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//查询是否存在当前注册用户名$query="select count(*) count from ershou_user where user_name='$user_name'";$result=mysql_query($query);while($info=mysql_fetch_array($result)){$count=$info["count"];}if($count==0){//不存在才执行注册 $sqladd="INSERT INTO ershou_user SET user_name='$user_name',user_pass='$user_pass',user_question='$user_question',user_angser='$user_angser',user_school='$user_school',user_phone='$user_phone',user_mphone='$user_mphone',user_qq='$user_qq',user_email='$user_email',user_kt='$user_kt',user_date=NOW()";else{//存在相同用户名则重新填写echo'<table width="100%" border="0" cellPadding="0" cellSpacing="0"><tr>">