PHP Gets the relative path instance code

PHP Tutorial Get the relative Path instance code

function Getrelativepath ($a, $b) {
$returnPath = Array (dirname ($b));
$arrA = explode ('/', $a);
$arrB = explode ('/', $returnPath [0]);

    for ($n = 1, $len = count ($arrB), $n < $len; $n + +) {  
         if ($arrA [$n]!= $arrB [$n]) {  
             break;  
       }   
   }  
    if ($len-$n > 0) {  
         $returnPath = Array_merge ($returnPath, Array_fill (1, $len-$n, ' ... '));   
   }  
      
    $ Returnpath = Array_merge ($returnPath, Array_slice ($arrA, $n));  
    return implode ('/', $returnPath);  
}  
Var_dump (Getrelativepath ($a, $b);

Method Two
$a = "/a/b/c/d/index.php";
Echo basename ($a, '. php ');//Return the file name part of the path
echo dirname ($a);
$b = "/a/b/12/34/index2.php";

function Getrelativepath ($path 1, $path 2) {
$p 1 = dirname ($path 1);
$p 2 = dirname ($path 2);

$arr 1 = explode ('/', $p 1);
$arr 2 = explode ('/', $p 2);

    $diff _arr= Array_diff ($arr 2, $arr 1);   //calculation difference set notice who's here versus who's
     $inter _arr = Array_intersect ($arr 1, $arr 2);//Compute intersection
   
    $leng = count ($ Inter_arr);   //length is based on intersection. Section
    for ($i =1 $i < $leng $i + +) {
        $inter _arr[$i ] = '..';    
   }
   
    $merge _arr = Array_merge ($ Inter_arr, $diff _arr);
    $fina _arr = implode ('/', $merge _arr);
    return $fina _arr;
}
Var_dump (Getrelativepath ($a, $b));
//return string '/... /.. /12/34 ' (length=12)
//If changed to $diff_arr= Array_diff ($arr 1, $arr 2), return string '/... /.. /C/D (length=12)