars($key).$f.htmlspecialchars($vaule)."'";
                    }else
                    {
                        $w_str=$w_str.",".htmlspecialchars($key).$f.htmlspecialchars($vaule)."'";
                    }
                }
            }
        }
        $sql="UPDATE ".$t." SET ".$v_str." where ".$w_str;
        return $result = mysql_query($sql);
    }
    //删除一数据$w为条件上标为字段名下标为数据，$p为条件0为等号，1为大于，-1为小于;
    function Set_Del($t,$w,$p=0)
    {
        $this->sub_sql($t);
        $w_str="";
        $f="";
        switch($p)
        {
            case 0:
                $f="=";
                break;
            case 1:
                $f=">";
                break;
            case -1:
                $f="<";
                break;
        }
        if(!empty($f))
        {
            foreach($w as $key=>$vaule)
            {
                if(!is_numeric($key))
                {
                    if(empty($v_str))
                    {
                        $w_str=htmlspecialchars($key).$f.htmlspecialchars($vaule)."'";
                    }else
                    {
                        $w_str=$w_str.",".htmlspecialchars($key).$f.htmlspecialchars($vaule)."'";
                    }
                }
            }
        }
        $str="DELETE FROM ".$t." WHERE ".$w_str;
        return $result = mysql_query($str);
    }
    function Add($t,$v)
    {
        $this->sub_sql($t);
        $k_str="";
        $v_str="";
        foreach($v as $key=>$vaule)
        {
            if(!is_numeric($key)){
                if(empty($k_str))
                {
                    $k_str=htmlspecialchars($key);
                    $v_str="'".htmlspecialchars($vaule)."'";
                }else
                {
                    $k_str=$k_str.",".htmlspecialchars($key);
                    $v_str=$v_str.","."'".htmlspecialchars($vaule)."'";
                }
            }
        }
        $str="INSERT INTO ".$t."(".$k_str.")"."value(".$v_str.")";
        return $result = mysql_query($str);
    }
}
?>