文件上传类

<?php
class Upload {
    /*
	* Upload类 包含了文件上传、图片添加水印、图片截取、图片缩略
	* author Ming
	* date 2016-05-14 15:07
	*/
	
	//文件类型
	public $type = array('gif','png','jpg','jpeg');
	
	//文件命名
	public $name;
	
	//上传大小限制，单位B
	public $max_size = 2048000;
	
	//文件保存的目录
	public $path;
	
	//图片访问路径前缀
	public $url_prefix = '';
	
	//是否添加水印，wm_image和wm_text，只能选择其中的一种属性
	//position int 水印位置安排（1-10）【1:左头顶；2:中间头顶；3:右头顶...值空:随机位置】
	public $is_watermark = false;
	
	//给图片添加水印图片，格式 array('image_url','position'); 
	//例：array('../images/watermark.png','9')
	public $wm_image;
	
	//给图片添加水印文字，格式 array('text','fontsize','fontcolor','position'); 
	//例：array('watermark','14','#CC0000','9');
	public $wm_text;
	
	//可以水印图片最小尺寸 array('width','height');
	//例：array(200,200);
	public $min_source_can_wm;
	
	//是否生成缩略图 bool
	public $is_thumb = false;
	
	//缩略图的比例（10% 或者 100px）
	public $thumb_ratio;
	
	//是否截图 bool
	public $is_screenshot = false;
	
	//截图的数据 array('width'=>100,'height'=>100);
	public $screenshot_ratio;
	
	
	//提示说明
	private $msg;
	
	//图片后缀名
	private $exten;
	
	/*
	* 功能介绍：上传文件方法
	* return array 图片路径
	*/
	public function upload_file($FileName=''){
	    if(empty($FileName)){
			foreach($_FILES as $value){
				$file_local = $value['tmp_name'];
				$this->exten = pathinfo($value['name'], PATHINFO_EXTENSION);//后缀名
				$file_error = $value['error'];
				$size = $value['size'];
			}
		}else{
		    $file_local = $_FILES[$FileName]['tmp_name'];
			$this->exten = pathinfo($_FILES[$FileName]['name'], PATHINFO_EXTENSION);//后缀名
			$file_error = $_FILES[$FileName]['error'];
			$size = $_FILES[$FileName]['size'];
		}
		
		//检查保存文件的目录是否存在
		if(!$this->dirfn()){
		    $this->err_code = 1;
            return false;
		}
		
		//检查该后缀名是否允许上传
		if(!in_array($this->exten, $this->type, true)){
		    $this->err_code = 2;
            return false;
		}
		
		//检查该图片的大小
		if($this->max_size < $size){
		    $this->err_code = 3;
            return false;
		}
		
		//文件保存路径
		if(empty($this->name)){
		    $this->name = time().mt_rand(1000,9999);
		}
		$url = $this->path . $this->name . '.' . $this->exten;
		
		//保存
		$result = move_uploaded_file($file_local, $url);
		
		if($result && $file_error==0){
		    chmod($url, 0777);
			$data = array();
			
			//是否生成缩略图片
			if($this->is_thumb){
				$data['thumb'] = $this->set_thumb($url);//缩略图路径
			}
			
			//是否需要截图
			if($this->is_screenshot){
				$data['screenshot'] = $this->set_screenshot($url);//截图路径
			}
			
			//是否添加水印
			if($this->is_watermark){
				if(!$this->watermarkfn($url)){
				    $this->err_code = 11;
                    return false;
				}
			}
			$data['image'] = $this->urlfn($url);//原图路径
			
			return $data;
		}else{
		    switch ($file_error){
				case 1:
					$this->msg = '文件大小超出了服务器的空间大小';
				break;
				case 2:
					$this->msg = '要上传的文件大小超出浏览器限制';
				break;
				case 3:
					$this->msg = '文件仅部分被上传';
				break;
				case 4:
					$this->msg = '没有找到要上传的文件';
				break;
				case 5:
					$this->msg = '服务器临时文件夹丢失';
				break;
				case 6:
					$this->msg = '文件写入到临时文件夹出错';
				break;
			}
			$this->err_code = 4;
            return false;
		}
	}
	
	
	/*
	* 功能介绍：读取图片信息
	* return 图片资源
	*/
	private function get_image_info($url, $exten=''){
		$exten = empty($exten) ? $this->exten : $exten;
		
		//获取图片宽高
		list($width, $height) = getimagesize($url);
		
		//创建画布
		switch($exten){
			case 'jpg':
			case 'jpeg':
				$source = @imagecreatefromjpeg($url);
				break;
			case 'png':
				$source = @imagecreatefrompng($url);
				imagesavealpha($source,true);
				break;
			case 'gif':
				$source = @imagecreatefromgif($url);
				break;
			default:
				$this->msg = '不能创建画布';
				$this->err_code = 6;
                return false;
		}
		
		return array(
		    'width' => $width,
		    'height' => $height,
		    'source' => $source,
		);
	}
	
	/*
	* 功能介绍：生成缩略图
	* return 图片路径
	*/
	private function set_thumb($url){
	    //资源信息
		$info = $this->get_image_info($url);
		
		if(empty($this->thumb_ratio)){
		    $this->err_code = 6;
            return false;
		}
		
		if(stripos($this->thumb_ratio, '%')){
		    $multiple = (float)$this->thumb_ratio; //比例
			$new_width = $info['width'] * $multiple; //缩略图的宽度
			$new_height = $info['height'] * $multiple; //缩略图的高度
			
		}else if(stripos($this->thumb_ratio, 'px')){
		    $new_width = (int)$this->thumb_ratio; //缩略图的宽度
			$new_height = $new_width * $info['height'] / $info['width']; //缩略图的高度
		}
		
		//新建彩色图像
		$thumb = imageCreateTrueColor($new_width, $new_height);
		imagealphablending($thumb, false);
		imagesavealpha($thumb, true);
		
		@imagecopyresized($thumb, $info['source'], 0, 0, 0, 0, $new_width, $new_height, $info['width'], $info['height']);
		
		//缩略图url
		$url_info = pathinfo($url);
		$this->path = $url_info['dirname'].'/s/';
		$s_name = $url_info['basename'];
		$s_url = $this->path . $s_name;//缩略图的路径
		
		if($this->dirfn()){
		    $this->keep_image_info($thumb, $s_url);
			return $this->urlfn($url);
		}else{
		    $this->err_code = 9;
            return false;
		}
	}
	
	/*
	* 功能介绍：截图
	* return 图片路径
	*/
	private function set_screenshot($url){
	    //资源信息
		$info = $this->get_image_info($url);
		
		if(empty($this->screenshot_ratio) || !is_array($this->screenshot_ratio)){
		    $this->err_code = 8;
            return false;
		}
		
		$size = $this->screenshot_ratio;
		
		
		//宽度截图规则：谁小就取谁
		if($size['width'] <= $info['width']){
		    $new_width = $size['width'];
			$start_width = ($info['width'] - $size['width']) / 2; //开始截图的宽度
		}else{
		    $new_width = $info['width'];
			$start_width = 0;
		}
		
		//高度截图规则：谁小就取谁
		if($size['height'] <= $info['height']){
		    $new_height = $size['height']; 
			$start_height = ($info['height'] - $size['height']) / 2; //开始截图的高度
		}else{
		    $new_height = $info['height'];
			$start_height = 0;
		}
		
		//新建彩色图像 
		$screenshot = imageCreateTrueColor($new_width, $new_height);
		imagealphablending($screenshot, false);
		imagesavealpha($screenshot, true);
		
		@imagecopyresized($screenshot, $info['source'], 0, 0, $start_width, $start_height, $new_width, $new_height, $new_width, $new_height);
		
		//截图url
		$url_info = pathinfo($url);
		$this->path = $url_info['dirname'].'/c/';
		$c_name = $url_info['basename'];
		$c_url = $this->path . $c_name;//截图的路径
		
		if($this->dirfn()){
		    $this->keep_image_info($screenshot, $c_url);
			return $this->urlfn($url);
		}else{
		    $this->err_code = 10;
            return false;
		}
	}
	
	/*
	* 功能介绍：添加水印
	*/
	public function watermarkfn($url){
	    //默认
		$this->w_pct = 70; //透明度
		$position = 9; //位置
		$min_size = array(200,200);
		

        if(!$this->check($url)) return false;
		
		//设置范围：少于最小尺寸就不添加水印
		if(!empty($this->min_source_can_wm)){
		    $min_size = $this->min_source_can_wm;
		}
		
		//原图资源信息
		$source_info = getimagesize($url);//图片信息
		$source_w  = $source_info[0];//图片宽度
		$source_h  = $source_info[1];//图片高度
		
		//尺寸少于最小尺寸，不添加水印
		if($source_w < $min_size[0] || $source_h < $min_size[1]) return true;
		
		switch($source_info[2]) { //图片类型
			case 1 : //GIF格式
				$source_img = imagecreatefromgif($url);
				break;
			case 2 : //JPG格式
				$source_img = imagecreatefromjpeg($url);
				break;
			case 3 : //PNG格式
				$source_img = imagecreatefrompng($url);
				imagesavealpha($source_img,true);
				break;
			default :
				return false;
		}
		
		//水印图片
		if(!empty($this->wm_image)){
		    $ifwaterimage = 1; //标记
			
			$water_img = $this->wm_image;
			$w_img = $water_img[0];
			
			//检查水印图片是否有效
			if(!empty($w_img) && file_exists($w_img)){
			    
				//水印图片资源信息
				$water_info  = getimagesize($w_img);
				$width    = $water_info[0];
				$height    = $water_info[1];
				
				switch($water_info[2]) {
					case 1 :
						$wm_source = imagecreatefromgif($w_img);
						break;
					case 2 :
						$wm_source = imagecreatefromjpeg($w_img);
						break;
					case 3 :
						$wm_source = imagecreatefrompng($w_img);
						imagealphablending($w_img,false);
						imagesavealpha($w_img,true);
						break;
					default :
						return;
				}
				$position = empty($water_img[1]) ? $position : $water_img[1];
				
			}else{
			    $this->err_code = 13;
                return false;
			}
			
		//水印文字
		}else if(!empty($this->wm_text)){
		    $ifwaterimage = 0;
			
			$text_info = $this->wm_text;
			$w_text = empty($text_info[0]) ? 'watermark' : $text_info[0];
			$w_font = empty($text_info[1]) ? 14 : $text_info[1];
			$w_color = empty($text_info[2]) ? '#CC0000' : $text_info[2];
			$position = empty($text_info[3]) ? $position : $text_info[3];
			
			$temp = imagettfbbox(ceil($w_font*2.5), 0, './includes/texb.ttf', $w_text); //imagettfbbox返回一个含有 8 个单元的数组表示了文本外框的四个角
			$width = $temp[2] - $temp[6];
			$height = $temp[3] - $temp[7];
			unset($temp);
		}else{
		    $this->err_code = 12;
            return false;
		}
		
		switch($position) {
			case 1:
				$wx = 5;
				$wy = 5;
				break;
			case 2:
				$wx = ($source_w - $width) / 2;
				$wy = 0;
				break;
			case 3:
				$wx = $source_w - $width;
				$wy = 0;
				break;
			case 4:
				$wx = 0;
				$wy = ($source_h - $height) / 2;
				break;
			case 5:
				$wx = ($source_w - $width) / 2;
				$wy = ($source_h - $height) / 2;
				break;
			case 6:
				$wx = $source_w - $width;
				$wy = ($source_h - $height) / 2;
				 break;
			case 7:
				$wx = 0;
				$wy = $source_h - $height;
				break;
			case 8:
				$wx = ($source_w - $width) / 2;
				$wy = $source_h - $height;
				break;
			case 9:
				$wx = $source_w - ($width+5);
				$wy = $source_h - ($height+5);
				break;
			case 10:
				$wx = rand(0,($source_w - $width));
				$wy = rand(0,($source_h - $height));
				break;       
			default:
				$wx = rand(0,($source_w - $width));
				$wy = rand(0,($source_h - $height));
				break;
		}
		
		if($ifwaterimage){
			if($water_info[2] == 3){ //PNG格式
				imagecopy($source_img, $wm_source, $wx, $wy, 0, 0, $width, $height);
			}else{
				imagecopymerge($source_img, $wm_source, $wx, $wy, 0, 0, $width, $height, $this->w_pct);
			}
		}else{
			if(!empty($w_color) && (strlen($w_color)==7)) {
				$r = hexdec(substr($w_color,1,2));
				$g = hexdec(substr($w_color,3,2));
				$b = hexdec(substr($w_color,5));
			}else{
				return;
			}
			imagestring($source_img,$w_font,$wx,$wy,$w_text,imagecolorallocate($source_img,$r,$g,$b));
		}
		
		//输出图片
		switch($source_info[2]) {
			case 1 :
				imagegif($source_img, $url);
				break;
			case 2 :
				imagejpeg($source_img, $url, 80);
				break;
			case 3 :
				imagepng($source_img, $url);
				break;
			default :
				return;
		}
		
		if(isset($wm_source)) {
			imagedestroy($wm_source);
		}
		imagedestroy($source_img);
		return true;
	}
	
	/*鉴定图片信息*/
	public function check($image){
		return extension_loaded('gd') && preg_match("/\.(jpg|jpeg|gif|png)/i", $image, $m) && file_exists($image) && function_exists('imagecreatefrom'.($m[1] == 'jpg' ? 'jpeg' : $m[1]));
	}
	
	/*
	* 功能介绍：保存处理后的图片
	*/
	private function keep_image_info($image_source, $url, $exten=''){
		$exten = empty($exten) ? $this->exten : $exten;
		switch($exten){
			case 'jpg':
			case 'jpeg':
				imagejpeg($image_source, $url, 80);
			    break;
			case 'png':
				imagepng($image_source, $url, 8);
			    break;
			case 'gif':
				imagegif($image_source, $url, 100);
			    break;
		}
		//释放资源
		imagedestroy($image_source);
		return;
	}
	
	/*
	* 功能介绍：检查是否存在目录，如果不存在就创建该目录
	* $dir string 目录
	* return true or false
	*/
	private function dirfn(){
	    $dir = rtrim($this->path, '/').'/';
		if(!file_exists($dir)){
			mkdir($dir,0777,true);
			chmod($dir,0777);
		}
		return is_dir($dir);
	}
	
	/*
	* 功能介绍：路径处理
	* $url string 路径
	* return string
	*/
	private function urlfn($url){
	    if(empty($this->url_prefix)){
			return $url;
		}else{
			return $this->url_prefix . ltrim($url, '../');
		}
	}
	
	/*
	* 功能介绍：错误返回
	* return string
	*/
	public function get_error(){
	    if(!$this->err_code) return false;
        $err_msg = array(
            '0' => $this->msg,
			'1' => $this->path.'目录不存在&创建目录失败，请检查目录权限',
            '2' => '文件类型不符合，允许上传的文件后缀是：'.implode('、',$this->type),
            '3' => '文件大小不符：只允许上传少于2M的图片',
            '4' => '上传失败，原因是：'.$this->msg,
            '5' => '上传文件失败',
            '6' => '图片损坏了'.$this->msg,
			'7' => '请配置好缩略图与原图的比例',
			'8' => '请配置好截取图片的尺寸',
			'9' => '缩略图目录不存在&创建目录失败，请检查目录权限',
			'10' => '截图目录不存在&创建目录失败，请检查目录权限',
			'11' => '添加水印失败',
			'12' => '请设置好添加水印的参数',
			'13' => '水印图片无效，请重新设置或检查水印图片路径',
        );
        return $err_msg[$this->err_code];
	}
}
?>