Viewing file:  3.php (1.91 KB) -rw-rw-rw-
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<?php
/**
* Write a cache file
* @param string contents of the buffer
* @param string filename to use when creating cache file
* @return void
*/
function writeCache ($content,$filename) {
$fp = fopen('./cache/'.$filename,'w');
fwrite($fp,$content);
fclose($fp);
}
/**
* Checks for cache files
* @param string filename of cache file to check for
* @param int maximum age of the file in seconds
* @return mixed either the contents of the cache or false
*/
function readCache ($filename,$expiry) {
if ( file_exists('./cache/'.$filename) ) {
if ( (time() - $expiry) > filemtime('./cache/'.$filename) ) {
return false;
}
$cache = file('./cache/'.$filename);
return implode('',$cache);
}
return false;
}
// Start buffering the output
ob_start();
// Handle the page header
if ( !$header = readCache('3_header.cache',604800) ) {
// Display the header
?>
<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> Chunked Cached Page </title>
</head>
<body>
The header time is now: <?php echo (date('H:i:s')); ?><br />
<?php
$header = ob_get_contents();
ob_clean();
writeCache($header,'3_header.cache');
}
// Handle body of the page
if ( !$body = readCache('4_body.cache',5) ) {
echo ( 'The body time is now: '.date('H:i:s').'<br />' );
$body = ob_get_contents();
ob_clean();
writeCache($body,'3_body.cache');
}
// Handle the footer of the page
if ( !$footer = readCache('3_footer.cache',604800) ) {
?>
The footer time is now: <?php echo (date('H:i:s')); ?><br />
</body>
</html>
<?php
$footer = ob_get_contents();
ob_clean();
writeCache($footer,'3_footer.cache');
}
// Stop buffering
ob_end_clean();
// Display the contents of the page
echo ( $header.$body.$footer );
?>
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