将图片保存为不同规格的图片的php代码

/**
图片处理类
 */
class imagecls
{
 /**
  * 文件信息
  */
 var $file = array();
 /**
  * 保存目录
  */
 var $dir = '';
 /**
  * 错误代码
  */
 var $error_code = 0;
 /**
  * 文件上传最大KB
  */
 var $max_size = -1;
 function es_imagecls()
 {
 }

    private function checkSize($size)
    {
        return !($size > $this->max_size) || (-1 == $this->max_size);
    }

 /**
  * 处理上传文件
  * @param array $file 上传的文件
  * @param string $dir 保存的目录
  * @return bool
  */
 function init($file, $dir = 'temp')
 {
     if(!is_array($file) || empty($file) || !$this->isUploadFile($file['tmp_name']) || trim($file['name']) == '' || $file['size'] == 0)
     {
  $this->file = array();
  $this->error_code = -1;
  return false;
     }
     else
  {
    $file['size'] = intval($file['size']);
    $file['name'] =  trim($file['name']);
    $file['thumb'] = '';
    $file['ext'] = $this->fileExt($file['name']);
    $file['name'] =  htmlspecialchars($file['name'], ENT_QUOTES);
    $file['is_image'] = $this->isImageExt($file['ext']);
    $file['file_dir'] = $this->getTargetDir($dir);
    $file['prefix'] = md5(microtime(true)).rand(10,99);
    $file['target'] = "./public/".$file['file_dir'].'/'.$file['prefix'].'.jpg';  //相对
    $file['local_target'] = APP_ROOT_PATH."public/".$file['file_dir'].'/'.$file['prefix'].'.jpg';//物理
    $this->file = &$file;
    $this->error_code = 0;
    return true;
  }
}
/**
* 保存文件
* @return bool
*/
function save()
{
  if(empty($this->file) || empty($this->file['tmp_name']))
   $this->error_code = -101;
  elseif(!$this->checkSize($this->file['size']))
   $this->error_code = -105;
  elseif(!$this->file['is_image'])
   $this->error_code = -102;
  elseif(!$this->saveFile($this->file['tmp_name'], $this->file['local_target']))
   $this->error_code = -103;
                  elseif($this->file['is_image'] &&
          (!$this->file['image_info'] = $this->getImageInfo($this->file['local_target'], true)))
  {
   $this->error_code = -104;
   @unlink($this->file['local_target']);
  }
  else
  {
   $this->error_code = 0;
   return true;
  }
  return false;
 }
 /**
  * 获取错误代码
  * @return number
  */
 function error()
 {
  return $this->error_code;
 }
 /**
  * 获取文件扩展名
  * @return string
  */
 function fileExt($file_name)
 {
  return addslashes(strtolower(substr(strrchr($file_name, '.'), 1, 10)));
 }
 /**
  * 根据扩展名判断文件是否为图像
  * @param string $ext 扩展名
  * @return bool
  */
 function isImageExt($ext)
 {
  static $img_ext  = array('jpg', 'jpeg', 'png', 'bmp','gif','giff');
  return in_array($ext, $img_ext) ? 1 : 0;
 }
 /**
  * 获取图像信息
  * @param string $target 文件路径
  * @return mixed
  */
 function getImageInfo($target)
 {
  $ext = es_imagecls::fileExt($target);
  $is_image = es_imagecls::isImageExt($ext);
  if(!$is_image)
   return false;
  elseif(!is_readable($target))
   return false;
  elseif($image_info = @getimagesize($target))
  {
   list($width, $height, $type) = !empty($image_info) ? $image_info :
                           array('', '', '');
   $size = $width * $height;
   if($is_image && !in_array($type, array(1,2,3,6,13)))
    return false;
   $image_info['type'] =
                       strtolower (substr(image_type_to_extension($image_info[2]),1));
   return $image_info;
  }
  else
   return false;
 }
 /**
  * 获取是否充许上传文件
  * @param string $source 文件路径
  * @return bool
  */
 function isUploadFile($source)
 {
  return $source && ($source != 'none') &&
          (is_uploaded_file($source) || is_uploaded_file(str_replace('\\', '\', $source)));
 }
 /**
  * 获取保存的路径
  * @param string $dir 指定的保存目录
  * @return string
  */
 function getTargetDir($dir)
 {
        if (!is_dir(APP_ROOT_PATH."public/".$dir)) {
             @mkdir(APP_ROOT_PATH."public/".$dir);
             @chmod(APP_ROOT_PATH."public/".$dir, 0777);
        }
        return $dir;
 }
 /**
  * 保存文件
  * @param string $source 源文件路径
  * @param string $target 目录文件路径
  * @return bool
  */
 private function saveFile($source, $target)
 {
  if(!es_imagecls::isUploadFile($source))
   $succeed = false;
  elseif(@copy($source, $target))
   $succeed = true;
  elseif(function_exists('move_uploaded_file') &&
                     @move_uploaded_file($source, $target))
   $succeed = true;
  elseif (@is_readable($source) &&
                   (@$fp_s = fopen($source, 'rb')) && (@$fp_t = fopen($target, 'wb')))
  {
   while (!feof($fp_s))
   {
    $s = @fread($fp_s, 1024 * 512);
    @fwrite($fp_t, $s);
   }
   fclose($fp_s);
   fclose($fp_t);
   $succeed = true;
  }
  if($succeed)
  {
   $this->error_code = 0;
   @chmod($target, 0644);
   @unlink($source);
  }
  else
  {
   $this->error_code = 0;
  }
  return $succeed;
 }
 public function thumb($image,$maxWidth=200,$maxHeight=50,$gen = 0,
          $interlace=true,$filepath = '',$is_preview = true)
    {
        $info  = es_imagecls::getImageInfo($image);
        if($info !== false)
  {
            $srcWidth  = $info[0];
            $srcHeight = $info[1];
   $type = $info['type'];
            $interlace  =  $interlace? 1:0;
            unset($info);
   if($maxWidth > 0 && $maxHeight > 0)
   $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight);
                                // 计算缩放比例
   elseif($maxWidth == 0)
    $scale = $maxHeight/$srcHeight;
   elseif($maxHeight == 0)
    $scale = $maxWidth/$srcWidth;

   $paths = pathinfo($image);
   $paths['filename'] = trim(strtolower($paths['basename']),
                            ".".strtolower($paths['extension']));
   $basefilename = explode("_",$paths['filename']);
   $basefilename = $basefilename[0];
   if(empty($filepath))
   {
    if($is_preview)
    $thumbname = $paths['dirname'].'/'.$basefilename.
                                     '_'.$maxWidth.'x'.$maxHeight.'.jpg';
    else
    $thumbname = $paths['dirname'].'/'.$basefilename.
                                     'o_'.$maxWidth.'x'.$maxHeight.'.jpg';
   }
   else
    $thumbname = $filepath;
   $thumburl = str_replace(APP_ROOT_PATH,'./',$thumbname);

            if($scale >= 1)
   {
                // 超过原图大小不再缩略
                $width   =  $srcWidth;
                $height  =  $srcHeight;
                if(!$is_preview)
                {
                 //非预览模式写入原图
                 file_put_contents($thumbname,file_get_contents($image));    //用原图写入
                 return array('url'=>$thumburl,'path'=>$thumbname);
                }
            }
   else
   {
                // 缩略图尺寸
                $width  = (int)($srcWidth*$scale);
                $height = (int)($srcHeight*$scale);
            }

   if($gen == 1)
   {
    $width = $maxWidth;
    $height = $maxHeight;
   }
            // 载入原图
            $createFun = 'imagecreatefrom'.($type=='jpg'?'jpeg':$type);
   if(!function_exists($createFun))
    $createFun = 'imagecreatefromjpeg';
            $srcImg = $createFun($image);
            //创建缩略图
            if($type!='gif' && function_exists('imagecreatetruecolor'))
                $thumbImg = imagecreatetruecolor($width, $height);
            else
                $thumbImg = imagecreate($width, $height);
   $x = 0;
   $y = 0;
   if($gen == 1 && $maxWidth > 0 && $maxHeight > 0)
   {
    $resize_ratio = $maxWidth/$maxHeight;
    $src_ratio = $srcWidth/$srcHeight;
    if($src_ratio >= $resize_ratio)
    {
    $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2;
    $width = ($height * $srcWidth) / $srcHeight;
    }
    else
    {
    $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2;
    $height = ($width * $srcHeight) / $srcWidth;
    }
   }
            // 复制图片
            if(function_exists("imagecopyresampled"))
                imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
               $srcWidth,$srcHeight);
            else
                imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
             $srcWidth,$srcHeight);
            if('gif'==$type || 'png'==$type) {
                $background_color  =  imagecolorallocate($thumbImg,  0,255,0);  //  指派一个绿色
    imagecolortransparent($thumbImg,$background_color);
                             //  设置为透明色，若注释掉该行则输出绿色的图
            }
            // 对jpeg图形设置隔行扫描
            if('jpg'==$type || 'jpeg'==$type)
    imageinterlace($thumbImg,$interlace);
            // 生成图片
            imagejpeg($thumbImg,$thumbname,100);
            imagedestroy($thumbImg);
            imagedestroy($srcImg);
   return array('url'=>$thumburl,'path'=>$thumbname);
         }
         return false;
    }
 public function make_thumb($srcImg,$srcWidth,$srcHeight,$type,$maxWidth=200,
         $maxHeight=50,$gen = 0)
    {
            $interlace  =  $interlace? 1:0;
   if($maxWidth > 0 && $maxHeight > 0)
    $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight);
                                       // 计算缩放比例
   elseif($maxWidth == 0)
    $scale = $maxHeight/$srcHeight;
   elseif($maxHeight == 0)
    $scale = $maxWidth/$srcWidth;
            if($scale >= 1)
   {
                // 超过原图大小不再缩略
                $width   =  $srcWidth;
                $height  =  $srcHeight;
            }
   else
   {
                // 缩略图尺寸
                $width  = (int)($srcWidth*$scale);
                $height = (int)($srcHeight*$scale);
            }
   if($gen == 1)
   {
    $width = $maxWidth;
    $height = $maxHeight;
   }

            //创建缩略图
            if($type!='gif' && function_exists('imagecreatetruecolor'))
                $thumbImg = imagecreatetruecolor($width, $height);
            else
                $thumbImg = imagecreatetruecolor($width, $height);
   $x = 0;
   $y = 0;
   if($gen == 1 && $maxWidth > 0 && $maxHeight > 0)
   {
    $resize_ratio = $maxWidth/$maxHeight;
    $src_ratio = $srcWidth/$srcHeight;
    if($src_ratio >= $resize_ratio)
    {
    $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2;
    $width = ($height * $srcWidth) / $srcHeight;
    }
    else
    {
    $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2;
    $height = ($width * $srcHeight) / $srcWidth;
    }
   }
            // 复制图片
            if(function_exists("imagecopyresampled"))
                imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
                    $srcWidth,$srcHeight);
            else
                imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
                  $srcWidth,$srcHeight);
            if('gif'==$type || 'png'==$type) {
                $background_color  =  imagecolorallocate($thumbImg,  255,255,255);
                //  指派一个绿色
  imagecolortransparent($thumbImg,$background_color);
              //  设置为透明色，若注释掉该行则输出绿色的图
            }
            // 对jpeg图形设置隔行扫描
            if('jpg'==$type || 'jpeg'==$type)
    imageinterlace($thumbImg,$interlace);
           return $thumbImg;

    }

 public function water($source,$water,$alpha=80,$position="0")
    {
        //检查文件是否存在
        if(!file_exists($source)||!file_exists($water))
            return false;
        //图片信息
        $sInfo = es_imagecls::getImageInfo($source);
        $wInfo = es_imagecls::getImageInfo($water);
        //如果图片小于水印图片，不生成图片
        if($sInfo["0"]             return false;


        if(is_animated_gif($source))
        {
         require_once APP_ROOT_PATH."system/utils/gif_encoder.php";
   require_once APP_ROOT_PATH."system/utils/gif_reader.php";
   $gif = new GIFReader();
   $gif->load($source);
   foreach($gif->IMGS['frames'] as $k=>$img)
   {
    $im = imagecreatefromstring($gif->getgif($k));
    //为im加水印
    $sImage=$im;
          $wCreateFun="imagecreatefrom".$wInfo['type'];
    if(!function_exists($wCreateFun))
     $wCreateFun = 'imagecreatefromjpeg';
          $wImage=$wCreateFun($water);

          //设定图像的混色模式
          imagealphablending($wImage, true);
          switch (intval($position))
          {
           case 0: break;
           //左上
           case 1:
            $posY=0;
            $posX=0;
            //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
            break;
           //右上
           case 2:
            $posY=0;
            $posX=$sInfo[0]-$wInfo[0];
            //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
            break;
           //左下
           case 3:
            $posY=$sInfo[1]-$wInfo[1];
            $posX=0;
            //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
            break;
           //右下
           case 4:
            $posY=$sInfo[1]-$wInfo[1];
            $posX=$sInfo[0]-$wInfo[0];
            //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
            break;
           //居中
           case 5:
            $posY=$sInfo[1]/2-$wInfo[1]/2;
            $posX=$sInfo[0]/2-$wInfo[0]/2;
            //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
            break;
          }
    //end im加水印


    ob_start();
    imagegif($sImage);
    $content = ob_get_contents();
          ob_end_clean();
    $frames [ ] = $content;
       $framed [ ] = $img['frameDelay'];
   }


   $gif_maker = new GIFEncoder (
          $frames,
          $framed,
          0,
          2,
          0, 0, 0,
          "bin"   //bin为二进制   url为地址
     );
   $image_rs = $gif_maker->GetAnimation ( );

   //如果没有给出保存文件名，默认为原图像名
         @unlink($source);
         //保存图像
         file_put_contents($source,$image_rs);
         return true;
        }

        //建立图像
  $sCreateFun="imagecreatefrom".$sInfo['type'];
  if(!function_exists($sCreateFun))
   $sCreateFun = 'imagecreatefromjpeg';
  $sImage=$sCreateFun($source);
        $wCreateFun="imagecreatefrom".$wInfo['type'];
  if(!function_exists($wCreateFun))
   $wCreateFun = 'imagecreatefromjpeg';
        $wImage=$wCreateFun($water);
        //设定图像的混色模式
        imagealphablending($wImage, true);
        switch (intval($position))
        {
         case 0: break;
         //左上
         case 1:
          $posY=0;
          $posX=0;
          //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
          break;
         //右上
         case 2:
          $posY=0;
          $posX=$sInfo[0]-$wInfo[0];
          //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
          break;
         //左下
         case 3:
          $posY=$sInfo[1]-$wInfo[1];
          $posX=0;
          //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
          break;
         //右下
         case 4:
          $posY=$sInfo[1]-$wInfo[1];
          $posX=$sInfo[0]-$wInfo[0];
          //生成混合图像
 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
          break;
         //居中
         case 5:
          $posY=$sInfo[1]/2-$wInfo[1]/2;
          $posX=$sInfo[0]/2-$wInfo[0]/2;
          //生成混合图像
  imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
          break;
        }
        //如果没有给出保存文件名，默认为原图像名
        @unlink($source);
        //保存图像
        imagejpeg($sImage,$source,100);
        imagedestroy($sImage);
    }
}
if(!function_exists('image_type_to_extension'))
{
 function image_type_to_extension($imagetype)
 {
  if(empty($imagetype))
   return false;
  switch($imagetype)
  {
   case IMAGETYPE_GIF    : return '.gif';
   case IMAGETYPE_JPEG   : return '.jpeg';
   case IMAGETYPE_PNG    : return '.png';
   case IMAGETYPE_SWF    : return '.swf';
   case IMAGETYPE_PSD    : return '.psd';
   case IMAGETYPE_BMP    : return '.bmp';
   case IMAGETYPE_TIFF_II : return '.tiff';
   case IMAGETYPE_TIFF_MM : return '.tiff';
   case IMAGETYPE_JPC    : return '.jpc';
   case IMAGETYPE_JP2    : return '.jp2';
   case IMAGETYPE_JPX    : return '.jpf';
   case IMAGETYPE_JB2    : return '.jb2';
   case IMAGETYPE_SWC    : return '.swc';
   case IMAGETYPE_IFF    : return '.aiff';
   case IMAGETYPE_WBMP   : return '.wbmp';
   case IMAGETYPE_XBM    : return '.xbm';
   default               : return false;
  }
 }
}
?>

2.get_spec_img()调用图片类,然后再用下面的方法保存不同规格的图片并返回图片连接

//获取相应规格的图片地址
//gen=0:保持比例缩放，不剪裁,如高为0，则保证宽度按比例缩放  gen=1：保证长宽，剪裁
function get_spec_image($img_path,$width=0,$height=0,$gen=0,$is_preview=true)
{
 if($width==0)
  $new_path = $img_path;
 else
 {
  $img_name = substr($img_path,0,-4);
  $img_ext = substr($img_path,-3);
  if($is_preview)
  $new_path = $img_name."_".$width."x".$height.".jpg";
  else
  $new_path = $img_name."o_".$width."x".$height.".jpg";
  if(!file_exists($new_path))
  {
   require_once "imagecls.php";
   $imagec = new imagecls();
   $thumb = $imagec->thumb($img_path,$width,$height,$gen,true,"
                           ",$is_preview);

   if(app_conf("PUBLIC_DOMAIN_ROOT")!='')
         {
          $paths = pathinfo($new_path);
          $path = str_replace("./","",$paths['dirname']);
          $filename = $paths['basename'];
          $pathwithoupublic = str_replace("public/","",$path);

                        $file_data = @file_get_contents($path.$file);
　 　                   $img = @imagecreatefromstring($file_data);
　 　                   if($img!==false)
　 　                   {
　 　  　                  $save_path = "public/".$path;
　 　  　                  if(!is_dir($save_path))
　 　  　                  {
　 　  　  　                   @mk_dir($save_path);
　 　  　                  }
　 　  　                  @file_put_contents($save_path.$name,$file_data);
　 　                   }
         }

  }
 }
 return $new_path;
}

3.使用方法:

//im:将店铺图片保存为3种规格:小图:48x48,中图120x120,大图200x200
$small_url=get_spec_image($data['image'],48,48,0);
$
middle_url
$big_url=get_spec_image($data['image'],200,200,0);