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":"php;
   }
   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();

教程网址:http://www.phprm.com/frame/php1004983.html

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