这4个类分别是Mysql类、 分页类、缩略图类、上传类。

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Mysql类

    query($sql); } /** * 获取多行数据 * @param str $sql 查询语句 * @return arr 多行数据 */ public static function getAll($sql){ $data = array(); $res = self::query($sql); while($row = $res->fetch_assoc()){ $data[] = $row; } return $data; } /** * 获取一行数据 * @param str $row 查询语句 * @return arr 单行数据 */ public static function getRow($row){ $res = self::query($sql); return $res->fetch_assoc(); } /** * 获取单个结果 * @param str $sql 查询语句 * @return str 单个结果 */ public static function getOne($sql){ $res = self::query($sql); $data = $res->fetch_row(); return $data[0]; } /** * 插入/更新数据 * @param str $table 表名 * @param arr $data 插入/更新的数据 * @param str $act insert/update * @param str $where 更新条件 * @return bool 插入/更新是否成功 */ public static function exec($table,$data,$act='insert',$where='0'){ //插入操作 if($act == 'insert'){ $sql = 'insert into '.$table; $sql .= ' ('.implode(',',array_keys($data)).')'; $sql .= " values ('".implode("','",array_values($data))."')"; }else if($act == 'update'){ $sql = 'update '.$table.' set '; foreach ($data as $k => $v) { $sql .= $k.'='."'$v',"; } $sql = rtrim($sql,','); $sql .= ' where 1 and '.$where; } return self::query($sql); } /** * 获取最近一次插入的主键值 * @return int 主键 */ public static function getLastId(){ return self::conn()->insert_id; } /** * 获取最近一次操作影响的行数 * @return int 影响的行数 */ public static function getAffectedRows(){ return self::conn()->affected_rows; } /** * 关闭数据库连接 * @return bool 是否关闭 */ public static function close(){ return self::conn()->close(); } } ?>

 

 

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分页类

    num = $num; $this->cnt = $cnt; $this->curr = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]); $this->curr = $this->curr > 0 ? $this->curr : 1; $this->firstRow = $this->cnt * ($this->curr - 1); $this->getPage(); } /** * 分页方法 */ private function getPage(){ $page = ceil($this->num / $this->cnt);//总的页数 $left = max(1,$this->curr - floor($this->pageCnt/2));//计算最左边页码 $right = min($left + $this->pageCnt - 1 ,$page);//计算最右边页码 $left = max(1,$right - ($this->pageCnt - 1));//当前页码往右靠，需要重新计算左边页面的值 for($i=$left;$i<=$right;$i++){ if($i == 1){ $index = '第1页'; }else if($i == $page){ $index = '最后一页'; }else{ $index = '第'.$i.'页'; } $_GET['page'] = $i; $this->pageIndex[$index] = http_build_query($_GET); } } /** * 返回分页信息数据 * @return [type] [description] */ public function show(){ return $this->pageIndex; } } ?>

 

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缩略图类

    sourcePath = $sourcePath; //获取缩略图的大小 $this->thumbWidth = $thumbWidth; $this->thumbHeight = $thumbHeight; $this->thumbPath = $this->getThumbPath(); //计算大图的大小 list($this->sourceWidth,$this->sourceHeight,$this->sourceType) = getimagesize($this->sourcePath); } /** * 确定缩略图保存的路径 * @return [type] [description] */ private function getThumbPath(){ $ext = $this->getExt(); $filename = basename($this->sourcePath,'.'.$ext).'_thumb'.'.'.$ext; return $thumbPath = __DIR__.'/'.$filename; } /** * 获取原图的扩展名 * @return str 扩展名 */ private function getExt(){ return pathinfo($this->sourcePath,PATHINFO_EXTENSION); } /** * 检测原图的扩展名是否合法，并返回相应类型 * @return bool/str 原图的类型 */ public function getType(){ $typeArr = array( 1 => 'gif', 2 => 'jpeg', 3 => 'png', 15 => 'wbmp' ); if(!in_array($this->sourceType, array_keys($typeArr))){ return false; } return $typeArr[$this->sourceType]; } /** * 按照缩略图大小，计算大图的缩放比例 * @return float 缩放比例 */ public function calculateRate(){ return min($this->thumbWidth / $this->sourceWidth,$this->thumbHeight / $this->sourceHeight); } /** * 计算大图按照缩放比例后，最终的图像大小 * @param float $rate 缩放比例 * @return arr 缩放后的图片大小 */ public function getImageSizeByRate($rate){ $width = $this->sourceWidth * $rate; $height = $this->sourceHeight * $rate; return array('w'=>$width,'h'=>$height); } /** * 保存成文件 * @return [type] [description] */ public function saveFile($image){ $method = "image".$this->getType(); $method($image,$this->thumbPath); } /** * 进行绘画操作 * @return [type] [description] */ public function draw(){ if(!($type = $this->getType())){ echo "文件类型不支持"; return ; } //创建大图和小图的画布 $method = "imagecreatefrom".$type; $bigCanvas = $method($this->sourcePath); $smallCanvas = imagecreatetruecolor($this->thumbWidth, $this->thumbHeight); //创建白色画笔，并给小图画布填充背景 $white = imagecolorallocate($smallCanvas, 255, 255, 255); imagefill($smallCanvas, 0, 0, $white); //计算大图的缩放比例 $rate = $this->calculateRate(); //计算大图缩放后的大小信息 $info = $this->getImageSizeByRate($rate); //进行缩放 imagecopyresampled($smallCanvas, $bigCanvas, ($this->thumbWidth - $info['w']) / 2 , ($this->thumbHeight - $info['h']) / 2, 0, 0, $info['w'], $info['h'], $this->sourceWidth, $this->sourceHeight); //保存成文件 $this->saveFile($smallCanvas); //销毁画布 imagedestroy($bigCanvas); imagedestroy($smallCanvas); } } ?>

 

 

 

上传类

    
    getExt($filename); return in_array($ext,$this->allowExt); } /** * 检测文件大小是否超过限制 * @param int size 文件大小 * @return bool 文件大小是否超过限制 */ public function checkSize($size){ return $size < $this->maxSize * 1024 * 1024; } /** * 随机的文件名 * @param int $len 随机文件名的长度 * @return str 随机字符串 */ public function randName($len=6){ return substr(str_shuffle('abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ234565789'),0,$len); } /** * 创建文件上传到的路径 * @return str 文件上传的路径 */ public function createDir(){ $dir = './upload/'.date('Y/m/d',time()); if(is_dir($dir) || mkdir($dir,0777,true)){ return $dir; } } /** * 文件上传 * @param str $flag 文件上传标识 * @return arr 文件上传信息 */ public function uploadFile($flag){ if($_FILES[$flag]['name'] === '' || $_FILES[$flag]['error'] !== 0){ echo "没有上传文件"; return; } $info = $this->getInfo($flag); if(!$this->checkExt($info['name'])){ echo "不支持的文件类型"; return; } if(!$this->checkSize($info['size'])){ echo "文件大小超过限制"; return; } $filename = $this->randName().'.'.$this->getExt($info['name']); $dir = $this->createDir(); if(!move_uploaded_file($info['tmp_name'], $dir.'/'.$filename)){ echo "文件上传失败"; }else{ return array('filename'=>$filename,'dir'=>$dir); } } } ?>