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PhP比较字符串相似度

<?php 
require(&#39;conn.php&#39;);
$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[&#39;title&#39;], $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(&#39;抱歉!禁止发布重复信息!&#39;);";
echo "this.location.href=&#39;vbscript:history.back()&#39;;</SCRIPT>";
mysql_close();
exit();
}
?>

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