Ordering numered lists

[Schlo_50]

Hello, I have produced a noteboard style calendar where all events of a particular month are called using a funcion and then number representing the date is echoed out along with its event. The information stored in my .txt file looks like this:  5th|May|Meeting for charity

 

I'd like to know if possible the code which will order the numbers from the lowest to highest number.

 

<?php

function getevents($eventmonth){

$file = file("data.txt"); 

foreach($file as $key => $val){ 

  $data[$key] = explode("|", $val); 

  $day = $data[$key][0];
  $month = $data[$key][1];
  $event = $data[$key][2];

  if($month == $eventmonth){ 

   $out = "$day - $event<br>\n";
   print $out;

  }

}

}

getevents("May");
?>

 

Could someone revise some code into that just to make the dates appear in order from the start of the month to the end of the month please?

 

Thanks for any help!