Code Examples -> CachedFastTemplate class, extends CDI's FastTemplate to allow page caching

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PHP Code Examples

Title :	CachedFastTemplate class, extends CDI's FastTemplate to allow page caching
Categories :	HTML and PHP, HTML, PHP Classes	Jesus M. Castagnetto
Date :	Feb 01st 2000
Grade :	1 of 5 (graded 1 times)
Viewed :	5563
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Search :	More code by Jesus M. Castagnetto
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Code

===== CachedFastTemplate class =====

<?php

/*
* Class CachedFastTemplate
* by Jesus M. Castagnetto (jesusmc@scripps.edu)
* (c) 2000. Version 1.0
*
* Description:
* This class extends CDI's (cdi@thewebmasters.net) FastTemplate class,
* implementing methods to cache the output to a file. This would be
* useful for cases in which a template is used for both, the static
* pages in a web site, and pages created from PHP scripts. In this
* way we will avoid processing pages that do not change too often.
*/

class CachedFastTemplate extends FastTemplate {

var $CACHEDIR = "./cache"; // directory to save cached files
var $CACHELENGTH = 30; // length of caching, 30 days.

function CachedFastTemplate($path_to_tpls="", $cdir="", $clen="") {
$this->FastTemplate($path_to_tpls);
if (!empty($cdir)) {
$this->set_cache_dir($cdir);
}
if (!empty($clen)) {
$this->set_cache_length($clen);
}
}

function set_cache_dir($dir) {
if (substr($dir,(strlen($dir) - 1), 1) == "/") {
$dir = substr($dir,0,-1);
}
$this->CACHEDIR = $dir;
}

function set_cache_length($length) {
$this->CACHELENGTH = $length;
}

function write_to_cache($filename="", $content="") {
global $PHP_SELF;
if (empty($filename)) {
$filename = str_replace("/", "_", $PHP_SELF);
}
if (empty($content)) {
$content = $this->fetch();
}
// write the contents
$fp = fopen($this->CACHEDIR."/".$filename.".cache", "w");
fwrite($fp,$content);
fclose($fp);
// write the cache control file
$datestamp = $this->_mkdatestamp();
$fp = fopen($this->CACHEDIR."/".$filename.".cntrl", "w");
fwrite($fp, $datestamp.":".$this->CACHELENGTH);
fclose($fp);
}

function read_from_cache($filename="") {
global $PHP_SELF;
if (empty($filename)) {
$filename = str_replace("/", "_", $PHP_SELF);
}
if ($this->is_cached($filename)) {
readfile($this->CACHEDIR."/".$filename.".cache");
return true;
} else {
return false;
}
}

function is_cached($filename) {
return (is_file($this->CACHEDIR."/".$filename.".cache") &&
is_file($this->CACHEDIR."/".$filename.".cntrl"));
}

function valid_cache_file($filename="") {
global $PHP_SELF;
if (empty($filename)) {
$filename = str_replace("/", "_", $PHP_SELF);
}
if ($this->is_cached($filename)) {
$info = file($this->CACHEDIR."/".$filename.".cntrl");
$val = explode(":", $info[0]);
$today = $this->_mkdatestamp();
return ( $this->_diff_days($today, $val[0]) <= $val[1] );
} else {
return false;
}
}

function _mkdatestamp() {
$now = getdate(time());
return mktime(0, 0, 0, $now["mon"], $now["mday"], $now["year"]);
}

function _diff_days($end, $start) {
return intval(($end - $start)/(60*60*24));
}

} // end of class definition
?>

===== test_class.php =====

<?php

// This test file is a simple modification of a
// sample file include in FastTemplate

require ("./class.FastTemplate.php3");
require ("./class.CachedFastTemplate.php3");

$tpl = new CachedFastTemplate("./templates");

// for benchmarking
// $start = $tpl->utime();

$filename = "yipeee.html";
// if the filename is empty, the class will use PHP_SELF

// Check if we can send the cached file
if ($tpl->valid_cache_file($filename)) {
echo "FROM CACHE\n ";
$tpl->read_from_cache($filename);
$end = $tpl->utime();
$runtime = ($end - $start)*1000;
echo "Completed in $runtime miliseconds \n";
exit;

// Otherwise process the page
// the templates are distributed w/FastTemplate
$tpl->define(
array(
main => "main.tpl",
table => "table.tpl",
row => "row.tpl"
)
);

$tpl->assign( array( TITLE => "FastTemplate Test") );

for ($n=1; $n <= 3; $n++)
{
$Number = $n;
$BigNum = $n*10;

$tpl->assign(
array(
NUMBER => $Number,
BIG_NUMBER => $BigNum
)
);

$tpl->parse(ROWS,".row");
}

$tpl->parse(MAIN, array("table","main"));

$data = $tpl->fetch();
$tpl->write_to_cache($filename, $data);

$tpl->FastPrint();

// for benchmarking
// $end = $tpl->utime();
// $runtime = ($end - $start)*1000;
// echo "Completed in $runtime miliseconds \n";
exit;

?>

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