php: Fetch public user tweets

functions.php

<?php

// Functions to fetch public tweets of any user
// Let's update this

function get_tweets($screen_name = 'vinnizworld'){
	
	$api_url = "https://api.twitter.com/1/statuses/user_timeline.json";
	$feed = $api_url."?screen_name=".$screen_name."&limit=20";
	$headers = get_headers($feed);
	$tweets = array();
	if (!strpos($headers[0], '200')) {
		return false;
	}
	else{
		
		$a = json_decode(file_get_contents($feed));
		foreach($a as $status){
			$tweet['status'] = $status->text;
			$tweet['posted_on'] = date("Y-m-d h:m:s",strtotime($status->created_at));
			array_push($tweets,$tweet);
		}
		return $tweets;
		 
	}
}