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Content cache an retrieve with PHP

Posted by Zareef in PHP on 11 20th, 2011 | no responses

Website with huge database is often slower when pulling data from another feed. It’s a total harass when hitting your database again and again after knowing it’s not changing so frequently. This snippet can query after the database updates. And it fetches data from cached content when database is not synchronized.

// JavaScript Document$TWITTER_FOLLOWERS_FILE_NAME = ‘twitter-followers.txt’;

$TWITTER_FOLLOWERS_URL = ‘http://twitter.com/users/show.json?screen_name=username’;

$TWITTER_FOLLOWERS = get_content($TWITTER_FOLLOWERS_FILE_NAME,$TWITTER_FOLLOWERS_URL,3,’format_followers’,array(‘file’=>$TWITTER_FOLLOWERS_FILE_NAME));

/* utility function */

function format_followers($content,$args) {

$content = json_decode($content);

$twitter_subscribers = $content->{‘followers_count’};

if($twitter_subscribers) {

$twitter_subscribers = number_format($twitter_subscribers,0,”,’,');

file_put_contents($args['file'],$twitter_subscribers);

return $twitter_subscribers;

}

This function is from basic language. Though it’s very handy for caching and retrieves content from databases. So don’t hesitate to use such conditions.

// JavaScript Documentfunction get_content($file,$url,$hours = 24,$fn = ”,$fn_args = ”) {

$current_time = time(); $expire_time = $hours * 60 * 60; $file_time = filemtime($file);

//decisions, decisions

if(file_exists($file) && ($current_time – $expire_time < $file_time)) {

return file_get_contents($file);

}

else {

$content = get_url($url);

if($fn) { $content = $fn($content,$fn_args); }

$content.= ”;

file_put_contents($file,$content);

return $content;