hameedullah

You need to remove the space between PHP tags. The best thing is to not close the php tags at all.

Below is how your functions.php should look like:

<?php
// php tag start here and it does not close

add_theme_support('post-thumbnails');

function new_excerpt_length($length) {
return 55;
}
add_filter('excerpt_length', 'new_excerpt_length');

function new_excerpt_more($more) {
global $post;
return 'ID) . '">[ادامه]';
}
add_filter('excerpt_more', 'new_excerpt_more');
// no closing php tag