Question

所以我做了这个脚本，它使用PHP动态创建tumbnails并且它工作正常，但是我正在创建tumbnails的这些文件正在从用户上传。我有足够的验证来知道它正在上传哪种类型的图像。允许的一次是（ JPG PNG GIF ）我之前没有创建此脚本。

if (pathinfo($fileName,PATHINFO_EXTENSION) == 'png'){
                $img = imagecreatefrompng($basePath.'/'.$fileName);
                $width = imagesx($img);
                $height = imagesx($img);

                //Calculateing tumbnails size
                $newWidth = 100;
                $newHeight = floor($height*(100/$width));

                //Create a new tempoary image
                $tmpImage = imagecreatetruecolor($newWidth,$newHeight);

                imagecopyresized($tmpImage,$img,0,0,0,0,$newWidth,$newHeight,$width,$height);

                imagepng($tmpImage,$pathToTumb.'/'.$fileName);
            }
            if (pathinfo($fileName,PATHINFO_EXTENSION) == 'jpg'){
                $img = imagecreatefromjpeg($basePath.'/'.$fileName);
                $width = imagesx($img);
                $height = imagesx($img);

                //Calculateing tumbnails size
                $newWidth = 100;
                $newHeight = floor($height*(100/$width));

                //Create a new tempoary image
                $tmpImage = imagecreatetruecolor($newWidth,$newHeight);

                imagecopyresized($tmpImage,$img,0,0,0,0,$newWidth,$newHeight,$width,$height);

                imagejpeg($tmpImage,$pathToTumb.'/'.$fileName);
            }
            if(pathinfo($fileName,PATHINFO_EXTENSION) == 'gif'){
                $img = imagecreatefromgif($basePath.'/'.$fileName);
                $width = imagesx($img);
                $height = imagesx($img);

                //Calculateing tumbnails size
                $newWidth = 100;
                $newHeight = floor($height*(100/$width));

                //Create a new tempoary image
                $tmpImage = imagecreatetruecolor($newWidth,$newHeight);

                imagecopyresized($tmpImage,$img,0,0,0,0,$newWidth,$newHeight,$width,$height);

                imagegif($tmpImage,$pathToTumb.'/'.$fileName);
            }

我发现非常重复的是有不同的方法为不同的格式做这个吗？

如果图像没有扩展名，如果文件名只是test而不是test.jpg

，我甚至想要这样做。

Answer 1

如果您发现自己复制并粘贴代码，则应将该代码转换为函数。您的代码可以重构如下：

switch (pathinfo($fileName, PATHINFO_EXTENSION)) {
    case 'png':
        $tmpImage = thumb(imagecreatefrompng($basePath.'/'.$fileName));
        imagepng($tmpImage,$pathToTumb.'/'.$fileName);
        break;
    case 'jpg':
        $tmpImage = thumb(imagecreatefromjpeg($basePath.'/'.$fileName));
        imagejpeg($tmpImage,$pathToTumb.'/'.$fileName);
        break;
    case 'gif':
        $tmpImage = thumb(imagecreatefromgif($basePath.'/'.$fileName));
        imagegif($tmpImage,$pathToTumb.'/'.$fileName);
        break;
}

function thumb($img) {
    $width = imagesx($img);
    $height = imagesx($img);

    //Calculateing tumbnails size
    $newWidth = 100;
    $newHeight = floor($height*(100/$width));

    //Create a new tempoary image
    $tmpImage = imagecreatetruecolor($newWidth,$newHeight);

    imagecopyresized($tmpImage,$img,0,0,0,0,$newWidth,$newHeight,$width,$height);

    return $tmpImage;
}

要检测没有文件扩展名的图片类型，您可以使用exif_imagetype()，或者如果您的主机上没有，则使用getimagesize()。

使用PHP为不同格式创建缩略图

1 个答案: