时间：2021-07-01 10:21:17 帮助过：86人阅读
chk_err(-1); //无传入控件名 }else{ $this->inputName = $inputName; } if(!empty($allowType)) $this->allowType = $allowType; if(!empty($allowSize)) $this->allowSize = $allowSize; if(!empty($saveDir)) $this->saveDir = $saveDir; if(!empty($isRename)) $this->isRename = $isRename; } function is_uploaded(){ if(empty($_FILES[$this->inputName]['name'])){ $this->chk_err(4); //没有文件被上传 }else{ if(is_uploaded_file($_FILES[$this->inputName]['tmp_name'])){ return true; }else{ $this->chk_err(-2); //文件上传不合法 } } } function chk_type(){ if(!in_array($_FILES[$this->inputName]['type'],$this->allowType)){ $this->chk_err(-3); //上传的文件类型不被允许 }else{ return true; } } function chk_size(){ if($_FILES[$this->inputName]['size'] > $this->allowSize){ $this->chk_err(-4); //上传的文件过大 }else{ return true; } } function move_uploaded(){ //移动上传文件 if(!$this->is_uploaded()){ return false; } if(!$this->chk_size()){ return false; } if(!$this->chk_type()){ return false; } //重命名 if($this->isRename){ $arrTmp = pathinfo($_FILES[$this->inputName]['name']); $extension = strtolower($arrTmp['extension']); $file_newname = $this->FileName; //重命名新文件 }else{ $file_newname = $_FILES[$this->inputName]['name']; } if(!file_exists($this->saveDir)){ //判断保存目录是否存在 mkdir($this->saveDir,0777,true); //建立保存目录 } //移动文件 $result = move_uploaded_file($_FILES[$this->inputName]['tmp_name'],$this->saveDir."/".$file_newname); if($result){ $path = $this->savePath = $this->saveDir."/".$file_newname; //文件的成功保存路径 return $path; }else{ $this->chk_err($_FILES[$this->inputName]['error']); } } //判断出错信息 function chk_err($errID){ $this->errID = $errID; switch($this->errID){ case -4: $this->errMsg = '只能上传1M以内的图片 | [返回]'; break; case -3: $this->errMsg = '这不是一张图片 | [返回]'; break; case -2: $this->errMsg = '文件上传不合法 | [返回]'; break; case -1: $this->errMsg = '无控件名传入 | [返回]'; break; case 1: $this->errMsg = '上传的文件超出了php.ini中upload_max_filesize设定的最大值 | [返回]'; break; case 2: $this->errMsg = '上传文件的大小超过了HTML表单中MAX_FILE_SIZE选项指定的值 | [返回]'; break; case 3: $this->errMsg = '文件只有部分被上传 | [返回]'; break; case 4: $this->errMsg = '请选择一张图片 | [返回]'; break; default: break; } return false; } function get_errMsg(){ echo $this->errMsg; //输出错误信息 } /** +---------------------------------------------------------- * 取得图像信息 * +---------------------------------------------------------- * @static * @access public +---------------------------------------------------------- * @param string $image 图像文件名 +---------------------------------------------------------- * @return mixed +---------------------------------------------------------- */ function getImageInfo($img) { $imageInfo = getimagesize($img); if( $imageInfo!== false) { $imageType = strtolower(substr(image_type_to_extension($imageInfo[2]),1)); $imageSize = filesize($img); $info = array( "width" =>$imageInfo[0], "height" =>$imageInfo[1], "type" =>$imageType, "size" =>$imageSize, "mime" =>$imageInfo['mime'], ); return $info; }else { return false; } } /** +---------------------------------------------------------- * 生成缩略图 +---------------------------------------------------------- * @static * @access public +---------------------------------------------------------- * @param string $image 原图 * @param string $type 图像格式 * @param string $thumbname 缩略图文件名 * @param string $maxWidth 宽度 * @param string $maxHeight 高度 * @param string $position 缩略图保存目录 * @param boolean $interlace 启用隔行扫描 * @param boolean $is_save 是否保留原图 +---------------------------------------------------------- * @return void +---------------------------------------------------------- */ function thumb($image,$is_save=true,$suofang=0,$type='',$maxWidth=500,$maxHeight=500,$interlace=true){ // 获取原图信息 $info = $this->getImageInfo($image); if($info !== false) { $srcWidth = $info['width']; $srcHeight = $info['height']; $type = empty($type)?$info['type']:$type; $type = strtolower($type); $interlace = $interlace? 1:0; unset($info); if ($suofang==1) { $width = $srcWidth; $height = $srcHeight; } else { $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight); // 计算缩放比例 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); //147 $height = (int)($srcHeight*$scale); //199 } } // 载入原图 $createFun = 'ImageCreateFrom'.($type=='jpg'?'jpeg':$type); $srcImg = $createFun($image); //创建缩略图 if($type!='gif' && function_exists('imagecreatetruecolor')) $thumbImg = imagecreatetruecolor($width, $height); else $thumbImg = imagecreate($width, $height); // 复制图片 if(function_exists("ImageCopyResampled")) imagecopyresampled($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth,$srcHeight); else imagecopyresized($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth,$srcHeight); if('gif'==$type || 'png'==$type) { //imagealphablending($thumbImg, false);//取消默认的混色模式 //imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息 $background_color = imagecolorallocate($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); //$gray=ImageColorAllocate($thumbImg,255,0,0); //ImageString($thumbImg,2,5,5,"ThinkPHP",$gray); // 生成图片 $imageFun = 'imagejpeg'; $length = strlen("00.".$type) * (-1); $_type = substr($image,-4); $length = ($type != $_type ? $length+1 : $length); //裁剪 if ($suofang == 1){ //$thumbname01 = substr_replace($image,"01.".$type,$length); //大头像 $thumbname02 = substr_replace($image,'.gif',-8); //小头像 //$imageFun($thumbImg,$thumbname01,100); $imageFun($thumbImg,$thumbname02,100); //$thumbImg01 = imagecreatetruecolor(190,195); //imagecopyresampled($thumbImg01,$thumbImg,0,0,$_POST['x'],$_POST['y'],190,195,$_POST['w'],$_POST['h']); $thumbImg02 = imagecreatetruecolor($this->ImgSize,$this->ImgSize); imagecopyresampled($thumbImg02,$thumbImg,0,0,$_POST['x'],$_POST['y'],$this->ImgSize,$this->ImgSize,$_POST['w'],$_POST['h']); //$imageFun($thumbImg01,$thumbname01,100); $imageFun($thumbImg02,$thumbname02,100); unlink($image); //imagedestroy($thumbImg01); imagedestroy($thumbImg02); imagedestroy($thumbImg); imagedestroy($srcImg); return array(/*'big' => $thumbname01 ,*/ 'small' => $thumbname02); //返回包含大小头像路径的数组 }else{ if($is_save == false){ //缩略图覆盖原图，缩略图的路径还是原图路径 $imageFun($thumbImg,$image,100); }else{ $thumbname03 = $image; //缩略图与原图同时存在， $imageFun($thumbImg,$thumbname03,100); imagedestroy($thumbImg); imagedestroy($srcImg); return $thumbname03 ; //返回缩略图的路径，字符串 } } } return false; }}
上传不会改变图片，你可以把图片贴在这里
对于 GD2 缩略图都应 imagecreatetruecolor、imagecopyresampled
如果有透明色，还需 imagecolortransparent
贴出图来看一下
贴出图来看一下
贴出图来看一下
imagecreate 和 imagecreatetruecolor 产生的图片都是黑色的（注意：不是透明的）
你的图片是透明的，自然就将背景显现出来了
也就是说图片是放在黑色的背景上的了
所以被缩放的图片还需要设置透明色
$url = 'http://img.bbs.csdn.net/upload/201404/15/1397545309_839045.gif';$sm = imagecreatefromstring(file_get_contents($url));$dm = imagecreatetruecolor(imagesx($sm), imagesy($sm));//$dm = imagecreate(imagesx($sm), imagesy($sm));$c = imagecolorallocate($dm, 100, 1, 1);imagefill($dm, 0, 0, $c);imagecolortransparent($dm, $c);imagecopyresampled($dm, $sm, 0, 0, 0, 0, imagesx($dm), imagesy($dm), imagesx($sm), imagesy($sm));imagegif($dm);
我自己解决了。。还是谢谢你们，是我没有用imagefill事先填充的原因