php 上传文件并生成缩略图代码

if( isset($_FILES['upImg']) )
{
 if( $userGroup[$loginArr['group']]['upload'] == 0 )
 {
  echo '{"error":"您所在的用户组无权上传图片!"}';
 }
 else
 {
  $savePath = "attachment/img/".date('Y/m/d/H');

  mkDirs($savePath);

  $fileType = strtolower(strrchr($_FILES['upImg']['name'],"."));

  if ( !in_array($fileType, array(".jpg",".jpeg",".gif",".png")) )
  {
   echo '{"error":"目前仅支持格式为jpg、jpeg、gif、png的图片!"}';
  }
  elseif( $_FILES['upImg']['size'] > 204800 )
  {
   echo '{"error":"图片不能超过200K!"}';
  }
  else
  {
   $saveImg = $savePath."/".$loginArr['uid']."_".time().rand().$fileType;

   if( @move_uploaded_file($_FILES['upImg']['tmp_name'], $saveImg) )
   {
    echo '{"error":"","msg":"http://'.$site_domain.$site_catalog.$saveImg.'"}';
   }
   else
   {
    echo '{"error":"图片上传失败!"}';
   }
  }
 }
}

if( $loginArr['state'] == 0 )
{
 echo '{"error":"您还没有登录!"}';
}
else
{
 $avatarPath = "attachment/avatar/".($loginArr['uid']%32)."/".($loginArr['uid']%257)."/".$loginArr['uid'];

 if( isset($_FILES['upAvatar']) )
 {
  mkDirs($avatarPath);

  $fileType = strtolower(strrchr($_FILES['upAvatar']['name'],"."));

  if ( !in_array($fileType, array(".jpg",".jpeg",".gif",".png")) )
  {
   echo '{"error":"目前仅支持格式为jpg、jpeg、gif、png的图片!"}';
  }
  elseif( $_FILES['upAvatar']['size'] > 2097152 )
  {
   echo '{"error":"图片不能超过2MB!"}';
  }
  else
  {
   $imgInfo = @getimagesize($_FILES['upAvatar']['tmp_name']);

   if( !$imgInfo || !in_array($imgInfo[2], array(1,2,3)) )
   {
    echo '{"error":"系统无法识别您上传的文件!"}';
   }
   else
   {
    $TmpAvatar = $avatarPath."/temp".$fileType;
    
    if( @move_uploaded_file($_FILES['upAvatar']['tmp_name'], $TmpAvatar) )
    {
     $maxWidth = 520;

     $maxHeight = 520;

     if( $maxWidth > $imgInfo[0] || $maxHeight > $imgInfo[1] )
     {
      $maxWidth = $imgInfo[0];

      $maxHeight = $imgInfo[1];
     }
     else
     {
      if ( $imgInfo[0] < $imgInfo[1] )
       $maxWidth = ($maxHeight / $imgInfo[1]) * $imgInfo[0];
      else
       $maxHeight = ($maxWidth / $imgInfo[0]) * $imgInfo[1];
     }

     if( $maxWidth < 40 )
     {
      $maxWidth = 40;
     }

     if( $maxHeight < 40 )
     {
      $maxHeight = 40;
     }

     $image_p = imagecreatetruecolor($maxWidth, $maxHeight);

     switch($imgInfo[2])
     {
      case 1:
       $image = imagecreatefromgif($TmpAvatar);
       break;
      case 2:
       $image = imagecreatefromjpeg($TmpAvatar);
       break;
      case 3:
       $image = imagecreatefrompng($TmpAvatar);
       break;
     }

     imagecopyresampled($image_p, $image, 0, 0, 0, 0, $maxWidth, $maxHeight, $imgInfo[0], $imgInfo[1]);

     imagejpeg($image_p, $avatarPath."/temp.jpg",100);

     imagedestroy($image_p);

     imagedestroy($image);

     if( $fileType != ".jpg" && file_exists($TmpAvatar) )
     {
      unlink($TmpAvatar);
     }

     echo '{"error":"","url":"'.$avatarPath.'/temp.jpg?'.rand().'","width":"'.$maxWidth.'","height":"'.$maxHeight.'"}';
    }
    else
    {
     echo '{"error":"图片上传失败!"}';
    }
   }
  }
 }

 if( isset($_POST['x'],$_POST['y'],$_POST['w'],$_POST['h']) )
 {
  if( is_numeric($_POST['x']) && is_numeric($_POST['y']) && $_POST['w'] > 0 && $_POST['h'] > 0 )
  {
   $image_p = imagecreatetruecolor(40, 40);

   $image = imagecreatefromjpeg($avatarPath."/temp.jpg");

   imagecopyresampled($image_p, $image, 0, 0, $_POST['x'], $_POST['y'], 40, 40, $_POST['w'], $_POST['h']);

   imagejpeg($image_p, $avatarPath."/40_40.jpg",100);

   imagedestroy($image_p);

   imagedestroy($image);

   unlink($avatarPath."/temp.jpg");

   echo "1";
  }
 }

 if( isset($_POST['avatar']) && $_POST['avatar'] == "delete" )
 {
  if( file_exists($avatarPath."/temp.jpg") )
  {
   unlink($avatarPath."/temp.jpg");
  }
 }
}

ob_end_flush();