为你讲解PHP给图片加水印的具体方法

我们在做网站的时候，都会遇到需要将网站上传的图片附加上水印，如果一个一个的手工加水印肯定非常麻烦，也是不实际的操作。那么，我们今天就向大家接受PHP给图片加水印的具体方法，简化操作步骤。

• 给图片加水印的具体代码如下：

  <ol class="dp-xml">
  <li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span>   </span></span></li>
  <li class=""><span>/******************************************************************************   </span></li>
  <li class="alt"><span> </span></li>
  <li class=""><span>参数说明:   </span></li>
  <li class="alt"><span>$max_file_size  : 上传文件大小限制, 单位BYTE   </span></li>
  <li class=""><span>$destination_folder : 上传文件路径   </span></li>
  <li class="alt"><span>$watermark   : 是否附加水印(1为加水印,其他为不加水印);   </span></li>
  <li class=""><span> </span></li>
  <li class="alt"><span>使用说明:   </span></li>
  <li class="">
  <span>1. 将PHP.INI文件里面的"</span><span class="attribute"><font color="#ff0000">extension</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">php_gd2</font></span><span>.dll"一行前面的;号去掉,因为我们要用到GD库;   </span>
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  <span>2. 将</span><span class="attribute"><font color="#ff0000">extension_dir</font></span><span> =改为你的php_gd2.dll所在目录;   </span>
  </li>
  <li class=""><span>******************************************************************************/   </span></li>
  <li class="alt"><span> </span></li>
  <li class=""><span>//上传文件类型列表   </span></li>
  <li class="alt">
  <span>$</span><span class="attribute"><font color="#ff0000">uptypes</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">array</font></span><span>(   </span>
  </li>
  <li class=""><span>    'image/jpg',   </span></li>
  <li class="alt"><span>    'image/jpeg',   </span></li>
  <li class=""><span>    'image/png',   </span></li>
  <li class="alt"><span>    'image/pjpeg',   </span></li>
  <li class=""><span>    'image/gif',   </span></li>
  <li class="alt"><span>    'image/bmp',   </span></li>
  <li class=""><span>    'image/x-png'   </span></li>
  <li class="alt"><span>);   </span></li>
  <li class=""><span> </span></li>
  <li class="alt">
  <span>$</span><span class="attribute"><font color="#ff0000">max_file_size</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">2000000</font></span><span>;     //上传文件大小限制, 单位BYTE   </span>
  </li>
  <li class="">
  <span>$</span><span class="attribute"><font color="#ff0000">destination_folder</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"uploadimg/"</font></span><span>; //上传文件路径   </span>
  </li>
  <li class="alt">
  <span>$</span><span class="attribute"><font color="#ff0000">watermark</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>;      //是否附加水印(1为加水印,其他为不加水印);   </span>
  </li>
  <li class="">
  <span>$</span><span class="attribute"><font color="#ff0000">watertype</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>;      //水印类型(1为文字,2为图片)   </span>
  </li>
  <li class="alt">
  <span>$</span><span class="attribute"><font color="#ff0000">waterposition</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>;     //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);   </span>
  </li>
  <li class="">
  <span>$</span><span class="attribute"><font color="#ff0000">waterstring</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"http://www.xplore.cn/"</font></span><span>;  //水印字符串   </span>
  </li>
  <li class="alt">
  <span>$</span><span class="attribute"><font color="#ff0000">waterimg</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"xplore.gif"</font></span><span>;    //水印图片   </span>
  </li>
  <li class="">
  <span>$</span><span class="attribute"><font color="#ff0000">imgpreview</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>;      //是否生成预览图(1为生成,其他为不生成);   </span>
  </li>
  <li class="alt">
  <span>$</span><span class="attribute"><font color="#ff0000">imgpreviewsize</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>/2;    //缩略图比例   </span>
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  <span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>   </span>
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  <span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">html</span><span class="tag">></span></span></font></strong><span>   </span>
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  <span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">head</span><span class="tag">></span></span></font></strong><span>   </span>
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  <li class="alt">
  <span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>ZwelL图片上传程序</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">title</span><span class="tag">></span></font></strong><span>   </span>
  </li>
  <li class="">
  <span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">style</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"text/css"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span>   </span>
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  <li class="alt"><span></span></li>
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