twitter user_id <=> screen_name convert

twitter_user_id_2_screen_name.php

<?php

$user_id = "5168731";
$screen_name = "mugng";

var_dump(
  u2s( "5168731" ), // string(5) "mugng"
  s2u( "mugng" )    // string(7) "5168731"
);

/**
 * user_id 2 screen_name
 * @param string $user_id
 * @return string
 */
function u2s( $user_id ) {
  preg_match( "/class=\"nickname\">@(.+?)</uis", file_get_contents("https://twitter.com/intent/user?user_id={$user_id}"), $m );
  return isset( $m[1] ) ? $m[1] : null;
}

/**
 * screen_name 2 user_id
 * @param string $screen_name
 * @return string
 */
function s2u( $screen_name ) {
  preg_match( "/content=\"twitter\:\/\/user\?id=(.+?)\"/uis", file_get_contents("https://twitter.com/intent/user?screen_name={$screen_name}"), $m );
  return isset( $m[1] ) ? $m[1] : null;
}