Mikhail Osher

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document.querySelector('body').classList.add('className');

<?php

$uri = 'http://maps.tut.by/?x=27.5754888&y=53.8710542&zoom=15';
parse_str(parse_url($uri, PHP_URL_QUERY), $query);

var_dump($query);

array(3) {
  'x' =>
  string(10) "27.5754888"
  'y' =>
  string(10) "53.8710542"
  'zoom' =>
  string(2) "15"
}