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。

以上内容是本文介绍php给图片添加水印 压缩 剪切的封装类的全部内容，希望大家对本文介绍感兴趣。