$kontrol=mysql_num_rows(mysql_query("Select * from wp_posts where post_name='$seobaslik'"));

if ($kontrol=='1') {
echo "$seobaslik=>>> daha önce eklenmiş.<br>";
} else {
mysql_query("Insert Into wp_posts (guid,post_author,post_date,post_date_gmt,post_con tent,post_title,post_status,comment_status,ping_st atus,post_name,post_modified,post_modified_gmt,pos t_type) values ('".$guid."','1',Now(),Now(),'','".$baslik."','pub lish','open','open','".$seobaslik."',Now(),Now(),' post')");
echo "$seobaslik ==>>> Eklendi<br>";
}


böyle kontrol edebilirsin.