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超轻量级php框架startmvc

PHP添加图片水印、压缩、剪切的封装类

更新时间:2020-03-05 11:48:48 作者:startmvc
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

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。

添加水印 图片添加水印