php常用工具类

/**   
* 常用工具类   
* @author wj   
* @date   2015-4-15
*/  
class Tool {  
    /**
     * js 弹窗并且跳转
     * @param string $_info
     * @param string $_url
     * @return js
     */  
    static public function alertLocation($_info, $_url) {  
        echo "";  
        exit();  
    }  
      
    /**
     * js 弹窗返回
     * @param string $_info
     * @return js
     */  
    static public function alertBack($_info) {  
        echo "";  
        exit();  
    }  
      
    /**
     * 页面跳转
     * @param string $url
     * @return js
     */  
    static public function headerUrl($url) {  
        echo "";  
        exit();  
    }  
      
    /**
     * 弹窗关闭
     * @param string $_info
     * @return js
     */  
    static public function alertClose($_info) {  
        echo "";  
        exit();  
    }  
      
    /**
     * 弹窗
     * @param string $_info
     * @return js
     */  
    static public function alert($_info) {  
        echo "";  
        exit();  
    }  
      
    /**
     * 系统基本参数上传图片专用
     * @param string $_path
     * @return null
     */  
    static public function sysUploadImg($_path) {  
        echo '';  
        echo '';  
        echo '';  
        echo '';  
    }  
      
    /**
     * html过滤
     * @param array|object $_date
     * @return string
     */  
    static public function htmlString($_date) {  
        if (is_array($_date)) {  
            foreach ($_date as $_key=>$_value) {  
                $_string[$_key] = Tool::htmlString($_value);  //递归  
            }  
        } elseif (is_object($_date)) {  
            foreach ($_date as $_key=>$_value) {  
                $_string->$_key = Tool::htmlString($_value);  //递归  
            }  
        } else {  
            $_string = htmlspecialchars($_date);  
        }  
        return $_string;  
    }  
      
    /**
     * 数据库输入过滤
     * @param string $_data
     * @return string
     */  
    static public function mysqlString($_data) {  
        $_data = trim($_data);  
        return !GPC ? addcslashes($_data) : $_data;  
    }  
      
    /**
     * 清理session
     */  
    static public function unSession() {  
        if (session_start()) {  
            session_destroy();  
        }  
    }  
      
    /**
     * 验证是否为空
     * @param string $str
     * @param string $name
     * @return bool (true or false)
     */  
    static function validateEmpty($str, $name) {  
        if (empty($str)) {  
            self::alertBack('警告：' .$name . '不能为空！');  
        }  
    }  
      
    /**
     * 验证是否相同
     * @param string $str1
     * @param string $str2
     * @param string $alert
     * @return JS  
     */  
    static function validateAll($str1, $str2, $alert) {  
        if ($str1 != $str2) self::alertBack('警告：' .$alert);  
    }  
      
    /**
     * 验证ID
     * @param Number $id
     * @return JS
     */  
    static function validateId($id) {  
        if (empty($id) || !is_numeric($id)) self::alertBack('警告：参数错误！');  
    }  
      
    /**
     * 格式化字符串
     * @param string $str
     * @return string
     */  
    static public function formatStr($str) {  
        $arr = array(' ', ' ', '&', '@', '#', '%',  '\'', '"', '\\', '/', '.', ',', '$', '^', '*', '(', ')', '[', ']', '{', '}', '|', '~', '`', '?', '!', ';', ':', '-', '_', '+', '=');  
        foreach ($arr as $v) {  
            $str = str_replace($v, '', $str);  
        }  
        return $str;  
    }  
      
    /**
     * 格式化时间
     * @param int $time 时间戳
     * @return string
     */  
    static public function formatDate($time='default') {  
        $date = $time == 'default' ? date('Y-m-d H:i:s', time()) : date('Y-m-d H:i:s', $time);  
        return $date;  
    }  
      
    /**   
    * 获得真实IP地址   
    * @return string   
    */  
    static public function realIp() {     
        static $realip = NULL;     
        if ($realip !== NULL) return $realip;    
        if (isset($_SERVER)) {    
            if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {     
                $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);    
                foreach ($arr AS $ip) {    
                    $ip = trim($ip);    
                    if ($ip != 'unknown') {     
                        $realip = $ip;     
                        break;     
                    }     
                }     
            } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {     
                $realip = $_SERVER['HTTP_CLIENT_IP'];    
            } else {     
                if (isset($_SERVER['REMOTE_ADDR'])) {     
                    $realip = $_SERVER['REMOTE_ADDR'];     
                } else {     
                    $realip = '0.0.0.0';     
                }    
            }    
        } else {    
            if (getenv('HTTP_X_FORWARDED_FOR')) {    
                $realip = getenv('HTTP_X_FORWARDED_FOR');    
            } elseif (getenv('HTTP_CLIENT_IP')) {    
                $realip = getenv('HTTP_CLIENT_IP');    
            } else {    
                $realip = getenv('REMOTE_ADDR');    
            }    
        }  
        preg_match('/[\d\.]{7,15}/', $realip, $onlineip);    
        $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';    
        return $realip;    
    }  
      
    /**
     * 加载 Smarty 模板
     * @param string $html
     * @return null;
     */  
    static public function display() {  
        global $tpl;$html = null;  
        $htmlArr = explode('/', $_SERVER[SCRIPT_NAME]);  
        $html = str_ireplace('.php', '.html', $htmlArr[count($htmlArr)-1]);  
        $dir = dirname($_SERVER[SCRIPT_NAME]);  
        $firstStr = substr($dir, 0, 1);  
        $endStr = substr($dir, strlen($dir)-1, 1);  
        if ($firstStr == '/' || $firstStr == '\\') $dir = substr($dir, 1);  
        if ($endStr != '/' || $endStr != '\\') $dir = $dir . '/';  
        $tpl->display($dir.$html);  
    }  
      
    /**
     * 创建目录
     * @param string $dir
     */  
    static public function createDir($dir) {  
        if (!is_dir($dir)) {  
            mkdir($dir, 0777);  
        }  
    }  
      
    /**
     * 创建文件（默认为空）
     * @param unknown_type $filename
     */  
    static public function createFile($filename) {  
        if (!is_file($filename)) touch($filename);  
    }  
      
    /**
     * 正确获取变量
     * @param string $param
     * @param string $type
     * @return string
     */  
    static public function getData($param, $type='post') {  
        $type = strtolower($type);  
        if ($type=='post') {  
            return Tool::mysqlString(trim($_POST[$param]));  
        } elseif ($type=='get') {  
            return Tool::mysqlString(trim($_GET[$param]));  
        }  
    }  
      
    /**
     * 删除文件
     * @param string $filename
     */  
    static public function delFile($filename) {  
        if (file_exists($filename)) unlink($filename);  
    }  
      
    /**
     * 删除目录
     * @param string $path
     */  
    static public function delDir($path) {  
        if (is_dir($path)) rmdir($path);  
    }  
      
    /**
     * 删除目录及地下的全部文件
     * @param string $dir
     * @return bool
     */  
    static public function delDirOfAll($dir) {  
        //先删除目录下的文件：  
        if (is_dir($dir)) {  
            $dh=opendir($dir);  
            while (!!$file=readdir($dh)) {  
                if($file!="." && $file!="..") {  
                    $fullpath=$dir."/".$file;  
                    if(!is_dir($fullpath)) {  
                        unlink($fullpath);  
                    } else {  
                        self::delDirOfAll($fullpath);  
                    }  
                }  
            }  
            closedir($dh);  
            //删除当前文件夹：  
            if(rmdir($dir)) {  
                return true;  
            } else {  
                return false;  
            }  
        }  
    }  
 
    /**
     * 验证登陆
     */  
    static public function validateLogin() {  
        if (empty($_SESSION['admin']['user'])) header('Location:/admin/');  
    }  
      
    /**
     * 给已经存在的图片添加水印
     * @param string $file_path
     * @return bool
     */  
    static public function addMark($file_path) {  
        if (file_exists($file_path) && file_exists(MARK)) {  
            //求出上传图片的名称后缀  
            $ext_name = strtolower(substr($file_path, strrpos($file_path, '.'), strlen($file_path)));  
            //$new_name='jzy_' . time() . rand(1000,9999) . $ext_name ;  
            $store_path = ROOT_PATH . UPDIR;  
            //求上传图片高宽  
            $imginfo = getimagesize($file_path);  
            $width = $imginfo[0];  
            $height = $imginfo[1];  
             //添加图片水印               
            switch($ext_name) {  
                case '.gif':  
                    $dst_im = imagecreatefromgif($file_path);  
                    break;  
                case '.jpg':  
                    $dst_im = imagecreatefromjpeg($file_path);  
                    break;  
                case '.png':  
                    $dst_im = imagecreatefrompng($file_path);  
                    break;  
            }  
            $src_im = imagecreatefrompng(MARK);  
            //求水印图片高宽  
            $src_imginfo = getimagesize(MARK);  
            $src_width = $src_imginfo[0];  
            $src_height = $src_imginfo[1];  
            //求出水印图片的实际生成位置  
            $src_x = $width - $src_width - 10;  
            $src_y = $height - $src_height - 10;  
            //新建一个真彩色图像  
            $nimage = imagecreatetruecolor($width, $height);                 
            //拷贝上传图片到真彩图像  
            imagecopy($nimage, $dst_im, 0, 0, 0, 0, $width, $height);            
            //按坐标位置拷贝水印图片到真彩图像上  
            imagecopy($nimage, $src_im, $src_x, $src_y, 0, 0, $src_width, $src_height);  
            //分情况输出生成后的水印图片  
            switch($ext_name) {  
                case '.gif':  
                    imagegif($nimage, $file_path);  
                    break;  
                case '.jpg':  
                    imagejpeg($nimage, $file_path);  
                    break;  
                case '.png':  
                    imagepng($nimage, $file_path);  
                    break;       
            }  
            //释放资源   
            imagedestroy($dst_im);  
            imagedestroy($src_im);  
            unset($imginfo);  
            unset($src_imginfo);  
            //移动生成后的图片  
            @move_uploaded_file($file_path, ROOT_PATH.UPDIR . $file_path);  
        }  
    }  
      
    /**
    *  中文截取2，单字节截取模式
    * @access public
    * @param string $str  需要截取的字符串
    * @param int $slen  截取的长度
    * @param int $startdd  开始标记处
    * @return string
    */  
    static public function cn_substr($str, $slen, $startdd=0){  
        $cfg_soft_lang = PAGECHARSET;  
        if($cfg_soft_lang=='utf-8') {  
            return self::cn_substr_utf8($str, $slen, $startdd);  
        }  
        $restr = '';  
        $c = '';  
        $str_len = strlen($str);  
        if($str_len             return '';  
        }  
        if($str_len             $slen = $str_len - $startdd;  
        }  
        $enddd = $startdd + $slen - 1;  
        for($i=0;$i             if($startdd==0) {  
                $restr .= $c;  
            } elseif($i > $startdd) {  
                $restr .= $c;  
            }  
            if(ord($str[$i])>0x80) {  
                if($str_len>$i+1) {  
                    $c = $str[$i].$str[$i+1];  
                }  
                $i++;  
            } else {  
                $c = $str[$i];  
            }  
            if($i >= $enddd) {  
                if(strlen($restr)+strlen($c)>$slen) {  
                    break;  
                } else {  
                    $restr .= $c;  
                    break;  
                }  
            }  
        }  
        return $restr;  
    }  
 
    /**
    *  utf-8中文截取，单字节截取模式
    *
    * @access public
    * @param string $str 需要截取的字符串
    * @param int $slen 截取的长度
    * @param int $startdd 开始标记处
    * @return string
    */  
    static public function cn_substr_utf8($str, $length, $start=0) {  
        if(strlen($str)             return '';  
        }  
        preg_match_all("/./su", $str, $ar);  
        $str = '';  
        $tstr = '';  
        //为了兼容mysql4.1以下版本,与数据库varchar一致,这里使用按字节截取  
        for($i=0; isset($ar[0][$i]); $i++) {  
            if(strlen($tstr)                 $tstr .= $ar[0][$i];  
            } else {  
                if(strlen($str)                     $str .= $ar[0][$i];  
                } else {  
                    break;  
                }  
            }  
        }  
        return $str;  
    }  
      
    /**
     * 删除图片，根据图片ID
     * @param int $image_id
     */  
    static function delPicByImageId($image_id) {  
        $db_name = PREFIX . 'images i';  
        $m = new Model();  
        $data = $m->getOne($db_name, "i.id={$image_id}", "i.path as p, i.big_img as b, i.small_img as s");  
        foreach ($data as $v) {  
            @self::delFile(ROOT_PATH . $v['p']);  
            @self::delFile(ROOT_PATH . $v['b']);  
            @self::delFile(ROOT_PATH . $v['s']);  
        }  
        $m->del(PREFIX . 'images', "id={$image_id}");  
        unset($m);  
    }  
      
    /**
     * 图片等比例缩放
     * @param resource $im    新建图片资源(imagecreatefromjpeg/imagecreatefrompng/imagecreatefromgif)
     * @param int $maxwidth   生成图像宽
     * @param int $maxheight  生成图像高
     * @param string $name    生成图像名称
     * @param string $filetype文件类型(.jpg/.gif/.png)
     */  
    static public function resizeImage($im, $maxwidth, $maxheight, $name, $filetype) {  
        $pic_width = imagesx($im);  
        $pic_height = imagesy($im);  
        if(($maxwidth && $pic_width > $maxwidth) || ($maxheight && $pic_height > $maxheight)) {  
            if($maxwidth && $pic_width>$maxwidth) {  
                $widthratio = $maxwidth/$pic_width;  
                $resizewidth_tag = true;  
            }  
            if($maxheight && $pic_height>$maxheight) {  
                $heightratio = $maxheight/$pic_height;  
                $resizeheight_tag = true;  
            }  
            if($resizewidth_tag && $resizeheight_tag) {  
                if($widthratio                     $ratio = $widthratio;  
                else  
                    $ratio = $heightratio;  
            }  
            if($resizewidth_tag && !$resizeheight_tag)  
                $ratio = $widthratio;  
            if($resizeheight_tag && !$resizewidth_tag)  
                $ratio = $heightratio;  
            $newwidth = $pic_width * $ratio;  
            $newheight = $pic_height * $ratio;  
            if(function_exists("imagecopyresampled")) {  
                $newim = imagecreatetruecolor($newwidth,$newheight);  
                imagecopyresampled($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);  
            } else {  
                $newim = imagecreate($newwidth,$newheight);  
                imagecopyresized($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);  
            }  
            $name = $name.$filetype;  
            imagejpeg($newim,$name);  
            imagedestroy($newim);  
        } else {  
            $name = $name.$filetype;  
            imagejpeg($im,$name);  
        }  
    }  
 
    /**
     * 下载文件
     * @param string $file_path 绝对路径
     */  
    static public function downFile($file_path) {  
        //判断文件是否存在  
        $file_path = iconv('utf-8', 'gb2312', $file_path); //对可能出现的中文名称进行转码  
        if (!file_exists($file_path)) {  
            exit('文件不存在！');  
        }  
        $file_name = basename($file_path); //获取文件名称  
        $file_size = filesize($file_path); //获取文件大小  
        $fp = fopen($file_path, 'r'); //以只读的方式打开文件  
        header("Content-type: application/octet-stream");  
        header("Accept-Ranges: bytes");  
        header("Accept-Length: {$file_size}");  
        header("Content-Disposition: attachment;filename={$file_name}");  
        $buffer = 1024;  
        $file_count = 0;  
        //判断文件是否结束  
        while (!feof($fp) && ($file_size-$file_count>0)) {  
            $file_data = fread($fp, $buffer);  
            $file_count += $buffer;  
            echo $file_data;  
        }  
        fclose($fp); //关闭文件  
    }  
}