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Homephp教程php手册探讨PHP GD库实现中文水印的方法

探讨PHP GD库实现中文水印的方法

Jun 13, 2016 am 11:10 AM
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当我们在网站中上传图片时,很多都有在图片上添加水印的需求。下面我们就为大家详细讲解

PHP GD库实现中文水印的相关代码示例:

  1.  ?php   
  2. $im = imagecreatetruecolor(100,100);  
  3. //新建一个真彩色图像   
  4. $white = imagecolorallocate($im,255,235,255);  
  5. //为一幅图像分配颜色,这一点和我的设计常识有区别..
    我从来没想过,在绘画时,要先给指定的图像标识分配颜色
    ..这个函数经常和imagefill函数搞混.   
  6. imagefill($im,0,0,$white);  
  7.  //区域填充   
  8. $black = imagecolorallocate($im,250,50,50);  
  9. //为一幅图像分配颜色   
  10. imagerectangle($im,5,5,50,50,$black);  
  11. //绘制一个矩形   
  12. header("Content-type: image/jpeg");   
  13. //发送标头,配合imagejpeg直接在浏览器中输出图像。   
  14. imagejpeg($im,'ImageName',100);  
  15. //输出一个像图,定名与质量   
  16. imagedestroy($im);  
  17. //释放与 image 关联的内存。image 
    是由图像创建函数返回的图像标识符   
  18. ?>  

PHP GD库实现中文水印代码

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php   </span></span></span></li>
<li><span>Header("Content-type: image/png");   </span></li>
<li class="alt"><span>/*通知浏览器,要输出图像*/   </span></li>
<li>
<span>$</span><span class="attribute">im</span><span> = </span><span class="attribute-value">imagecreate</span><span>(400 , 300);   </span>
</li>
<li class="alt"><span>/*定义图像的大小*/   </span></li>
<li>
<span>$</span><span class="attribute">gray</span><span> = </span><span class="attribute-value">ImageColorAllocate</span><span>($im , 235 , 235 , 235);   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">pink</span><span> = </span><span class="attribute-value">ImageColorAllocate</span><span>($im, 255 , 128 , 255);   </span>
</li>
<li><span>/*   </span></li>
<li class="alt">
<span>$</span><span class="attribute">fontfile</span><span> = </span><span class="attribute-value">"C:WINDOWSFontsSIMHEI.TTF"</span><span>;   </span>
</li>
<li><span>不好意思,这句老是粘上后一提交就丢了,不知道是怎么回事<br>,想测试的朋友们将注释去了现测试吧   </span></li>
<li class="alt"><span>*/   </span></li>
<li><span>/* $fontfile 字体的路径,视操作系统而定,可以是 <br>simhei.ttf(黑体) , SIMKAI.TTF(楷体) , <br>SIMFANG.TTF(仿宋) ,SIMSUN.TTC(宋体&新宋体) <br>等 GD 支持的中文字体*/   </span></li>
<li class="alt">
<span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">iconv</span><span>('GB2312','UTF-8','中文水印!!!');   </span>
</li>
<li><span>/*将 gb2312 的字符集转换成 UTF-8 的字符*/   </span></li>
<li class="alt"><span>ImageTTFText($im, 30, 0, 50, 140, <br>$pink , $fontfile , $str);   </span></li>
<li><span>/* 加入中文水印 */   </span></li>
<li class="alt"><span>Imagepng($im);   </span></li>
<li><span>ImageDestroy($im);   </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>

以上就是PHP GD库实现中文水印的相关方法总结。


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