[PHP]代码

<?php   require('conn.php');  $sql="select title from content order by id desc limit 20"; //判断标题相似度  $result=mysql_query($sql,$conn);  $cf=0;  while($row=mysql_fetch_array($result)){  similar_text($row['title'], $title, $percent); //比较相似度 存放于$percent  if($percent>90){$cf=1;break;} //飘易注:相似度高于90% 则判断重复  }  if($cf==1){  echo "<SCRIPT language=JavaScript>alert('抱歉！禁止发布重复信息！');";  echo "this.location.href='vbscript:history.back()';</SCRIPT>";  mysql_close();  exit();  }  ?>