Wordpress Plugin that allows for easy Instagram integration

binstagram.php

<?php
/*
Plugin Name: Instagram Integration
Plugin URI: http://roundedco.com
Description: Allows admin to manage instagram integration
Author: Brian Weinreich
Version: 1.0
Author URI: http://www.roundedco.com
*/

global $client_id;
global $client_secret;
global $redirect_uri;
global $instagram_id;

// your instagram app client id
$client_id = "123456";

// your instagram app client secret
$client_secret = "123456";

// this should be the FULL URL path to the plugin page ... i.e. /wp-admin/admin.php?page=binstagram.php
$redirect_uri = site_url()."/wp-admin/admin.php?page=binstagram.php";

// the users instagram ID
$instagram_id = "123456";

/********************************************************************/
/* Setting up the plugin (menu, settings page, etc)  							  */
/********************************************************************/

add_action('admin_menu', 'create_instagram_menu');

function create_instagram_menu() {
  add_menu_page('Instagram', 'Instagram', 'administrator', __FILE__, 'instagram_settings_page');
	add_action( 'admin_init', 'register_mysettings' );
}

function register_mysettings() {
	register_setting( 'instagram-settings-group', 'instagram_access_token' );
}

function instagram_settings_page() {
	global $client_id;
	global $redirect_uri;
?>
	<div class="wrap">
	<h2>Instagram</h2>
	<p>A valid access token is required to pull down the user's instagram feed and display it on the website. </p>
	<? check_for_access_token();?>
	<hr />
	<p><a class="button-primary" href="https://api.instagram.com/oauth/authorize/?client_id=<?=$client_id;?>&redirect_uri=<?=$redirect_uri;?>&response_type=code">Authorize Instagram</a></p>
	</div>
<?php } 

function check_for_access_token() {
	global $client_id;
	global $redirect_uri;
	global $client_secret;

	if(isset($_GET['code'])) {
		$url = 'https://api.instagram.com/oauth/access_token';
		$fields_string = "";
		$fields = array(
	    'client_id' => urlencode($client_id),
	    'client_secret' => urlencode($client_secret),
	    'grant_type' => urlencode("authorization_code"),
	    'redirect_uri' => urlencode($redirect_uri),
	    'code' => urlencode($_GET['code'])
		);
		foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
		rtrim($fields_string, '&');
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch,CURLOPT_URL, $url);
		curl_setopt($ch,CURLOPT_POST, count($fields));
		curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
		$result = curl_exec($ch);
		curl_close($ch);
		$result = json_decode($result);
		if(isset($result->error_type)) {
			echo "There was an error updating the access token";
			$access_token = get_option("instagram_access_token", "N/A");
		} else {
			$access_token = $result->access_token;
			update_option("instagram_access_token", $result->access_token);
		}
		echo '<script>window.location="'.$redirect_uri.'"</script>';
	} else {
		$access_token = get_option("instagram_access_token", "N/A");
	}
	echo "<p>Access token: <b>".$access_token."</b></p>";
}


/********************************************************************/
/* These are the functions you can call anywhere in the application */
/********************************************************************/

// $count = number of items to return
function instagram_feed($count) {
  global $instagram_id;
  $access_token = get_option("instagram_access_token");
	$url = "https://api.instagram.com/v1/users/".$instagram_id."/media/recent?count=".$count."&access_token=".$access_token;
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch,CURLOPT_URL, $url);
	$result = curl_exec($ch);
	curl_close($ch);
	$result = json_decode($result);
	return $result;
}

// $hashtag = #something
// $count = number of items to return
function get_pics_with_hashtag($hashtag, $count) {
	global $instagram_id;
	$access_token = get_option("instagram_access_token");
	$hashtag = str_replace("#","",$hashtag);
	$url = "https://api.instagram.com/v1/tags/".$hashtag."/media/recent?count=".$count."&access_token=".$access_token;
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch,CURLOPT_URL, $url);
	$result = curl_exec($ch);
	curl_close($ch);
	$result = json_decode($result);
	return $result;
}

?>