redirect - php file_get_contents, location redirection

I use the sme_block script for IP blocking on my website. The script takes the IP list from block_this.txt. However, this only works if block_this.txt is in the same directory. How to make php files from other directories access block_this.txt? Because uploading the same block_this.txt to every directory is too time consuming, list is updated often and website has many directories. Same problem with redirecting for blocked IPs (location:).

function smeblock($a)
{
    $temps=file_get_contents("block_this.txt");
    
    $cts = explode("|", $temps);
    foreach ($cts as $ctsc)
      {
    $ctsc = trim($ctsc);
    $word = preg_quote($ctsc, '#');
    $pattern = "#$word#i"; 
    if ( preg_match($pattern, $a) )
      {
    header('Location:https://www.google.com');    die();
      }
      }
}

Solution:

You could provide the absolute path to blocklist, e.g.

function smeblock($a)
{
    $temps = file_get_contents("/var/www/html/block_this.txt");
//...
}

or define the path as a global constant:

const PATH_TO_BLOCKLIST = '/var/www/html/block_this.txt';
function smeblock($a)
{
    $temps = file_get_contents(PATH_TO_BLOCKLIST);
//...
}