A snippet to illustrate

fetch poll takers

Replace this code:

/* Create an Array of people to be called */
$people = array(
    0 => "415-555-1234",
    1 => "415-555-2345",
    2 => "415-555-3456"
);

With this:

$sql = "SELECT phone_number, name FROM poll_takers";
$query = mysql_query($sql);

$people = array();

while($row = mysql_fetch_row($query, MYSQL_ASSOC)) {
  $people[] = $row['phone_number'];
}

poll_takers.sql

CREATE TABLE `poll_takers` (
 id int auto_increment not null primary key,
 phone_number varchar(20) not null default '',
 name varchar(20) not null default ''
);

INSERT INTO `poll_takers` (phone_number, name) VALUES
   ('+14045551212', 'Bob'), 
   ('+17705551212', 'Sam');