file_get_contents file_put_contents

file_get_cached.php

<?php
function file_get_cached($url) 
{
    //config	 
    $dir	= 'cache';
    $day	= 86400;		//seconds
	
    $file = $dir . DIRECTORY_SEPARATOR . md5($url);
	
    if (file_exists($file) && filemtime($file) > (time() - $day)) {
		$o = file_get_contents($file);
    }
	else 
	{
		$o = file_get_contents($url);
		     file_put_contents($file, $o);
	}
    return $o;
}