How to hide a button in a specific page?

Question

PHP

How to hide a button in a certain page so that it is not shown on the main page but is shown on others?

Here is the code of the Button it needs to be hidden in the index.php page

<?php if($_SERVER['document_url']=='/index.php' && empty($_SERVER['QUERY_STRING'])){ }else{ echo '<button type="button" class="btn btn-link" onclick="history.back()"><i class="glyphicon glyphicon-arrow-left"></i><span>Назад</span></button>';}?>

Answer 1

//echo '<pre>';print_r($_SERVER);echo '</pre>';
if((empty($_SERVER['DOCUMENT_URI']) || $_SERVER['DOCUMENT_URI']=='/index.php')&&
  empty($_SERVER['QUERY_STRING'])){
}else{
  echo '<button type="button" class="btn btn-link" onclick="history.back()">
  <i class="glyphicon	glyphicon-arrow-left"></i><span>Назад</span></button>';
}

Answer 2

if(window.location.pathname == '/') {
   // hide button
 }

Answer 3

if( window.location.pathname == undefined ||  window.location.pathname == '/') {
   $( 'button' ).hide();
};

Answer 4

Here is the button code

<button type="button" class="btn btn-link" onclick="history.back()"><i class="glyphicon glyphicon-arrow-left"></i><span>Назад</span></button>