Simple PHP file cache
I try to share my experience
on write php code, in this time i will share simple php librarary for
caching content, this very simple. If you interesting you can get it
from my dropbox.
This the code:
class Cache
{
private $cachedir = '';
private $expire = 60;
public function __construct($cachedir = ''){
if ($cachedir !== ''){
if (!is_dir($cachedir) or !is_writable($cachedir)){
throw new Exception('Cache directory must be a valid writeable directory.');
}
$this->cachedir = $cachedir;
}
}
public function set($id, $data){
$file = $this->cachedir . $id;
if ( file_exists( $file ) ){
unlink($file);
}
if (!file_put_contents($file, serialize($data))){
throw new Exception('Error writing data to cache file.');
}
}
public function get($id){
$file = glob($this->cachedir . $id);
$file = array_shift($file);
if (!$data = file_get_contents($file))
{
throw new Exception('Error reading data from cache file.');
}
return unserialize($data);
}
public function valid($id,$set=''){
if($set !== ''){
return (bool)$set;
}
$file = glob($this->cachedir . $id);
$file = array_shift($file);
return (bool)(time() - filemtime($file) <= $this->expire);
}
public function delete($id){
$path = $this->cachedir . $id ;
if( file_exists( $path ) ) {
unlink( $path );
}
}
}
Example usage :
<!DOCTYPE HTML>
<head>
<meta http-equiv="content-type" content="text/html" />
<meta name="author" content="Jaksu" />
<title>Simple File Caching</title>
</head>
<body>
<?php
include 'cache.php';
$cache = new Cache('cache/');
$cache_data = 'simple file caching example';
$cache_id = '123';
if( $cache->valid( $cache_id ) ) {
$data = $cache->get( $cache_id );
} else {
$data = $cache_data;
$cache->set( $cache_id , $cache_data );
}
echo $data;
?>
</body>
</html>
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