Explain to you the specific method of adding watermark to images in PHP_PHP Tutorial

When we are building a website, we will all encounter the need to add watermarks to the pictures uploaded on the website. It will definitely be very troublesome and impractical to add watermarks one by one manually. So, today we will accept the specific method of adding watermark to pictures in PHP and simplify the steps.

• The specific code to add watermark to the picture is as follows:

  <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>$watermark   : 是否附加水印(1为加水印,其他为不加水印);   </span></li>
  <li class=""><span> </span></li>
  <li class="alt"><span>使用说明:   </span></li>
  <li class="">
  <span>1. 将PHP.INI文件里面的"</span><span class="attribute"><font color="#ff0000">extension</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">php_gd2</font></span><span>.dll"一行前面的;号去掉,因为我们要用到GD库;   </span>
  </li>
  <li class="alt">
  <span>2. 将</span><span class="attribute"><font color="#ff0000">extension_dir</font></span><span> =改为你的php_gd2.dll所在目录;   </span>
  </li>
  <li class=""><span>******************************************************************************/   </span></li>
  <li class="alt"><span> </span></li>
  <li class=""><span>//上传文件类型列表   </span></li>
  <li class="alt">
  <span>$</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>
  </li>
  <li class="">
  <span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>   </span>
  </li>
  <li class="alt">
  <span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">html</span><span class="tag">></span></span></font></strong><span>   </span>
  </li>
  <li class="">
  <span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">head</span><span class="tag">></span></span></font></strong><span>   </span>
  </li>
  <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>
  </li>
  <li class="alt"><span></span></li>
  </ol>