PHP code A PHP code to find the relative path of $b relative to $a

php interview question:
$a = '/a/b/c/d/e.php'; $b = '/a/b/12/34/c.php'; //Calculate $b The relative path relative to $a should be ../../c/d
Answer to the php interview question:

Copy the code The code is as follows:

function getRelative($a,$b) {
$arr = explode("/",$a);
$brr = explode("/",$b);
$c = count($arr)-2;
$d = count($brr)-2 ;
//The reason for subtracting two is that one is the file name that is not behind,
//The other is that the index of the array starts from 0, which is one less than the number of the first dimension in the array
$e = ($ c>$d) ? $c:$d;
$str1 = $str2 = '';
for ($j=0;$j<=$e;$j++) {
$cur_a = isset($arr[ $j]) ? $arr[$j] : '';
$cur_b = isset($brr[$j]) ? $brr[$j] : '';
if ($cur_a == $cur_b) {
continue;
} else {
if ($j <= $c)
{
$str1.='/'.$cur_a;
}
if ($j <= $d )
{
$str2 .="../";
}
}
}
return $str2.substr($str1,1,strlen($str1));
}

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