PHP添加图片水印、压缩、剪切的封装类


            给图片添加水印，其实就是把原来的图片和水印添加在一起，下面小编把最近整理的资料分享给大家。

php对图片文件的操作主要是利用GD库扩展。当我们频繁利用php对图片进行操作时，会自然封装很多函数，否则会写太多重复的代码。当有很多对图片的相关函数的时候，我们可以考虑将这些函数也整理一下，因而就有了封装成类的想法。

　　操作图片主要历经四个步骤：

        第一步：打开图片

        第二步：操作图片



        第三步：输出图片



        第四步：销毁图片



　　1,3,4三个步骤每次都要写，每次又都差不多。真正需要变通的只有操作图片的这一步骤了。操作图片又往往通过1或多个主要的GD函数来完成。

　　本文封装类里面的四种方法，文字水印（imagettftext()），图片水印（imagecopymerge()），图片压缩，图片剪切(imagecopyresampled())，其余的常用GD函数便不赘述。

直接上代码：





<?php 

class Image

{ 

 private $info;

 private $image;

 public $type;

 public function __construct($src)

 {

  $this->info=getimagesize($src);

  $this->type=image_type_to_extension($this->info['2'],false);

  $fun="imagecreatefrom{$this->type}";

  $this->image=$fun($src);

 }

 /**

  * 文字水印

  * @param [type] $font  字体

  * @param [type] $content 内容

  * @param [type] $size  文字大小

  * @param [type] $col  文字颜色（四元数组）

  * @param array $location 位置 

  * @param integer $angle 倾斜角度

  * @return [type]   

  */

 public function fontMark($font,$content,$size,$col,$location,$angle=0){

  $col=imagecolorallocatealpha($this->image, $col['0'], $col['1'], $col['2'],$col['3']);

  imagettftext($this->image, $size, $angle, $location['0'], $location['1'], $col,$font,$content);

 }

 /**

  * 图片水印

  * @param [type] $imageMark 水印图片地址

  * @param [type] $dst  水印图片在原图片中的位置

  * @param [type] $pct  透明度

  * @return [type]   

  */

 public function imageMark($imageMark,$dst,$pct){

  $info2=getimagesize($imageMark);

  $type=image_type_to_extension($info2['2'],false);

  $func2="imagecreatefrom".$type;

  $water=$func2($imageMark);

  imagecopymerge($this->image, $water, $dst[0], $dst[1], 0, 0, $info2['0'], $info2['1'], $pct);

  imagedestroy($water);

 }

 /**

  * 压缩图片

  * @param [type] $thumbSize 压缩图片大小

  * @return [type]   [description]

  */

 public function thumb($thumbSize){

  $imageThumb=imagecreatetruecolor($thumbSize[0], $thumbSize[1]);

  imagecopyresampled($imageThumb, $this->image, 0, 0, 0, 0, $thumbSize[0], $thumbSize[1], $this->info['0'], $this->info['1']);

  imagedestroy($this->image);

  $this->image=$imageThumb;

 }

 /**

 * 裁剪图片

  * @param [type] $cutSize 裁剪大小

  * @param [type] $location 裁剪位置

  * @return [type]   [description]

  */

  public function cut($cutSize,$location){

   $imageCut=imagecreatetruecolor($cutSize[0],$cutSize[1]);

   imagecopyresampled($imageCut, $this->image, 0, 0, $location[0], $location[1],$cutSize[0],$cutSize[1],$cutSize[0],$cutSize[1]);

   imagedestroy($this->image);

   $this->image=$imageCut;

  }

 /**

  * 展现图片

  * @return [type] [description]

  */

 public function show(){

  header("content-type:".$this->info['mime']);

  $funn="image".$this->type;

  $funn($this->image);

 }

 /**

  * 保存图片

 * @param [type] $newname 新图片名

 * @return [type]   [description]

 */

  public function save($newname){

   header("content-type:".$this->info['mime']);

   $funn="image".$this->type;

   $funn($this->image,$newname.'.'.$this->type);

  }

  public function __destruct(){

   imagedestroy($this->image);

  }

 }

 ?>



如果还需要其他操作，只需要再往这个类里面添加就好啦~~

给图片添加水印代码：

先看文件check_image_addwatermark.php代码





<?php 

//修改图片效果

$db = mysql_connect('localhost','root','Ctrip07185419') or die('can not connect to database');

mysql_select_db('moviesite',$db) or die(mysql_error($db));

//上传文件的路径

$dir = 'D:\Serious\phpdev\test\images';

//设置环境变量

putenv('GDFONTPATH='.'C:\Windows\Fonts');

$font = "arial";

//upload_image.php页面传递过来的参数，如果是上传图片

if($_POST['submit'] == 'Upload')

{

 if($_FILES['uploadfile']['error'] != UPLOAD_ERR_OK)

 {

  switch($_FILES['uploadfile']['error'])

  {

   case UPLOAD_ERR_INI_SIZE:

    die('The uploaded file exceeds the upload_max_filesize directive');

   break;

   case UPLOAD_ERR_FORM_SIZE:

    die('The upload file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form');

   break;

   case UPLOAD_ERR_PARTIAL:

    die('The uploaded file was only partially uploaded');

   break;

   case UPLOAD_ERR_NO_FILE:

    die('No file was uploaded');

   break;

   case UPLOAD_ERR_NO_TMP_DIR:

    die('The server is missing a temporary folder');

   break; 

   case UPLOAD_ERR_CANT_WRITE:

    die('The server fail to write the uploaded file to the disk');

   break;  

   case UPLOAD_ERR_EXTENSION:

    die('The upload stopped by extension');

   break;    

  }

 }

 $image_caption = $_POST['caption'];

 $image_username = $_POST['username'];

 $image_date = date('Y-m-d');

 list($width,$height,$type,$attr) = getimagesize($_FILES['uploadfile']['tmp_name']);

 $error = 'The file you upload is not a supported filetype';

 switch($type)

 {

  case IMAGETYPE_GIF:

   $image = imagecreatefromgif($_FILES['uploadfile']['tmp_name']) or die($error);

  break;

  case IMAGETYPE_JPEG:

   $image = imagecreatefromjpeg($_FILES['uploadfile']['tmp_name']) or die($error);

  break;

  case IMAGETYPE_PNG:

   $image = imagecreatefrompng($_FILES['uploadfile']['tmp_name']) or die($error);

  break;

  default:

  break;

 }

 $query = 'insert into images(image_caption,image_username,image_date) values("'.$image_caption.'" , "'.$image_username.'","'.$image_date.'")';

 $result = mysql_query($query,$db) or die(mysql_error($db));

 $last_id = mysql_insert_id();

 // $imagename = $last_id.'.jpg';

 // imagejpeg($image,$dir.'/'.$imagename);

 // imagedestroy($image);

 $image_id = $last_id;

 imagejpeg($image , $dir.'/'.$image_id.'.jpg');

 imagedestroy($image);

}

else //如果图片已经上传，则从数据库中取图片名字

{

 $query = 'select image_id,image_caption,image_username,image_date from images where image_id='.$_POST['id'];

 $result = mysql_query($query,$db) or die(mysql_error($db));

 extract(mysql_fetch_assoc($result));

 list($width,$height,$type,$attr) = getimagesize($dir.'/'.$image_id.'.jpg');

}

//如果是保存图片

if($_POST['submit'] == 'Save')

{

 if(isset($_POST['id']) && ctype_digit($_POST['id']) && file_exists($dir.'/'.$_POST['id'].'.jpg'))

 {

  $image = imagecreatefromjpeg($dir.'/'.$_POST['id'].'.jpg');

 }

 else

 {

  die('invalid image specified');

 }

 $effect = (isset($_POST['effect'])) ? $_POST['effect'] : -1;

 switch($effect)

 {

  case IMG_FILTER_NEGATE:

   imagefilter($image , IMG_FILTER_NEGATE);  //将图像中所有颜色反转

  break;

  case IMG_FILTER_GRAYSCALE:

   imagefilter($image , IMG_FILTER_GRAYSCALE); //将图像转换为灰度的

  break;

  case IMG_FILTER_EMBOSS:

   imagefilter($image , IMG_FILTER_EMBOSS);  //使图像浮雕化

  break;

  case IMG_FILTER_GAUSSIAN_BLUR:

   imagefilter($image , IMG_FILTER_GAUSSIAN_BLUR); //用高斯算法模糊图像

  break; 

 }

 if(isset($_POST['emb_caption']))

 {

  imagettftext($image , 12 , 0 , 20 , 20 , 0 , $font , $image_caption);

 }

 if(isset($_POST['emb_logo']))

 {

  //获取水印图片的尺寸并创建水印

  list($wmk_width , $wmk_height) = getimagesize('images/logo.png');

  $x = ($width-$wmk_width) / 2;

  $y = ($height-$wmk_height)/2;

  $wmk = imagecreatefrompng('images/logo.png');

  //把水印图片和原图片合并在一起

  imagecopymerge($image , $wmk , $x , $y , 0 , 0 , $wmk_width , $wmk_height , 20);

  //清除水印图片

  imagedestroy($wmk);

 }

 imagejpeg($image , $dir.'/'.$_POST['id'].'.jpg' , 100);

 ?>

 <html>

  <head>

   <title>Here is your pic!</title>

  </head>

  <body>

   <h1>Your image has been saved!</h1>

   <img src="images/<?php echo $_POST['id'];?>.jpg" alt="" />

  </body>

 </html>

<?php 

}

else

{

?>

 <html>

  <head>

   <title>Here is your pic!</title>

  </head>

  <body>

   <h1>So how does it feel to be famous?</h1>

   <p>Here is the picture you just uploaded to your servers:</p>

   <!--<img src="images/<?php echo $imagename;?>" alt="" style="float:left;" />-->

  </body>

 </html>

 <?php

  if($_POST['submit'] == 'Upload')

  {

   $imagename = 'images/'.$image_id.'.jpg';

  }

  else

  {

   $imagename = 'image_effect.php?id='.$image_id.'&e='.$_POST['effect'];

   if(isset($_POST['emb_caption']))

   {

    $imagename .= '&capt='.urlencode($image_caption);

   }

   if(isset($_POST['emb_logo']))

   {

    $imagename .= '&logo=1';

   }

  }

 ?>

 <img src="<?php echo $imagename;?>" style="float:left;" alt="" />

 <table>

  <tr>

   <td>Image save as:</td>

   <td><?php $image_id?></td>

  </tr>

  <tr>

   <td>Height:</td>

   <td><?php echo $height;?></td>

  </tr>

  <tr>

   <td>Widht:</td>

   <td><?php echo $width;?></td>

  </tr>

  <tr>

   <td>Upload date:</td>

   <td><?php echo $image_date;?></td>

  </tr>

 </table>

 <p>You may apply a special effect to your image from the list of option below.

 Note:saving an image with any of the filters applied <em>can be undone</em>

 </p>

 <form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">

  <div>

   <input type="hidden" name="id" value="<?php echo $image_id;?>"/>

   Filter:<select name="effect" id="">

    <option value="-1">None</option>

    <?php 

     echo '<option value="'.IMG_FILTER_GRAYSCALE.'" ';

     if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_GRAYSCALE)

     {

      echo 'selected="selected"';

     }

     echo ' >Black and white</option>';

     echo '<option value="'.IMG_FILTER_GAUSSIAN_BLUR.'"';

     if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_GAUSSIAN_BLUR)

     {

      echo ' selected="selected"';

     }

     echo '>Blur</option>';

     echo '<option value="'.IMG_FILTER_EMBOSS.'"';

     if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_EMBOSS)

     {

      echo 'selected="selected"';

     }

     echo '>Emboss</option>';

     echo '<option value="'.IMG_FILTER_NEGATE.'"';

     if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_NEGATE)

     {

      echo 'selected="selected"';

     }

     echo '>Negative</option>';

    ?>

   </select><br />

   <?php 

    echo '<input type="checkbox" name="emb_caption"';

    if(isset($_POST['emb_caption']))

    {

     echo ' checked="checked"';

    }

    echo ' />Embed caption in image?';

    echo '<br />';

    //添加水印选项

    echo '<input type="checkbox" name="emb_logo" ';

    if(isset($_POST['emb_logo']))

    {

     echo 'checked="checked"';

    }

    echo ' />Embed watermarked logo in image?';

   ?>

   <input type="submit" value="Preview" name="submit" /><br /><br />

   <input type="submit" value="Save" name="submit" />

  </div>

 </form>

<?php 

}

?>



这里面主要是添加水印选项，如果选中添加水印则将logo.png作为水印图片和原来的图片合并在一起。

在预览文件中添加了对应的逻辑，代码如下：







<?php 

$dir = 'D:\Serious\phpdev\test\images';

//设置环境变量

putenv('GDFONTPATH='.'C:\Windows\Fonts');

$font = "arial";

if(isset($_GET['id']) && ctype_digit($_GET['id']) && file_exists($dir.'/'.$_GET['id'].'.jpg'))

{

 $image = imagecreatefromjpeg($dir.'/'.$_GET['id'].'.jpg');

}

else

{

 die('invalid image specified');

}

$effect = (isset($_GET['e'])) ? $_GET['e'] : -1;

switch($effect)

{

 case IMG_FILTER_NEGATE:

  imagefilter($image , IMG_FILTER_NEGATE);

 break;

 case IMG_FILTER_GRAYSCALE:

  imagefilter($image , IMG_FILTER_GRAYSCALE);

 break; 

 case IMG_FILTER_EMBOSS:

  imagefilter($image , IMG_FILTER_EMBOSS);

 break; 

 case IMG_FILTER_GAUSSIAN_BLUR:

  imagefilter($image , IMG_FILTER_GAUSSIAN_BLUR);

 break; 

}

if(isset($_GET['capt']))

{

 //echo $_GET['capt'];

 imagettftext($image, 12, 0, 20, 20, 0, $font, $_GET['capt']);

}

if(isset($_GET['logo']))

{

 list($widht , $height) = getimagesize($dir.'/'.$_GET['id'].'.jpg');

 list($wmk_width , $wmk_height) = getimagesize('images/logo.png');

 $x = ($widht-$wmk_width) / 2;

 $y = ($height-$wmk_height) / 2;

 $wmk = imagecreatefrompng('images/logo.png');

 imagecopymerge($image , $wmk , $x , $y , 0 , 0 , $wmk_width , $wmk_height , 20);

 imagedestroy($wmk);

}

header('Content-Type:image/jpeg');

imagejpeg($image , '' , 100);

?>



最后上传的水印图片效果如下：



注意主要的逻辑就是通过 imagecopymerge() 方法把两个图片合并在一起造成水印效果。来看看这个方法的方法原型和参数：





bool imagecopymerge ( resource $dst_im , resource $src_im , int $dst_x , int $dst_y , int$src_x , int $src_y , int $src_w , int $src_h , int $pct )





将 src_im 图像中坐标从 src_x，src_y 开始，宽度为 src_w，高度为 src_h 的一部分拷贝到 dst_im 图像中坐标为 dst_x 和 dst_y 的位置上。两图像将根据 pct 来决定合并程度，其值范围从 0 到 100。当 pct = 0 时，实际上什么也没做，当为 100 时对于调色板图像本函数和 imagecopy() 完全一样，它对真彩色图像实现了 alpha 透明。



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