PHP require file from top directory

Question

I have several subdomains contained in their own directory above my root site, and an assets folder in my root directory. For example:

/
/assets/
/forums/
/b         


        

Answer 1

• suppose you have pgm1.php in www.domain.com/dir1/dir2/dir3/pgm1.php, which include or require 'dirA/inc/Xpto.php'.
• and another pgm2.php in www.domain.com/dirZ1/dirZ2/pgm2.php, which include or require same 'dirA/inc/Xpto.php'.
• and your Host configuration not authorize require/include 'http://www.domain.com/......'

• So...you can use this, in both pgm1.php & pgm1.php, and REQUIRE or
  INCLUDE works !

  function rURI($p){
     for($w='',$i=1;$i<(count(explode('/',$_SERVER['PHP_SELF']))-1);$i++,$w.='../');return
     $w.$p; }
  

  require rURI('dirA/inc/Xpto.php'); // path from root