Speedy Cache

gistfile1.txt

<?php 
/**
 * Speedy cache 
 *
 */

$url = "http://thisis.la";

$file_path = getcwd() . '/cache';

if ( is_expired( $file_path ) ) {
  $output = get_url( $url );
	$fh = fopen( $file_path , 'w');
	fwrite( $fh, watermark( $output ) );
} else {
	$output = file_get_contents( $file_path );
}

echo $output;

function is_expired( $file_path, $expiry_age  = 1800 ) {
	if ( !file_exists( $file_path ) ) return true;
	return (mktime() - filemtime( $file_path )) >= $expiry_age;
}

function file_writable( $file_path ) {
	return $fh = fopen( $file_path, 'w');
}

function get_url( $url ) {
	$ch = curl_init();

	curl_setopt($ch, CURLOPT_URL, $url );
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

	// Grab 
	if ( !$result = curl_exec($ch) ) {
		trigger_error('Failed to fetch ' . $url );
	}
	curl_close($ch);

	return $result;
}


function watermark( $output ) {
	return $output .= '<!-- Cached at '. date("Y/m/d G:i:s") .' -->';
}