latest-tweet.php

<?php
// Dont forget to load twitter oauth via Composer

$twitteruser = 'webfwd';
$tweetexpire = 60 * 30; // Seconds
$tweetfile = 'twitter.txt';

use Abraham\TwitterOAuth\TwitterOAuth;
if (!file_exists($tweetfile) || (time()-filemtime($tweetfile)) > $tweetexpire) {
    $connection = new TwitterOAuth(
        "", // API Key
        "", // API Secret
        "", // Access Token
        "" // Access Token Secret
    );
    $content = $connection->get("account/verify_credentials");
    $statuses = $connection->get('statuses/user_timeline', array('screen_name' => $twitteruser, 'exclude_replies' => 'true', 'include_rts' => 'false', 'count' => 1));
    $tweet = $statuses[0]->text;
    file_put_contents($tweetfile, $tweet);
} else $tweet = file_get_contents($tweetfile);

echo $tweet;