在上传到服务器之前使用 GD 编辑图像

Question

我正在尝试在上传到服务器之前向带有边框的图像添加一些文本。但是，我编写代码的方式似乎并未上传图像。我已经分别检查了上传工作和图像处理工作，但它们一起不起作用：

$name = "some text";
$target_dir = "uploads/";
//strip filename of clear spaces 
$cleaned = str_replace(' ', '', basename($_FILES["fileToUpload"]["name"]));
$target_file = $target_dir . $cleaned;
$image = $_FILES["fileToUpload"]["name"];


$im = imagecreatefromjpeg($image);
$white = imagecolorallocate($im, 255, 255, 255);
$font_path = 'uploads/SCRIPTIN.ttf';
$text = "In Memory of " . $name;
imagesetthickness($im, 200);
$black = imagecolorallocate($im, 0, 0, 0);
$x = 0;
$y = 0;
$w = imagesx($im) - 1;
$z = imagesy($im) - 1;
imageline($im, $x, $y, $x, $y+$z, $black);
imageline($im, $x, $y, $x+$w, $y, $black);
imageline($im, $x+$w, $y, $x+$w, $y+$z, $black);
imageline($im, $x, $y+$z, $x+$w ,$y+$z, $black);
imagettftext($im, 200, 0, 20, 300, $white, $font_path, $text);

我认为这可能与我将文件写入服务器的方式有关：

move_uploaded_file(imagejpeg($im), $target_file);

Answer 1

这是一个快速的草稿，但它应该可以工作：

创建一个文件ImageProcessor.php，复制代码，并通过require_once包含它：

class ImageProcessor
{
    /** @var string actual file, in our tmp folder on the server */
    private $file;

    /** @var string filename that we are going to save it with */
    private $filename;

    /** @var string the name we are going to write on the image */
    private $name_to_write;

    /** @var resource file resource */
    private $resource = false;

    /** @var string where we are going to save the result */
    public static $save_path = 'images/';

    /** @var array the list of file extensions we're going to allow */
    private $allowed_extensions = array('jpg', 'jpeg', 'png', 'gif');

    public function __construct($file, $name_to_write)
    {
        if (!is_array($file) || !isset($file['tmp_name'])) {
            throw new Exception('We are expecting something else');
        }

        $this->file = $file['tmp_name'];
        $this->filename = $file['name'];
        $this->name_to_write = $name_to_write;

        if (!$this->checkFileValidity()) {
            throw new Exception('Invalid file');
        }
    }

    /*
     * Get the file extension in lowercase for further checks
     *
     * @return string
     */
    private function getExtension()
    {
        return strtolower(pathinfo($this->filename, PATHINFO_EXTENSION));
    }

    /*
     * Check whether the file has a valid extension.
     *
     * @return bool
     */
    private function checkFileValidity()
    {
        return in_array($this->getExtension(), $this->allowed_extensions);
    }

    /*
     * Create a resource, depending on file's extension
     *
     * @return void
     */
    private function setFileResource()
    {
        switch ($this->getExtension()) {
            case 'jpeg':
            case 'jpg':
                $this->resource = imagecreatefromjpeg($this->file);
            break;

            case 'png':
                $this->resource = imagecreatefrompng($this->file);
            break;

            case 'gif':
                $this->resource = imagecreatefromgif($this->file);
            break;
        }
    }

    /*
     * Process the file - add borders, and writings, and so on.
     * In the last step we're also saving it.
     *
     * @return void
     */
    public function processFile()
    {
        $this->setFileResource();

        if (!$this->resource) {
            throw new Exception('Invalid file');
        }

        $white = imagecolorallocate($this->resource, 255, 255, 255);
        $font_path = 'uploads/SCRIPTIN.ttf';
        $text = "In Memory of ".$this->name_to_write;

        imagesetthickness($this->resource, 200);
        $black = imagecolorallocate($this->resource, 0, 0, 0);
        $x = 0;
        $y = 0;
        $w = imagesx($im) - 1;
        $z = imagesy($im) - 1;
        imageline($this->resource, $x, $y, $x, $y+$z, $black);
        imageline($this->resource, $x, $y, $x+$w, $y, $black);
        imageline($this->resource, $x+$w, $y, $x+$w, $y+$z, $black);
        imageline($this->resource, $x, $y+$z, $x+$w ,$y+$z, $black);
        imagettftext($this->resource, 200, 0, 20, 300, $white, $font_path, $text);

        return $this->save();
    }

    /*
     * Save the file in $save_path and return the path to the file
     *
     * @return mixed string|bool
     */
    private function save()
    {
        imagejpeg($this->resource, self::$save_path.$this->filename);

        return file_exists(self::$save_path.$this->filename) ? self::$save_path.$this->filename : false;
    }
}

然后当你检测到文件已经上传时调用它：

if (isset($_FILES['fileToUpload']) && is_uploaded_file($_FILES['fileToUpload']['tmp_name'])) {
    $processor = new ImageProcessor($_FILES['fileToUpload'], 'John Doe');

    if ($image_path = $processor->processFile()) {
        var_dump($image_path); // this is your new image
    }
}

已更新（忘记在图片上写上姓名）