Php meta taga in single header page.php

<?php

$base="";
include "";

$page = $_SERVER['PHP_SELF'];
   
switch ($page){

case "/index.php":
 $title= ' Lorem Ipsum placeholder text for use in your graphic';
 $description = ' Lorem Ipsum placeholder text for use in your graphic';
$kyeword=' Lorem Ipsum placeholder text for use in your graphic';
 break;

case "/about-us.php";
 $title= ' Lorem Ipsum placeholder text for use in your graphic';
 $description = ' Lorem Ipsum placeholder text for use in your graphic';
$kyeword=' Lorem Ipsum placeholder text for use in your graphic';
break;

}

?>