This is a simple Instagram class that utilizes the Instagram API (http://instagram.com/developer/). The interface allows us to view our own feed (recent postings from people you're following) or get a random object ID (e.g., a photo or video), given a tag, and like the object.

A working example is at bot.php. Run a cronjob on bot.php and wala! You have automated your Instagram life. :)

1. Register your app client at Instagram here: http://instagram.com/developer/clients/register/
2. Once you have your client ID, client secret, and redirect uri, you need an access token for the account associated with your app. A Google search shows a million ways to get an access token, but I've gotten emails about it, so check out token.php as an example.

new Instagram() optionally takes up to 4 options. $client_id, $client_secret, $redirect_uri (your client settings given to you by Instagram).

• searchTag('tag') returns the JSON data for Instagram's search API.
• getUserFeed($num_results) returns the JSON data of the user's feed (the user associated with the access token). $num_results is optional and how many media objects you want returned. Instagram's default is 30.
• likeMedia($id, $log) likes the media object. Set $log to true if you want to log liked media in a log.txt file. Default is false.
• Check out bot.php for more info.

Say you want to like a random photo of the last X photos that show up on your feed:

<?php
$ig = new Instagram();
// sets access token
$ig->setAccessToken('access_token');
// get json data of user feed for last 5 media objects
$results = ig->getUserFeed(5);
// shuffle results
shuffle($results['data']);
// 'POST' a like to the object id.
$ig->likeMedia($results['data'][0]['id']);
?>