PHP function calculates the relative path of two files

Sina has an interview topic: Write a PHP function to calculate the relative path of two files? PHP//Calculate the relative path of c.php relative to e.php should be ... /.. /12/34 $a =/a/b/c/d/e.php; $b =/a/b/12/34/c.php; GetPathInfo ($a, $b); function GetPathInfo ($a, $b) {$a

Sina has an interview topic: Write a PHP function to calculate the relative path of two files

　　

Calculating the relative path of c.php relative to e.php should be ... /.. /12/34

$a = '/a/b/c/d/e.php ';

$b = '/a/b/12/34/c.php ';

GetPathInfo ($a, $b);

function GetPathInfo ($a, $b) {

$a 2array = explode ('/', $a);

$b 2array = explode ('/', $b);

$pathinfo = ';

for ($i = 1; $i <= count ($b 2array)-2; $i + +) {

$pathinfo. = $a 2array[$i] = = $b 2array[$i]? '.. /': $b 2array[$i]. ' /';

}

Print_r ($pathinfo);

}

?>

There's a more complicated approach. It's not perfect. Thinking is right can be studied

　　

$a = ' aa/bb/cc/dd/a.php ';

$b = ' aa/bb/11/22/33/b.php ';

Write a function that counts the relative paths of two files.

function Getnum ($variant, $variant 2) {

$pth 1 = null;

$pth 2 = null;

$tmp = Array ();

Separately determine if the path below the file is not present.

if (Is_file ($variant) && is_file ($variant 2)) {

$len 1 = count ($pth 1 = explode ('/', dirname ($variant)));

$len 2 = count ($pth 2 = explode ('/', DirName ($variant 2)));

$maxlen = max ($len 1, $len 2);

for ($i =1; $i < $maxlen; $i + +) {

if ($pth 1[$i]!= $pth 2[$i] && isset ($pth 1[$i])) {

if (Isset ($pth 2[$i])) $tmp [] = $pth 2[$i];

}else{

$tmp [] = $pth 2[$i];

$pathe. = '.. /';

}

}

Return $pathe. Implode ('/', $tmp). ' /'. BaseName ($variant 2);

}else{

Return ' path illegal! '

}

}

Print_r (Getnum ($a, $b));

?>