Custom version of my twitter cache that works with multiple usernames. Original here: http://christianvarga.com/how-to-get-public-feeds-using-twitters-v1-1-api/#comment-2121870201

twitter-cache.php

<?php

// call this script using a GET parameter, eg: http://your-domain.com/twitter-cache.php?screen_name=your_twitter_username

error_reporting( 0 ); // don't let any php errors ruin the feed

$username = $_GET['screen_name'];
$number_tweets = 4;
$feed = "https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name={$username}&count={$number_tweets}&include_rts=1";
$cache_file = dirname(__FILE__).'/cache/'.'twitter-cache-'.$username;
$modified = filemtime( $cache_file );
$now = time();
$interval = 600; // ten minutes

// check the cache file
if ( !$modified || ( ( $now - $modified ) > $interval ) ) {
  $bearer = 'AAAAAAAAAAAAAAAAAAAAA...AAAAAA';
  $context = stream_context_create(array(
    'http' => array(
      'method'=>'GET',
      'header'=>"Authorization: Bearer " . $bearer
      )
  ));
  
  $json = file_get_contents( $feed, false, $context );
  
  if ( $json ) {
    $cache_static = fopen( $cache_file, 'w' );
    fwrite( $cache_static, $json );
    fclose( $cache_static );
  }
}

header( 'Cache-Control: no-cache, must-revalidate' );
header( 'Expires: Mon, 26 Jul 1997 05:00:00 GMT' );
header( 'Content-type: application/json' );

$json = file_get_contents( $cache_file );
echo $json;