摘要：做了一個(gè)圖片上傳處理類，功能有圖片的拉伸縮小以及加入水印。時(shí)間有點(diǎn)倉(cāng)促整理花費(fèi)了好多時(shí)間，各位大俠如果覺得還可以點(diǎn)個(gè)贊唄。不多說，直接上代碼，注釋不清晰的大俠們可以直接查的文檔。

做了一個(gè)圖片上傳處理類，功能有圖片的拉伸,縮小以及加入水印。時(shí)間有點(diǎn)倉(cāng)促,整理花費(fèi)了好多時(shí)間，各位大俠如果覺得還可以點(diǎn)個(gè)贊唄。不多說，直接上代碼，注釋不清晰的大俠們可以直接查PHP的文檔。

原圖

縮小圖

放大圖

    
    




    上傳文件:
    
    

PHP代碼如下

 123.jpeg [type] => image/jpeg
        //[tmp_name] => /Applications/XAMPP/xamppfiles/temp/phpdsYVOn [error] => 0 [size] => 2890
        $file = $_FILES["upfile"];
        if ($this->max_file_size < $file["size"]) {
            return "文件太大!";
        }
        if (!in_array($file["type"], $this->file_types)) {
            return "文件類型不符!" . $file["type"];
        }
        if (!file_exists($this->destination_folder)) {
            mkdir($this->destination_folder);
        }
        $filename = $file["tmp_name"];
        //獲得文件類型
        $p_info = pathinfo($file["name"]);
        $f_type = $p_info["extension"];
        $destination = $this->destination_folder . time() . "." . $f_type;
        if (file_exists($destination)) {
            return "同名文件已經(jīng)存在了";
        }
        if (!move_uploaded_file($filename, $destination)) {
            return "移動(dòng)文件出錯(cuò)";
        }
        //獲得圖片信息
        //Array ( [0] => 200 [1] => 200 [2] => 2 [3] => width="200" height="200" [bits] => 8 [channels] => 3 [mime] => image/jpeg )
        $image_info = getimagesize($destination);
        if ($this->is_water) {

            $this->waterMark($destination, $image_info);
        }
        switch ($image_info[2]) {
            case 2:
                $simage = imagecreatefromjpeg($destination);//創(chuàng)建新圖像
                $this->resizeImage($simage, $this->resize_width, $this->resize_height, $destination, "jpeg");
                break;
            case 3:
                $simage = imagecreatefrompng($destination);
                $this->resizeImage($simage, $this->resize_width, $this->resize_height, $destination, "png");
                break;
            case 6:
                $simage = imagecreatefromwbmp($destination);
                $this->resizeImage($simage, $this->resize_width, $this->resize_height, $destination, "wbmp");
                break;
        }
//        $p_info = pathinfo($destination);
//        $f_name = $p_info["basename"];
//        $image_size = getimagesize($filename);
//        echo " 文件名:" . $this->destination_folder . $f_name . "
";
//        echo " 寬度:" . $image_size[0];
//        echo " 長(zhǎng)度:" . $image_size[1];
//        echo "
 大小:" . $file["size"] . " bytes";
        return $destination;
    }

    private function waterMark($destination, $image_size)
    {
        $iinfo = getimagesize($destination, $iinfo);
        $nimage = imagecreatetruecolor($image_size[0], $image_size[1]);
        $white = imagecolorallocate($nimage, 255, 255, 255);
        $black = imagecolorallocate($nimage, 0, 0, 0);
        imagefill($nimage, 0, 0, $white);
        switch ($iinfo[2]) {
            case 1:
                $simage = imagecreatefromgif($destination);
                break;
            case 2:
                $simage = imagecreatefromjpeg($destination);
                break;
            case 3:
                $simage = imagecreatefrompng($destination);
                break;
            case 6:
                $simage = imagecreatefromwbmp($destination);
                break;
            default:
                die("不支持的文件類型");
        }

        imagecopy($nimage, $simage, 0, 0, 0, 0, $image_size[0], $image_size[1]);
        imagefilledrectangle($nimage, 1, $image_size[1] - 15, 80, $image_size[1], $white);

        switch ($this->water_type) {
            case 1:   //加水印字符串
                imagestring($nimage, 2, 3, $image_size[1] - 15, $this->water_string, $black);
                break;
            case 2:   //加水印圖片
                $simage1 = imagecreatefromgif("xplore.gif");
                imagecopy($nimage, $simage1, 0, 0, 0, 0, 85, 15);
                imagedestroy($simage1);
                break;
        }

        switch ($iinfo[2]) {
            case 1:
                imagejpeg($nimage, $destination);
                break;
            case 2:
                imagejpeg($nimage, $destination);
                break;
            case 3:
                imagepng($nimage, $destination);
                break;
            case 6:
                imagewbmp($nimage, $destination);
                //imagejpeg($nimage, $destination);
                break;
        }

        //覆蓋原上傳文件
        imagedestroy($nimage);
        imagedestroy($simage);
    }

    private function resizeImage($im, $max_width, $max_height, $name, $file_type)
    {
        $pic_width = imagesx($im);//源圖像寬度
        $pic_height = imagesy($im);//源圖像高度
        $width_tag = false;
        $height_tag = false;
        $width_ratio = 0;
        $height_ratio = 0;
        $ratio = 0;
        if (($max_width && $pic_width > $max_width) || ($max_height && $pic_height > $max_height)) {
            if ($max_width && $pic_width > $max_width) {
                $width_ratio = $max_width / $pic_width;
                $width_tag = true;
            }
            if ($max_height && $pic_height > $max_height) {
                $height_ratio = $max_height / $pic_height;
                $height_tag = true;
            }
            if ($width_tag && $height_tag) {
                if ($width_ratio < $height_ratio)
                    $ratio = $width_ratio;
                else
                    $ratio = $height_ratio;
            }
            if ($width_tag && !$height_tag) {
                $ratio = $width_ratio;
            }

            if ($height_tag && !$width_tag) {
                $ratio = $height_ratio;
            }
            $new_width = $pic_width * $ratio;
            $new_height = $pic_height * $ratio;
            if (function_exists("imagecopyresampled")) {
                $new_im = imagecreatetruecolor($new_width, $new_height);//創(chuàng)建一個(gè)空?qǐng)D片資源
                imagecopyresampled($new_im, $im, 0, 0, 0, 0, $new_width, $new_height, $pic_width, $pic_height);//等比縮放
            } else {
                $new_im = imagecreate($new_width, $new_height);//創(chuàng)建一個(gè)空?qǐng)D片資源
                imagecopyresized($new_im, $im, 0, 0, 0, 0, $new_width, $new_height, $pic_width, $pic_height);
            }
            switch ($file_type) {
                case "jpeg":
                    imagejpeg($new_im, $name);
                    break;
                case "png":
                    imagepng($new_im, $name);
                    break;
                case "wbmp":
                    imagewbmp($new_im, $name);
                    break;
            }
            imagedestroy($new_im);
        } else {
            if (function_exists("imagecopyresampled")) {
                $new_im = imagecreatetruecolor($max_width, $max_height);//創(chuàng)建一個(gè)空?qǐng)D片資源
                imagecopyresampled($new_im, $im, 0, 0, 0, 0, $max_width, $max_height, $pic_width, $pic_height);//等比縮放
                echo 1111;
            } else {
                $new_im = imagecreate($max_width, $max_width);//創(chuàng)建一個(gè)空?qǐng)D片資源
                imagecopyresized($new_im, $im, 0, 0, 0, 0, $max_width, $max_height, $pic_width, $pic_height);
            }
            switch ($file_type) {
                case "jpeg":
                    imagejpeg($new_im, $name);
                    break;
                case "png":
                    imagepng($new_im, $name);
                    break;
                case "wbmp":
                    imagewbmp($new_im, $name);
                    break;
            }
            imagedestroy($new_im);
        }
    }
}

$f = new FileUploadUtil();
$destination = $f->fileUpload();
$image_size = getimagesize($destination);
echo " 文件名:" . $destination . "
";
echo " 寬度:" . $image_size[0];
echo " 長(zhǎng)度:" . $image_size[1];
?>