最完整PHP惯用工具类大全-php教程-PHP中文網

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 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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