// Simple Caching Code
$filename = "schoolSwap.js.cache";
$handle = fopen ($filename, 'r');
fgets($handle);
$versionHS = fgets($handle);
$versionCO = fgets($handle);
fclose($handle);
$versionHS = intval(trim($versionHS));
$versionCO = intval(trim($versionCO));
$query = "  SELECT *
		   FROM highschools
		   ORDER BY highschool_name
		";
$resultHS = MSSQL_QUERY($query);
$numRowsHS = MSSQL_NUM_ROWS($resultHS);
 
$query = "  SELECT *
		   FROM colleges
		   ORDER BY college_name
		";
$resultCO = MSSQL_QUERY($query);
$numRowsCO = MSSQL_NUM_ROWS($resultCO);
 
if($versionCO == $numRowsCO && $versionHS == $numRowsHS)
{
	// Use the cached version
	$handle = fopen ($filename, 'r');
	print fread($handle, filesize($filename));
	fclose($handle);
	exit();
}
$contents = "<!--
$numRowsHS
$numRowsCO
-->";
 
/* In this section you append the page content
    with $contents .= statements.
*/
 
print $contents;
 
if (is_writable($filename)) {
 
   if (!$handle = fopen ($filename, 'w+')) {
         echo "<!-- Cannot open file ($filename) -->";
         exit;
   }
 
   // Write $content to our opened file.
   if (fwrite($handle, $contents) === FALSE) {
       echo "<!-- Cannot write to file ($filename) -->";
       exit;
   }
 
   echo "<!-- Success, wrote cache to file ($filename) -->";
 
   fclose ( $handle ) ;
 
} else {
   echo "<!-- The file $filename is not writable -->";
}