/*
*计算两个文件相对路径
*/
function relative_path($path1,$path2) {
$arr1 = explode(‘/‘,dirname($path1));
$arr2 = explode(‘/‘,dirname($path2));
for($i=0,$len = count($arr2);$i < $len;$i++) {
if($arr1[$i] != $arr2[$i]) {
break;
}
#不在同一个根目录下
var_dump($len - $i);
if($i == 1) {
$return_path = array();
}
#在同一个根目录下
if($i != 1 && $i < $len) {
$return_path = array_fill(0,$len - $i,"..");
}
#在同一个目录下
if($i == $len) {
$return_path = array(‘./‘);
}
$return_path = array_merge($return_path,array_slice($arr1, $i));
return implode(‘/‘, $return_path);
}
}
$a = ‘/a/b/c/d/e.php‘;
$b = ‘/a/b/12/34/c.php‘;
$c = ‘/e/b/c/d/f.php‘;
$d = ‘/a/b/c/d/g.php‘;
relative_path($a,$b);
//echo relative_path($a,$b);// ../../../../..//a/b/c/d
echo "<br/>";
//echo relative_path($a,$c);// ../../../../..//a/b/c/d
echo "<br/>";
//echo relative_path($a,$d);// ../../../../..//a/b/c/d
echo "<br/>";