生成验证码-蒲公英云

生成验证码

一代码

<style type="text/css">
<!--
.STYLE1 {font-size: 13px}
.STYLE3 {font-size: 13px; font-weight: bold; }
.STYLE4 {
    font-size: 20px;
    font-family: "华文隶书";
    font-weight: bold;
}
-->
</style>
<table width="592" height="260" border="0" align="center" cellpadding="0" cellspacing="0" background="images/bg.jpg">
              <tr>
                <td width="251" height="30" align="center"> </td>
                <td width="99" align="center"> </td>
              </tr>
              <tr>
                <td height="90" align="center" valign="top"><table width="257" height="120" border="0" cellpadding="0" cellspacing="0">
                      <script language="javascript">
                         function chkuserinput(form)
                         {
                            if(form.yz.value=="")
                            {
                              alert("请输入验证码!");
                              form.yz.select();
                              return(false);
                            }
                            if(form.yz.value!=form.num.value)
                            {
                              alert("请输入正确的验证码!");
                              form.yz.select();
                              return(false);
                            }    
                           return(true);                 
                         }
                      </script>
                         <form name="form2" method="post"  onSubmit="return chkuserinput(this)">
                          <tr>
                            <td height="10" colspan="3"> </td>
                          </tr>
                          <tr>
                            <td width="60" height="20" align="right" class="STYLE1"><span class="STYLE3">验证码:</span></td>
                            <td width="70" height="20" class="STYLE1">
                                <input type="text" name="yz" size="10" class="inputcss" style="background-color:#e8f4ff " onMouseOver="this.style.backgroundColor='#ffffff'" onMouseOut="this.style.backgroundColor='#e8f4ff'">                            </td>
                            <td width="70" align="center" class="STYLE1">
                 <?php
                        function make_seed() 
                        {
                            list($seed, $seeds) = explode(' ', microtime());
                            return (float) $seeds + ((float) $seed * 100000); 
                        }
                        mt_srand(make_seed());
                        $mt_rand = mt_rand();
                        $num=substr($mt_rand,1,5);
                        for($i=0;$i<5;$i++)
                        {
                            echo "<img src=images/".substr(strval($num),$i,1).".gif>";
                        }
                ?>
                            </div></td>
                          </tr>
                          <tr>
                            <td height="30" colspan="3" align="center">
                                <input type="hidden" value="<?php echo $num;?>" name="num">
                                <input type="submit" class="buttoncss" value="提交">
                                <label>
                                  <input type="reset" name="Submit" value="重置" />
                                </label></td></tr>
                        </form>
                </table></td>
                <td align="center"> </td>
              </tr>
</table>