How to get PHP to Order by Day of Month when processing an XML file

Hello I need to get PHP to order the output of the XML file
to be
ACENDING to the numerical value of the XML
<start_day></start_day>
tags


PHP Script...
<?php
 function makexmltree($getmonth) {

  $doc = new DOMDocument();
  $doc->load( 'newxml.xml' );
  //gets info from xml

  $icount == 1;
  echo "<br><table width='100%' border='0'
cellpadding='5'
cellspacing='0' class='table_searchresult2'>";

  $books = $doc->getElementsByTagName( "event"
);
  foreach( $books as $book )
  {

	 $product_nos = $book->getElementsByTagName(
"product_no" );
	 $product_no = $product_nos->item(0)->nodeValue;

 	 $product_codes = $book->getElementsByTagName(
"product_code" );
 	 $product_code =
$product_codes->item(0)->nodeValue;

 	 $product_names = $book->getElementsByTagName(
"product_name" );
	 $product_name = $product_names->item(0)->nodeValue;

 	 $event_venues = $book->getElementsByTagName(
"event_venue" );
	 $event_venue = $event_venues->item(0)->nodeValue;

	 $bookpaths = $book-
>getElementsByTagName(
"running_period_of_event" );

	foreach( $bookpaths as $bookpath )
 	 {


	 $start_days= $bookpath->getElementsByTagName(
"start_day" );
 	 $start_day= $start_days->item(0)->nodeValue;

	 $start_months= $bookpath->getElementsByTagName(
"start_month" );
 	 $start_month= $start_months->item(0)->nodeValue;

	 $start_years= $bookpath->getElementsByTagName(
"start_year" );
 	 $start_year= $start_years->item(0)->nodeValue;

	 $end_days= $bookpath->getElementsByTagName(
"end_day" );
 	 $end_day= $end_days->item(0)->nodeValue;

	 $end_months= $bookpath->getElementsByTagName(
"end_month" );
 	 $end_month= $end_months->item(0)->nodeValue;

	 $end_years= $bookpath->getElementsByTagName(
"end_year" );
 	 $end_year= $end_years->item(0)->nodeValue;
	  }

//start build... for each

if ($start_month == $getmonth) {

	echo "<tr>";

	if (($icount) == 1) {
		$tablecolour = "<td bgcolor='#CCCCCC'>";
		$icount = "0";
	} else {
		$tablecolour = "<td bgcolor='#FFFFFF'>";
		$icount = 1;
	}

	echo $tablecolour
		."<a href='http://www.visitbirmingham.com/exec/103657/31676/pno
=".
$product_no
		.",pcode=".$product_code
		."'
target='_blank'>".$product_name."</a><
br>"
		."<strong>".$event_venue."&nbsp;&
lt;/strong></td>"
		.$tablecolour
		.$start_day."&nbsp;"
		.$start_month."&nbsp;-&nbsp;"
		.$end_day."&nbsp;"
		.$end_month."&nbsp;"
		.$end_year."</td></tr>"/n;


}
  $start_day = "";
  $start_month = "";
  $start_year ="";
  $end_day = "";
  $end_month ="";
  $end_year="";
  $event_venue="";
  $product_name="";
  $product_code="";
  $product_no="";

  }
  	echo "</table>";

makexmltree("July");

?>

XML File (trimed down)

<dataroot>

<event><product_no>10790</product_no>
<product_code>GBMBL6295E</product_code>
<product_name>Gwen Stefani</product_name>
<running_period_of_event>
<start_day>25</start_day>
<start_month>September</start_month>
<start_year>2007</start_year>
<end_day>25</end_day>
<end_month>September</end_month>
<end_year>2007</end_year>
</running_period_of_event>
<event_venue>The nia academy</event_venue>
</event>

<event>
<product_no>3027</product_no>
<product_code>GBMBL0329E</product_code>
<product_name>Berlioz Restaurant</product_name>
<running_period_of_event>
<start_day>10</start_day>
<start_month>May</start_month>
<start_year>2006</start_year>
<end_day>10</end_day>
<end_month>May</end_month>
<end_year>2010</end_year>
</running_period_of_event>
<event_venue></event_venue>

</event>
</dataroot>


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