thinkphp I() 方法

    <form id="complai_form" method="post" action="{:U(‘Index/Complai‘)}">
        <div class="com_area">
            <div style="width:80%;height:50px;margin:0 auto;">
                <div class="ser_mbx">我要投诉</div>
            </div>
            <textarea rows="10" cols="80" class="com_text" name="yang" maxlength="500" style="width:80%;">
            </textarea>
            <div style="width:90%;height:20px;text-align:right;">
                <span style="font-size:12px;color:gray;">内容字数小于500字</span>
            </div>
            <div class="com_tbox">
              <input type="submit" id="subn" value="提交" />
            </div>
        </div>
    </form>

  $content = I(‘param.yang‘); //param.yang    yang等于name="yang" input或者是taxtarea的name名称 不是id
  var_dump($content);