Insert query in mysql with php

The syntax for inserting values into tables,

INSERT INTO
    table_name (`col1`, `col2`, `col3`,.....)
    VALUES ('val1', 'val2', 'val3',.....);    

<?php

$con = mysql_connect('localhost', 'root','');
mysql_select_db('dbname', $con) or die(mysql_error());

$query = "INSERT INTO table_name (`sno`, `name`, `marks`, `rank`,`post_of_date`) VALUES ('3', 'PHP Developer', '521', '36',now())";    
$ok = mysql_query($query);

if($ok)
echo "Inserted successfully";
else
echo "Data's are not inserted in to table";

?>

sno	name	marks	rank	post_of_date
1	Ram	407	3	09-04-2001
2	krishnan	397	3	09-04-2001
3	PHP Developer	521	36	27-03-2012