Netbeans says PHP function has too many lines - php

Question

I have a function and netbeans is saying I can only have 20 lines in my code.
Why is this and how could I fix this. I have another function with the same problem. Dreamweaver doesn't say anything so I don't know if this is a big problem.
my code:
function dispalyEvent($weekNr, $week, $year){
echo "<p>";
$gendate = new DateTime();
$gendate->setISODate($year,$week,$weekNr);
$month = $gendate->format('m');
$day = $gendate->format('d');
$event_query = mysql_query("SELECT * FROM calendar ORDER BY starttime");
while($event = mysql_fetch_array($event_query)) {
$startYear = $event['startyear'];
$startMonth = $event['startmonth'];
$startDay = $event['startdate'];
$endYear = $event['endyear'];
$endMonth = $event['endmonth'];
$endDay = $event['enddate'];
$period = new DatePeriod(
new DateTime($startYear.$startMonth.$startDay),
new DateInterval('P1D'),
new DateTime($endYear.$endMonth.$endDay +1)
);
$currentDate = $year."-".$month."-".$day;
foreach ($period as $savedDate) {
if ($currentDate == $savedDate->format('Y-m-d')){
if ($event['Approved'] == "Approved"){
echo "</p>";
echo "<p>";
if ($event['ad']) {
echo "<img src='images/".$event['ad']."' alt='event-ad' width='300' height='100' />";
} else { echo " "; }
echo "</p>";
echo "<p> </p>";
echo "<div class='toggleLink' style='cursor: pointer; color: #333;'>";
echo $event['starttime']." ".$event['title'];
echo "</p>";
echo "</div>";
echo " <div class='toggle'>";
echo "<p class='toggleLink'>";
echo "(".$event['starttime']."-".$event['endtime'].") ".$event['location']." - ".$event['address']." - Admission Price: $".$event['price']."<br>".$event['description'];
echo "</div>";
}}}}
echo "</p>";
}
?>