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最完整PHP常用工具类大全

作者:用户 来源:互联网 时间:2017-12-01 19:53:14

常用工具

最完整PHP常用工具类大全 - 摘要: 本文讲的是最完整PHP常用工具类大全, <?php/** * 助手类 * @author www.shouce.ren */class Helper{ /** * 判断当前服务器系统 * @return string */ public static functio

<?php/** * 助手类 * @author www.shouce.ren */class Helper{	/**	 * 判断当前服务器系统	 * @return string	 */	public static function getOS(){		if(PATH_SEPARATOR == ':'){			return 'Linux';		}else{			return 'Windows';		}	}	/**	 * 当前微妙数	 * @return number	 */	public static function microtime_float() {		list ( $usec, $sec ) = explode ( " ", microtime () );		return (( float ) $usec + ( float ) $sec);	}	/**	 * 切割utf-8格式的字符串(一个汉字或者字符占一个字节)	 *	 * @author zhao jinhan	 * @version v1.0.0	 *	 */	public static function truncate_utf8_string($string, $length, $etc = '...') {		$result = '';		$string = html_entity_decode ( trim ( strip_tags ( $string ) ), ENT_QUOTES, 'UTF-8' );		$strlen = strlen ( $string );		for($i = 0; (($i < $strlen) && ($length > 0)); $i ++) {			if ($number = strpos ( str_pad ( decbin ( ord ( substr ( $string, $i, 1 ) ) ), 8, '0', STR_PAD_LEFT ), '0' )) {				if ($length < 1.0) {					break;				}				$result .= substr ( $string, $i, $number );				$length -= 1.0;				$i += $number - 1;			} else {				$result .= substr ( $string, $i, 1 );				$length -= 0.5;			}		}		$result = htmlspecialchars ( $result, ENT_QUOTES, 'UTF-8' );		if ($i < $strlen) {			$result .= $etc;		}		return $result;	}	/**	 * 遍历文件夹	 * @param string $dir	 * @param boolean $all  true表示递归遍历	 * @return array	 */	public static function scanfDir($dir='', $all = false, &$ret = array()){		if ( false !== ($handle = opendir ( $dir ))) {			while ( false !== ($file = readdir ( $handle )) ) {				if (!in_array($file, array('.', '..', '.git', '.gitignore', '.svn', '.htaccess', '.buildpath','.project'))) {					$cur_path = $dir . '/' . $file;					if (is_dir ( $cur_path )) {						$ret['dirs'][] =$cur_path;						$all && self::scanfDir( $cur_path, $all, $ret);					} else {						$ret ['files'] [] = $cur_path;					}				}			}			closedir ( $handle );		}		return $ret;	}	/**	 * 邮件发送	 * @param string $toemail	 * @param string $subject	 * @param string $message	 * @return boolean	 */	public static function sendMail($toemail = '', $subject = '', $message = '') {		$mailer = Yii::createComponent ( 'application.extensions.mailer.EMailer' );		//邮件配置		$mailer->SetLanguage('zh_cn');		$mailer->Host = Yii::app()->params['emailHost']; //发送邮件服务器		$mailer->Port = Yii::app()->params['emailPort']; //邮件端口		$mailer->Timeout = Yii::app()->params['emailTimeout'];//邮件发送超时时间		$mailer->ContentType = 'text/html';//设置html格式		$mailer->SMTPAuth = true;		$mailer->Username = Yii::app()->params['emailUserName'];		$mailer->Password = Yii::app()->params['emailPassword'];		$mailer->IsSMTP ();		$mailer->From = $mailer->Username; // 发件人邮箱		$mailer->FromName = Yii::app()->params['emailFormName']; // 发件人姓名		$mailer->AddReplyTo ( $mailer->Username );		$mailer->CharSet = 'UTF-8';		// 添加邮件日志		$modelMail = new MailLog ();		$modelMail->accept = $toemail;		$modelMail->subject = $subject;		$modelMail->message = $message;		$modelMail->send_status = 'waiting';		$modelMail->save ();		// 发送邮件		$mailer->AddAddress ( $toemail );		$mailer->Subject = $subject;		$mailer->Body = $message;		if ($mailer->Send () === true) {			$modelMail->times = $modelMail->times + 1;			$modelMail->send_status = 'success';			$modelMail->save ();			return true;		} else {			$error = $mailer->ErrorInfo;			$modelMail->times = $modelMail->times + 1;			$modelMail->send_status = 'failed';			$modelMail->error = $error;			$modelMail->save ();			return false;		}	}	/**	 * 判断字符串是utf-8 还是gb2312	 * @param unknown $str	 * @param string $default	 * @return string	 */	public static function utf8_gb2312($str, $default = 'gb2312')	{	    $str = preg_replace("/[/x01-/x7F]+/", "", $str);	    if (empty($str)) return $default;	    $preg =  array(	        "gb2312" => "/^([/xA1-/xF7][/xA0-/xFE])+$/", //正则判断是否是gb2312	        "utf-8" => "/^[/x{4E00}-/x{9FA5}]+$/u",      //正则判断是否是汉字(utf8编码的条件了),这个范围实际上已经包含了繁体中文字了	    );	    if ($default == 'gb2312') {	        $option = 'utf-8';	    } else {	        $option = 'gb2312';	    }	    if (!preg_match($preg[$default], $str)) {	        return $option;	    }	    $str = @iconv($default, $option, $str);	    //不能转成 $option, 说明原来的不是 $default	    if (empty($str)) {	        return $option;	    }	    return $default;	}	/**	 * utf-8和gb2312自动转化	 * @param unknown $string	 * @param string $outEncoding	 * @return unknown|string	 */	public static function safeEncoding($string,$outEncoding = 'UTF-8')	{		$encoding = "UTF-8";		for($i = 0; $i < strlen ( $string ); $i ++) {			if (ord ( $string {$i} ) < 128)				continue;			if ((ord ( $string {$i} ) & 224) == 224) {				// 第一个字节判断通过				$char = $string {++ $i};				if ((ord ( $char ) & 128) == 128) {					// 第二个字节判断通过					$char = $string {++ $i};					if ((ord ( $char ) & 128) == 128) {						$encoding = "UTF-8";						break;					}				}			}			if ((ord ( $string {$i} ) & 192) == 192) {				// 第一个字节判断通过				$char = $string {++ $i};				if ((ord ( $char ) & 128) == 128) {					// 第二个字节判断通过					$encoding = "GB2312";					break;				}			}		}		if (strtoupper ( $encoding ) == strtoupper ( $outEncoding ))			return $string;		else			return @iconv ( $encoding, $outEncoding, $string );	}	/**	 * 返回二维数组中某个键名的所有值	 * @param input $array	 * @param string $key	 * @return array	 */	public static function array_key_values($array =array(), $key='')	{		$ret = array();		foreach((array)$array as $k=>$v){			$ret[$k] = $v[$key];		}		return $ret;	}	/**	 * 判断 文件/目录 是否可写(取代系统自带的 is_writeable 函数)	 * @param string $file 文件/目录	 * @return boolean	 */	public static function is_writeable($file) {		if (is_dir($file)){			$dir = $file;			if ($fp = @fopen("$dir/test.txt", 'w')) {				@fclose($fp);				@unlink("$dir/test.txt");				$writeable = 1;			} else {				$writeable = 0;			}		} else {			if ($fp = @fopen($file, 'a+')) {				@fclose($fp);				$writeable = 1;			} else {				$writeable = 0;			}		}		return $writeable;	}	/**	 * 格式化单位	 */	static public function byteFormat( $size, $dec = 2 ) {		$a = array ( "B" , "KB" , "MB" , "GB" , "TB" , "PB" );		$pos = 0;		while ( $size >= 1024 ) {			$size /= 1024;			$pos ++;		}		return round( $size, $dec ) . " " . $a[$pos];	}	/**	 * 下拉框,单选按钮 自动选择	 *	 * @param $string 输入字符	 * @param $param  条件	 * @param $type   类型	 * selected checked	 * @return string	 */	static public function selected( $string, $param = 1, $type = 'select' ) {		$true = false;		if ( is_array( $param ) ) {			$true = in_array( $string, $param );		}elseif ( $string == $param ) {			$true = true;		}		$return='';		if ( $true )			$return = $type == 'select' ? 'selected="selected"' : 'checked="checked"';		echo $return;	}	/**	 * 下载远程图片	 * @param string $url 图片的绝对url	 * @param string $filepath 文件的完整路径(例如/www/images/test) ,此函数会自动根据图片url和http头信息确定图片的后缀名	 * @param string $filename 要保存的文件名(不含扩展名)	 * @return mixed 下载成功返回一个描述图片信息的数组,下载失败则返回false	 */	static public function downloadImage($url, $filepath, $filename) {		//服务器返回的头信息		$responseHeaders = array();		//原始图片名		$originalfilename = '';		//图片的后缀名		$ext = '';		$ch = curl_init($url);		//设置curl_exec返回的值包含Http头		curl_setopt($ch, CURLOPT_HEADER, 1);		//设置curl_exec返回的值包含Http内容		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);		//设置抓取跳转(http 301,302)后的页面		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);		//设置最多的HTTP重定向的数量		curl_setopt($ch, CURLOPT_MAXREDIRS, 3);		//服务器返回的数据(包括http头信息和内容)		$html = curl_exec($ch);		//获取此次抓取的相关信息		$httpinfo = curl_getinfo($ch);		curl_close($ch);		if ($html !== false) {			//分离response的header和body,由于服务器可能使用了302跳转,所以此处需要将字符串分离为 2+跳转次数 个子串			$httpArr = explode("/r/n/r/n", $html, 2 + $httpinfo['redirect_count']);			//倒数第二段是服务器最后一次response的http头			$header = $httpArr[count($httpArr) - 2];			//倒数第一段是服务器最后一次response的内容			$body = $httpArr[count($httpArr) - 1];			$header.="/r/n";			//获取最后一次response的header信息			preg_match_all('/([a-z0-9-_]+):/s*([^/r/n]+)/r/n/i', $header, $matches);			if (!empty($matches) && count($matches) == 3 && !empty($matches[1]) && !empty($matches[1])) {				for ($i = 0; $i < count($matches[1]); $i++) {					if (array_key_exists($i, $matches[2])) {						$responseHeaders[$matches[1][$i]] = $matches[2][$i];					}				}			}			//获取图片后缀名			if (0 < preg_match('{(?:[^//////]+)/.(jpg|jpeg|gif|png|bmp)$}i', $url, $matches)) {				$originalfilename = $matches[0];				$ext = $matches[1];			} else {				if (array_key_exists('Content-Type', $responseHeaders)) {					if (0 < preg_match('{image/(/w+)}i', $responseHeaders['Content-Type'], $extmatches)) {						$ext = $extmatches[1];					}				}			}			//保存文件			if (!empty($ext)) {				//如果目录不存在,则先要创建目录				if(!is_dir($filepath)){					mkdir($filepath, 0777, true);				}				$filepath .= '/'.$filename.".$ext";				$local_file = fopen($filepath, 'w');				if (false !== $local_file) {					if (false !== fwrite($local_file, $body)) {						fclose($local_file);						$sizeinfo = getimagesize($filepath);						return array('filepath' => realpath($filepath), 'width' => $sizeinfo[0], 'height' => $sizeinfo[1], 'orginalfilename' => $originalfilename, 'filename' => pathinfo($filepath, PATHINFO_BASENAME));					}				}			}		}		return false;	}	/**	 * 查找ip是否在某个段位里面	 * @param string $ip 要查询的ip	 * @param $arrIP     禁止的ip	 * @return boolean	 */	public static function ipAccess($ip='0.0.0.0', $arrIP = array()){		$access = true;		$ip && $arr_cur_ip = explode('.', $ip);		foreach((array)$arrIP as $key=> $value){			if($value == '*.*.*.*'){				$access = false; //禁止所有				break;			}			$tmp_arr = explode('.', $value);			if(($arr_cur_ip[0] == $tmp_arr[0]) && ($arr_cur_ip[1] == $tmp_arr[1])) {				//前两段相同				if(($arr_cur_ip[2] == $tmp_arr[2]) || ($tmp_arr[2] == '*')){					//第三段为* 或者相同					if(($arr_cur_ip[3] == $tmp_arr[3]) || ($tmp_arr[3] == '*')){						//第四段为* 或者相同						$access = false; //在禁止ip列,则禁止访问						break;					}				}			}		}		return $access;	}	/**	 * @param string $string 原文或者密文	 * @param string $operation 操作(ENCODE | DECODE), 默认为 DECODE	 * @param string $key 密钥	 * @param int $expiry 密文有效期, 加密时候有效, 单位 秒,0 为永久有效	 * @return string 处理后的 原文或者 经过 base64_encode 处理后的密文	 *	 * @example	 *	 * $a = authcode('abc', 'ENCODE', 'key');	 * $b = authcode($a, 'DECODE', 'key');  // $b(abc)	 *	 * $a = authcode('abc', 'ENCODE', 'key', 3600);	 * $b = authcode('abc', 'DECODE', 'key'); // 在一个小时内,$b(abc),否则 $b 为空	 */	public static function authcode($string, $operation = 'DECODE', $key = '', $expiry = 3600) {		$ckey_length = 4;		// 随机密钥长度 取值 0-32;		// 加入随机密钥,可以令密文无任何规律,即便是原文和密钥完全相同,加密结果也会每次不同,增大破解难度。		// 取值越大,密文变动规律越大,密文变化 = 16 的 $ckey_length 次方		// 当此值为 0 时,则不产生随机密钥		$key = md5 ( $key ? $key : 'key' ); //这里可以填写默认key值		$keya = md5 ( substr ( $key, 0, 16 ) );		$keyb = md5 ( substr ( $key, 16, 16 ) );		$keyc = $ckey_length ? ($operation == 'DECODE' ? substr ( $string, 0, $ckey_length ) : substr ( md5 ( microtime () ), - $ckey_length )) : '';		$cryptkey = $keya . md5 ( $keya . $keyc );		$key_length = strlen ( $cryptkey );		$string = $operation == 'DECODE' ? base64_decode ( substr ( $string, $ckey_length ) ) : sprintf ( '%010d', $expiry ? $expiry + time () : 0 ) . substr ( md5 ( $string . $keyb ), 0, 16 ) . $string;		$string_length = strlen ( $string );		$result = '';		$box = range ( 0, 255 );		$rndkey = array ();		for($i = 0; $i <= 255; $i ++) {			$rndkey [$i] = ord ( $cryptkey [$i % $key_length] );		}		for($j = $i = 0; $i < 256; $i ++) {			$j = ($j + $box [$i] + $rndkey [$i]) % 256;			$tmp = $box [$i];			$box [$i] = $box [$j];			$box [$j] = $tmp;		}		for($a = $j = $i = 0; $i < $string_length; $i ++) {			$a = ($a + 1) % 256;			$j = ($j + $box [$a]) % 256;			$tmp = $box [$a];			$box [$a] = $box [$j];			$box [$j] = $tmp;			$result .= chr ( ord ( $string [$i] ) ^ ($box [($box [$a] + $box [$j]) % 256]) );		}		if ($operation == 'DECODE') {			if ((substr ( $result, 0, 10 ) == 0 || substr ( $result, 0, 10 ) - time () > 0) && substr ( $result, 10, 16 ) == substr ( md5 ( substr ( $result, 26 ) . $keyb ), 0, 16 )) {				return substr ( $result, 26 );			} else {				return '';			}		} else {			return $keyc . str_replace ( '=', '', base64_encode ( $result ) );		}	}	public static function gbkToUtf8($str){		return iconv("GBK", "UTF-8", $str);	}	/**	 * 取得输入目录所包含的所有目录和文件	 * 以关联数组形式返回	 * author: flynetcn	 */	static public function deepScanDir($dir)	{		$fileArr = array();		$dirArr = array();		$dir = rtrim($dir, '//');		if(is_dir($dir)){			$dirHandle = opendir($dir);			while(false !== ($fileName = readdir($dirHandle))){				$subFile = $dir . DIRECTORY_SEPARATOR . $fileName;				if(is_file($subFile)){					$fileArr[] = $subFile;				} elseif (is_dir($subFile) && str_replace('.', '', $fileName)!=''){					$dirArr[] = $subFile;					$arr = self::deepScanDir($subFile);					$dirArr = array_merge($dirArr, $arr['dir']);					$fileArr = array_merge($fileArr, $arr['file']);				}			}			closedir($dirHandle);		}		return array('dir'=>$dirArr, 'file'=>$fileArr);	}	/**	 * 取得输入目录所包含的所有文件	 * 以数组形式返回	 * author: flynetcn	 */	static public function get_dir_files($dir)	{		if (is_file($dir)) {			return array($dir);		}		$files = array();		if (is_dir($dir) && ($dir_p = opendir($dir))) {			$ds = DIRECTORY_SEPARATOR;			while (($filename = readdir($dir_p)) !== false) {				if ($filename=='.' || $filename=='..') { continue; }				$filetype = filetype($dir.$ds.$filename);				if ($filetype == 'dir') {					$files = array_merge($files, self::get_dir_files($dir.$ds.$filename));				} elseif ($filetype == 'file') {					$files[] = $dir.$ds.$filename;				}			}			closedir($dir_p);		}		return $files;	}	/**	 * 删除文件夹及其文件夹下所有文件	 */	public static function deldir($dir) {		//先删除目录下的文件:		$dh=opendir($dir);		while ($file=readdir($dh)) {			if($file!="." && $file!="..") {				$fullpath=$dir."/".$file;				if(!is_dir($fullpath)) {					unlink($fullpath);				} else {					self::deldir($fullpath);				}			}		}		closedir($dh);		//删除当前文件夹:		if(rmdir($dir)) {			return true;		} else {			return false;		}	}		/**		 * js 弹窗并且跳转		 * @param string $_info		 * @param string $_url		 * @return js		 */		static public function alertLocation($_info, $_url) {			echo "<script type='text/javascript'>alert('$_info');location.href='$_url';</script>";			exit();		}		/**		 * js 弹窗返回		 * @param string $_info		 * @return js		 */		static public function alertBack($_info) {			echo "<script type='text/javascript'>alert('$_info');history.back();</script>";			exit();		}		/**		 * 页面跳转		 * @param string $url		 * @return js		 */		static public function headerUrl($url) {			echo "<script type='text/javascript'>location.href='{$url}';</script>";			exit();		}		/**		 * 弹窗关闭		 * @param string $_info		 * @return js		 */		static public function alertClose($_info) {			echo "<script type='text/javascript'>alert('$_info');close();</script>";			exit();		}		/**		 * 弹窗		 * @param string $_info		 * @return js		 */		static public function alert($_info) {			echo "<script type='text/javascript'>alert('$_info');</script>";			exit();		}		/**		 * 系统基本参数上传图片专用		 * @param string $_path		 * @return null		 */		static public function sysUploadImg($_path) {			echo '<script type="text/javascript">document.getElementById("logo").value="'.$_path.'";</script>';			echo '<script type="text/javascript">document.getElementById("pic").src="'.$_path.'";</script>';			echo '<script type="text/javascript">$("#loginpop1").hide();</script>';			echo '<script type="text/javascript">$("#bgloginpop2").hide();</script>';		}		/**		 * 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] = self::htmlString($_value);  //递归				}			} elseif (is_object($_date)) {				foreach ($_date as $_key=>$_value) {					$_string->$_key = self::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 ($type=='post') {				return self::mysqlString(trim($_POST[$param]));			} elseif ($type=='get') {				return self::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 < $startdd+1) {				return '';			}			if($str_len < $startdd + $slen || $slen==0) {				$slen = $str_len - $startdd;			}			$enddd = $startdd + $slen - 1;			for($i=0;$i<$str_len;$i++) {				if($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) < $start+1) {				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) < $start) {					$tstr .= $ar[0][$i];				} else {					if(strlen($str) < $length + strlen($ar[0][$i]) ) {						$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<$heightratio)						$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		}	}

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