php图片上传类（支持缩放、裁剪、图片缩略功能）

1. 代码：

   <?php
   namespace dollarphp;
   /**
   * @desc：图片上传类
   * @author [Lee] <[<complet@163.com>]>
   * 1、自动验证文件是表单提交的文件还是base64流提交的文件
   * 2、验证图片类型是否合法
   * 3、验证图片尺寸是否合法
   * 4、验证图片大小是否合法
   * 5、支持获取图片信息功能
   * 6、支持缩放功能
   * 7、支持裁剪功能
   * 8、支持缩略图功能
   */
   class image{
   private $file;
   private $type;
   public $suffix = array();
   public $measure = array();
   public $size = array();
   public $scale = array(
           'is_scale'=>0,
           'ratio'=>1
       );
   public $crop = array(
           'is_crop'=>0,
           'width'=>0,
           'height'=>0
       );
   public $thumb = array(
           'is_thumb'=>0,
           'width'=>0,
           'height'=>0
       );
   public function __construct($file){
       $this->file = $file;
       $this->getType();
   }
   /*
    内部方法：获取图片类型
    1、多文件
    2、单文件
    3、base64流文件
    */
   private function getType(){
       $file = $this->file;
       if(is_array($file)){
           // 多文件
           if(is_array($file['name'])){
               $type = 1;
           }else{  // 单文件
               $type = 2;
           }
       }else{
           $type = 3;
       }
       $this->type = $type;
   }
   /*
    内部方法：获取图片后缀
    @param path 图片路径
    @return suffix 后缀名 如：jpg
    */
   private function getSuffix($path) {
       $file = fopen($path, "rb");
       $bin = fread($file, 2); // 只读2字节
       fclose($file);
       $strInfo = @unpack("C2chars", $bin);
       $typeCode = intval($strInfo['chars1'] . $strInfo['chars2']);
       $suffix = "unknow";
       if($typeCode == 255216){
           $suffix = "jpg";
       }elseif($typeCode == 7173){
           $suffix = "gif";
       }elseif($typeCode == 13780){
           $suffix = "png";
       }elseif($typeCode == 6677){
           $suffix = "bmp";
       }elseif($typeCode == 7798){
           $suffix = "exe";
       }elseif($typeCode == 7784){
           $suffix = "midi";
       }elseif($typeCode == 8297){
           $suffix = "rar";
       }elseif($typeCode == 7368){
           $suffix = "mp3";
       }elseif($typeCode == 0){
           $suffix = "mp4";
       }elseif($typeCode == 8273){
           $suffix = "wav";
       }
       return $suffix;
   }
   /*
    内部方法：保存流文件
    @param stream 文件流
    @param suffix 后缀
    @param dir 保存文件夹
    @return path 文件路径
    */
   private function uploadBase64($stream,$suffix,$dir) {
       if (empty($stream)) return false;
       if (preg_match('/^(data:(\s)?(image|img)\/(\w+);base64,)/', $stream, $str)) {
           $path = $dir . md5(rand(100000, 999999)) . ".{$suffix}";
           if (file_put_contents($path, base64_decode(str_replace($str[1], '', $stream)))) {
               return $path;
           } else {
               return false;
           }
       } else {
           return false;
       }
   }
   /*
    校验文件类型是否合法
    @return ret true:合法 false:非法
    */
   public function checkType(){
       $file = $this->file;
       $type = $this->type;
       $validSuffix = $this->suffix;
       $ret = true;
       if($type==1){   // 多文件
           foreach($file['tmp_name'] as $v){
               $suffix = $this->getSuffix($v);
               if(!in_array($suffix,$validSuffix)){
                   $ret = false;
                   break;
               }
           }
       }elseif($type==2){  // 单文件
           $suffix = $this->getSuffix($file['tmp_name']);
           if(!in_array($suffix,$validSuffix)){
               $ret = false;
           }
       }else{  // base64文件
           $suffix = $this->getSuffix($file);
           if(!in_array($suffix,$validSuffix)){
               $ret = false;
           }
       }
       return $ret;
   }
   /*
    校验文件尺寸是否合法
    @return ret true:合法 false:非法
    */
   public function checkMeasure(){
       $file = $this->file;
       $type = $this->type;
       $validMeasure = $this->measure;
       $ret = true;
       if($type==1){   // 多文件
           foreach($file['tmp_name'] as $v){
               $measure = getimagesize($v);
               $width = $measure[0];
               $height = $measure[1];
               if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
                   $ret = false;
                   break;
               }
           }
       }elseif($type==2){  // 单文件
           $measure = getimagesize($file['tmp_name']);
           $width = $measure[0];
           $height = $measure[1];
           if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
               $ret = false;
           }
       }else{  // base64文件
           $measure = getimagesize($file);
           $width = $measure[0];
           $height = $measure[1];
           if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
               $ret = false;
           }
       }
       return $ret;
   }
   /*
    校验文件大小是否合法
    @return ret true:合法 false:非法
    */
   public function checkSize(){
       $file = $this->file;
       $type = $this->type;
       $validSize = $this->size;
       $ret = true;
       if($type==1){   // 多文件
           foreach($file['tmp_name'] as $v){
               $size = filesize($v);
               if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
                   $ret = false;
                   break;
               }
           }
       }elseif($type==2){  // 单文件
           $size = filesize($file['tmp_name']);
           if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
               $ret = false;
           }
       }else{  // base64文件
           $info = file_get_contents($file);
           $size = strlen($info);
           if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
               $ret = false;
           }
       }
       return $ret;
   }
   /*
    @desc：获取图片信息
    */
   public function info(){
       $file = $this->file;
       $type = $this->type;
       $ret = array();
       if($type==1){   // 多文件
           foreach($file['tmp_name'] as $k=>$v){
               $measure = getimagesize($v);
               $width = $measure[0];
               $height = $measure[1];
               $size = filesize($v)/1024/1024;
               $ret[$k] = array(
                       'width'=>$width,
                       'height'=>$height,
                       'size'=>number_format($size,2)
                   );
           }
       }elseif($type==2){  // 单文件
           $measure = getimagesize($file['tmp_name']);
           $width = $measure[0];
           $height = $measure[1];
           $size = filesize($file['tmp_name'])/1024/1024;
           $ret = array(
                   'width'=>$width,
                   'height'=>$height,
                   'size'=>number_format($size,2)
               );
       }else{  // base64文件
           $measure = getimagesize($file);
           $width = $measure[0];
           $height = $measure[1];
           $info = file_get_contents($file);
           $size = strlen($info)/1024/1024;
           $ret = array(
                   'width'=>$width,
                   'height'=>$height,
                   'size'=>number_format($size,2)
               );
       }
       return $ret;
   }
   /*
    内部方法：缩放图片
    */
   private function scale($path,$suffix,$ratio){
       list($width, $height) = getimagesize($path);  
       $new_w = $ratio * $width;
       $new_h = $ratio * $height;
       $new_s = imagecreatetruecolor($new_w, $new_h);
       if(in_array($suffix,array('jpg','jpeg'))){
           $img = imagecreatefromjpeg($path);
       }elseif($suffix == 'png'){
           $img = imagecreatefrompng($path);
       }elseif($suffix == 'gif'){
           $img = imagecreatefromgif($path);
       }else{
           return false;
       }
       $ret1 = imagecopyresized($new_s, $img, 0, 0, 0, 0, $new_w, $new_h, $width, $height);  
       if(in_array($suffix,array('jpg','jpeg'))){
           $ret2 = imagejpeg($new_s, $path);
       }elseif($suffix == 'png'){
           $ret2 = imagepng($new_s, $path);
       }elseif($suffix == 'gif'){
           $ret2 = imagegif($new_s, $path);
       }else{
           return false;
       }
       imagedestroy($new_s);  
       imagedestroy($img);
       if($ret1 && $ret2){
           return $path;
       }else{
           return false;
       }
   }
   /*
    内部方法：裁剪图片
    */
   private function crop($path,$suffix,$cut_width,$cut_height){
       $cut_x;
       $cut_y;
       $min;
       $size = getimagesize($path);
       $width = $size[0];
       $height = $size[1];
       $min = min($width,$height);
       $cut_width = ($cut_width > $min)?$min:$cut_width;
       $cut_height = ($cut_height > $min)?$min:$cut_height;
       $cut_x = ($width - $cut_width) / 2;
       $cut_y = ($height - $cut_height) / 2;
       if(in_array($suffix,array('jpg','jpeg'))){
           $img = imagecreatefromjpeg($path);
       }elseif($suffix == 'png'){
           $img = imagecreatefrompng($path);
       }elseif($suffix == 'gif'){
           $img = imagecreatefromgif($path);
       }else{
           return false;
       }
       $new_s = imagecreatetruecolor($cut_width, $cut_height);
       $ret1 = imagecopyresampled($new_s, $img, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height, $cut_width, $cut_height);  
       if(in_array($suffix,array('jpg','jpeg'))){
           $ret2 = imagejpeg($new_s, $path);
       }elseif($suffix == 'png'){
           $ret2 = imagepng($new_s, $path);
       }elseif($suffix == 'gif'){
           $ret2 = imagegif($new_s, $path);
       }else{
           return false;
       }
       imagedestroy($new_s);
       imagedestroy($img);
       if($ret1 && $ret2){
           return $path;
       }else{
           return false;
       }
   }
   /*
    内部方法：生成缩略图
    */
   private function thumb($path,$suffix,$cut_width,$cut_height){
       $cut_x;
       $cut_y;
       $ratio = 1;
       $size = getimagesize($path);
       $width = $size[0];
       $height = $size[1];
       $cw;
       $ch;
       if($width/$height >= $cut_width/$cut_height){
           $ratio = $cut_height / $height;
       }else{
           $ratio = $cut_width / $width;
       }
       $path = $this->scale($path,$suffix,$ratio,$path);
       $width *= $ratio;
       $height *= $ratio;
       $cut_x = abs($cut_width - $width) / 2;
       $cut_y = abs($cut_height - $height) / 2;
       if(in_array($suffix,array('jpg','jpeg'))){
           $img = imagecreatefromjpeg($path);
       }elseif($suffix == 'png'){
           $img = imagecreatefrompng($path);
       }elseif($suffix == 'gif'){
           $img = imagecreatefromgif($path);
       }else{
           return false;
       }
       $new_s = imagecreatetruecolor($cut_width, $cut_height);
       $ret1 = imagecopyresampled($new_s, $img, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height, $cut_width, $cut_height);  
       if(in_array($suffix,array('jpg','jpeg'))){
           $ret2 = imagejpeg($new_s, $path);
       }elseif($suffix == 'png'){
           $ret2 = imagepng($new_s, $path);
       }elseif($suffix == 'gif'){
           $ret2 = imagegif($new_s, $path);
       }else{
           return false;
       }
       imagedestroy($new_s);
       imagedestroy($img);
       if($ret1 && $ret2){
           return $path;
       }else{
           return false;
       }
   }
   /*
    保存
    @param dir 存储的文件夹 如：'./'
    @return ret 存储的文件路径 如：'./test.jpg'
    */
   public function save($dir){
       $file = $this->file;
       $type = $this->type;
       $scale = $this->scale;
       $crop = $this->crop;
       $thumb = $this->thumb;
       $is_scale = $scale['is_scale'];
       $is_crop = $crop['is_crop'];
       $is_thumb = $thumb['is_thumb'];
       $ratio = $scale['ratio'];
       $crop_width = $crop['width'];
       $crop_height = $crop['height'];
       $thumb_width = $thumb['width'];
       $thumb_height = $thumb['height'];
       if($type==1){   // 多文件
           foreach($file['tmp_name'] as $k=>$v){
               $suffix = $this->getSuffix($v);
               $name = $dir.md5(rand(100000,999999)).'.'.$suffix;
               $flag = file_put_contents($name,file_get_contents($v));
               if(!$flag){
                   $ret = false;
               }else{
                   if($is_scale){
                       $name = $this->scale($name,$suffix,$ratio);
                   }
                   if($is_crop){
                       $name = $this->crop($name,$suffix,$crop_width,$crop_height);
                   }
                   if($is_thumb){
                       $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
                   }
                   $ret[$k] = $name;
               }
           }
       }elseif($type==2){  // 单文件
           $suffix = $this->getSuffix($file['tmp_name']);
           $name = $dir.md5(rand(100000,999999)).'.'.$suffix;
           $flag = file_put_contents($name,file_get_contents($file['tmp_name']));
           if(!$flag){
               $ret = false;
           }else{
               if($is_scale){
                   $name = $this->scale($name,$suffix,$ratio);
               }
               if($is_crop){
                   $name = $this->crop($name,$suffix,$crop_width,$crop_height);
               }
               if($is_thumb){
                   $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
               }
               $ret = $name;
           }
       }else{  // base64文件
           $suffix = $this->getSuffix($file);
           $name = $dir.md5(rand(100000,999999)).'.'.$suffix;
           $flag = file_put_contents($name,file_get_contents($file));
           if(!$flag){
               $ret = false;
           }else{
               if($is_scale){
                   $name = $this->scale($name,$suffix,$ratio);
               }
               if($is_crop){
                   $name = $this->crop($name,$suffix,$crop_width,$crop_height);
               }
               if($is_thumb){
                   $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
               }
               $ret = $name;
           }
       }
       return $ret;
   }
   }

2. 示例用法：

   $file = $_FILES['file'];
   $image = new image($file);
   $image->thumb = array(
       'is_thumb'=>1,
       'width'=>200,
       'height'=>500
   );
   $ret = $image->save('./');
   var_dump($ret);