php - Can someone help me out with this mysql query -

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you have error in sql syntax; check manual corresponds mysql server version right syntax use near ')' 

$sql = "insert                      topics(topic_subject,                            topic_date,                            topic_cat,                            topic_by)                values('" . mysql_real_escape_string($_post['topic_subject']) . "',                            now(),                            " . mysql_real_escape_string($_post['topic_cat']) . ",                            " . $_session['fullname'] . "                            )";

you missing quotes around string values here new sql

ql = "insert                          topics(topic_subject,                                topic_date,                                topic_cat,                                topic_by)                    values('" . mysql_real_escape_string($_post['topic_subject']) . "',                                now(),                                '" . mysql_real_escape_string($_post['topic_cat']) . "',                                '" . $_session['fullname'] . "'                                )";

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