Find the relative paths of two directories

Find the relative paths of two directories without limiting the path depth

/**

 * Output the relative path of $b relative to $a ($a)

 * No limit on path depth, no optimization, just implementation of the function

*/

function getPath($a, $b)

{

 $aArr = explode('/', dirname($a));

 $bArr = explode ('/', dirname($b));



 $aLen = count($aArr);

 $bLen = count($bArr);



 $len = max($aLen, $bLen );



 $k = 0;



 for($i = 0; $i < $len; $i++)

 {

 if($k == 0)

 {

 if(isset($aArr[$i]) && ($aArr[$i] != $bArr[$i]))

 {

 $d .= '../';



 if( isset($bArr[$i]))

 {

 $nP[$i] = $bArr[$i];

 }



 $k = $k + 1;

 }

 }

 else

 {

 if(isset($aArr[$i]))

 {

 $d .= '../';

 }

 if(isset($bArr[$i] ))

 {

 $nP[$i] = $bArr[$i];

 }

 }

 }



 echo $d.implode('/', $nP);

 }