gistfile1.txt

$table = '_emails';
$id = 'id_emails';
$emailColumn = 'email_addr;'

$query = sprintf("INSERT INTO `%s`.`%s` (`%s`,`%s`) VALUES (NULL, '%s')",
                 $dbname,
                 $table,
                 $id,
                 $emailColumn,
                 mysql_real_escape_string($email));