get_functions_part.php

<?php

function smamo_include_functions_part_if_exists($fetch, $in = false){
    if ($in){$fetch = $in . '/' . $fetch;}
    $fetch = get_template_directory() . '/' . $fetch . '.php';
    if(file_exists($fetch)){include_once $fetch;} 
}

function get_functions_part($fetch, $in = false){
    if(is_array($fetch)){foreach($fetch as $p){smamo_include_functions_part_if_exists($p,$in);}}
    else{smamo_include_functions_part_if_exists($fetch,$in);} 
}

/*
Example use:

get_functions_part(array(
    'images',
    'menus',
    'widgets',
    'header-img', 
  ), 'functions/theme-support');


*/