requestsFunctions.php

<?php
require_once('twitter-api-php/TwitterAPIExchange.php');

// Setting the tokens
$settings = array(
    'oauth_access_token' => "249812568-EyGhArdh30XWVDx0Jm5TSzrN5e4nTQn5E6amqXfT",
    'oauth_access_token_secret' => "GI9gm7Kc9afhZAo38N2sZrm0A6jtSdko9TDm5x6vbSYMx",
    'consumer_key' => "ckY8XEGzCv1gXdTNLhpCEW2UF",
    'consumer_secret' => "7N6RGBZh7iBOiX0WgNlRgD7aQwY8BuERtQ0mMAysKqMTxeXZNx"
);


function getUserByUsername($username) {
    global $settings;

    $url = 'https://api.twitter.com/1.1/users/lookup.json';
    $getfield = '?screen_name='.$username;
    $requestMethod = 'GET';

    $twitter = new TwitterAPIExchange($settings);
    $response = $twitter
                       ->setGetfield($getfield)
                       ->buildOauth($url, $requestMethod)
                       ->performRequest();
    $response = json_decode($response);

    return $response[0];
}


/*
 * if array_key_exist($errors) -> print error
 */
function getUserById($id) {
    global $settings;

    $url = 'https://api.twitter.com/1.1/users/show.json';
    $getfield = '?user_id='.$id;
    $requestMethod = 'GET';

    $twitter = new TwitterAPIExchange($settings);
    $response = $twitter
                       ->setGetfield($getfield)
                       ->buildOauth($url, $requestMethod)
                       ->performRequest();
    $response = json_decode($response);

    return $response;
}


function searchUser($keyword) {
    global $settings;

    $url = 'https://api.twitter.com/1.1/users/search.json';
    $getfield = '?q='.$keyword;
    $requestMethod = 'GET';

    $twitter = new TwitterAPIExchange($settings);
    $response = $twitter
                       ->setGetfield($getfield)
                       ->buildOauth($url, $requestMethod)
                       ->performRequest();
    $response = json_decode($response);

    return $response;
}