Php 上载时调整多个图像的大小不起作用

当我尝试调整正在上载的临时文件的大小时，我遇到了几个问题

我正在使用以下ResizeImage.php类：

class ResizeImage {
    // *** Class variables
    private $image;
    private $width;
    private $height;
    private $imageResized;

    function __construct($fileName)
    {
        // *** Open up the file
        $this->image = $this->openImage($fileName);

        // *** Get width and height
        $this->width  = imagesx($this->image);
        $this->height = imagesy($this->image);
    }

    ## --------------------------------------------------------

    private function openImage($file)
    {
        // *** Get extension
        $extension = strtolower(strrchr($file, '.'));

        switch($extension)
        {
            case '.jpg':
            case '.jpeg':
                $img = @imagecreatefromjpeg($file);
                break;
            case '.gif':
                $img = @imagecreatefromgif($file);
                break;
            case '.png':
                $img = @imagecreatefrompng($file);
                break;
            default:
                $img = false;
                break;
        }
        return $img;
    }

    ## --------------------------------------------------------

    public function processImage($newWidth, $newHeight, $option="auto")
    {
        // *** Get optimal width and height - based on $option
        $optionArray = $this->getDimensions($newWidth, $newHeight, $option);

        $optimalWidth  = $optionArray['optimalWidth'];
        $optimalHeight = $optionArray['optimalHeight'];


        // *** Resample - create image canvas of x, y size
        $this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
        imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);


        // *** if option is 'crop', then crop too
        if ($option == 'crop') {
            $this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
        }
    }

    ## --------------------------------------------------------

    private function getDimensions($newWidth, $newHeight, $option)
    {

       switch ($option)
        {
            case 'exact':
                $optimalWidth = $newWidth;
                $optimalHeight= $newHeight;
                break;
            case 'portrait':
                $optimalWidth = $this->getSizeByFixedHeight($newHeight);
                $optimalHeight= $newHeight;
                break;
            case 'landscape':
                $optimalWidth = $newWidth;
                $optimalHeight= $this->getSizeByFixedWidth($newWidth);
                break;
            case 'auto':
                $optionArray = $this->getSizeByAuto($newWidth, $newHeight);
                $optimalWidth = $optionArray['optimalWidth'];
                $optimalHeight = $optionArray['optimalHeight'];
                break;
            case 'crop':
                $optionArray = $this->getOptimalCrop($newWidth, $newHeight);
                $optimalWidth = $optionArray['optimalWidth'];
                $optimalHeight = $optionArray['optimalHeight'];
                break;
        }
        return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
    }

    ## --------------------------------------------------------

    private function getSizeByFixedHeight($newHeight)
    {
        $ratio = $this->width / $this->height;
        $newWidth = $newHeight * $ratio;
        return $newWidth;
    }

    private function getSizeByFixedWidth($newWidth)
    {
        $ratio = $this->height / $this->width;
        $newHeight = $newWidth * $ratio;
        return $newHeight;
    }

    private function getSizeByAuto($newWidth, $newHeight)
    {
        if ($this->height < $this->width)
        // *** Image to be resized is wider (landscape)
        {
            $optimalWidth = $newWidth;
            $optimalHeight= $this->getSizeByFixedWidth($newWidth);
        }
        elseif ($this->height > $this->width)
        // *** Image to be resized is taller (portrait)
        {
            $optimalWidth = $this->getSizeByFixedHeight($newHeight);
            $optimalHeight= $newHeight;
        }
        else
        // *** Image to be resizerd is a square
        {
            if ($newHeight < $newWidth) {
                $optimalWidth = $newWidth;
                $optimalHeight= $this->getSizeByFixedWidth($newWidth);
            } else if ($newHeight > $newWidth) {
                $optimalWidth = $this->getSizeByFixedHeight($newHeight);
                $optimalHeight= $newHeight;
            } else {
                // *** Sqaure being resized to a square
                $optimalWidth = $newWidth;
                $optimalHeight= $newHeight;
            }
        }

        return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
    }

    ## --------------------------------------------------------

    private function getOptimalCrop($newWidth, $newHeight)
    {

        $heightRatio = $this->height / $newHeight;
        $widthRatio  = $this->width /  $newWidth;

        if ($heightRatio < $widthRatio) {
            $optimalRatio = $heightRatio;
        } else {
            $optimalRatio = $widthRatio;
        }

        $optimalHeight = $this->height / $optimalRatio;
        $optimalWidth  = $this->width  / $optimalRatio;

        return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
    }

    ## --------------------------------------------------------

    private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)
    {
        // *** Find center - this will be used for the crop
        $cropStartX = ( $optimalWidth / 2) - ( $newWidth /2 );
        $cropStartY = ( $optimalHeight/ 2) - ( $newHeight/2 );

        $crop = $this->imageResized;
        //imagedestroy($this->imageResized);

        // *** Now crop from center to exact requested size
        $this->imageResized = imagecreatetruecolor($newWidth , $newHeight);
        imagecopyresampled($this->imageResized, $crop , 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight , $newWidth, $newHeight);
    }

    ## --------------------------------------------------------

    public function saveImage($savePath, $imageQuality="100")
    {
        // *** Get extension
        $extension = strrchr($savePath, '.');
           $extension = strtolower($extension);

        switch($extension)
        {
            case '.jpg':
            case '.jpeg':
                if (imagetypes() & IMG_JPG) {
                    imagejpeg($this->imageResized, $savePath, $imageQuality);
                }
                break;

            case '.gif':
                if (imagetypes() & IMG_GIF) {
                    imagegif($this->imageResized, $savePath);
                }
                break;

            case '.png':
                // *** Scale quality from 0-100 to 0-9
                $scaleQuality = round(($imageQuality/100) * 9);

                // *** Invert quality setting as 0 is best, not 9
                $invertScaleQuality = 9 - $scaleQuality;

                if (imagetypes() & IMG_PNG) {
                     imagepng($this->imageResized, $savePath, $invertScaleQuality);
                }
                break;

            // ... etc

            default:
                // *** No extension - No save.
                break;
        }

        imagedestroy($this->imageResized);
    }


    ## --------------------------------------------------------

}

---

查看找到的帖子后，非常感谢您的帮助

我意识到openImage（）方法希望提供的文件具有扩展名。 因为临时文件没有扩展名，所以对我来说，一个快速而肮脏的技巧就是读取临时文件的内容并从字符串创建图像

openImage（）函数现在如下所示：

$counter = count($_FILES['file']['name']);
if($counter > 0){

    for($i=0; $i<$counter; $i++) {

        $tmpFilePath = $_FILES['file']['tmp_name'][$i];

        if($tmpFilePath != ""){

            $filePath = $path1.$path2.'/'.$path3.'/'.time().$i.'.jpg';

            $resizeObj = new ResizeImage($tmpFilePath);
            $resizeObj -> processImage(2000, 2000, 'auto');
            $resizeObj -> saveImage($filePath, 100);
        }
    }
}

private function openImage($file) {
    $image = file_get_contents($file);
    $img = imagecreatefromstring($image);
    $return $img;
}

因为我只处理jpeg文件，这对我来说没问题。

---

我想可以对temp文件类型进行额外的测试，以覆盖其余部分。

在检查找到的post@deg之后

我意识到openImage（）方法希望提供的文件具有扩展名。 因为临时文件没有扩展名，所以对我来说，一个快速而肮脏的技巧就是读取临时文件的内容并从字符串创建图像

openImage（）函数现在如下所示：

$counter = count($_FILES['file']['name']);
if($counter > 0){

    for($i=0; $i<$counter; $i++) {

        $tmpFilePath = $_FILES['file']['tmp_name'][$i];

        if($tmpFilePath != ""){

            $filePath = $path1.$path2.'/'.$path3.'/'.time().$i.'.jpg';

            $resizeObj = new ResizeImage($tmpFilePath);
            $resizeObj -> processImage(2000, 2000, 'auto');
            $resizeObj -> saveImage($filePath, 100);
        }
    }
}

private function openImage($file) {
    $image = file_get_contents($file);
    $img = imagecreatefromstring($image);
    $return $img;
}

因为我只处理jpeg文件，这对我来说没问题。

---

我想可以对temp文件类型进行额外的测试，以覆盖其余部分。

您可以在imagecreate函数之前删除@，看看它们为什么会失败@是的，它确实帮了很多忙。我刚刚意识到临时文件没有扩展名，所以类构造函数调用了openImage（）方法，该方法正在测试文件的扩展名。下面我将解释我是如何修复它的，这就是我所指的细节。到处都是echo和print\r是你的朋友。我不久前写了一些东西，可能会帮助你在imagecreate函数之前删除@，看看它们为什么失败@是的，它确实帮了很多忙。我刚刚意识到临时文件没有扩展名，所以类构造函数调用了openImage（）方法，该方法正在测试文件的扩展名。下面我将解释我是如何修复它的，这就是我所指的细节。到处都是你的朋友。不久前我写了一些东西，可能会对你有所帮助