removing part of a string ?

Anon

I have a path string that shows the current working dir from where the script is executed ie.
"path=./some/dir/"
then I want the script to go to the parent dir, that could be don with this
"path=./some/dir/../"
but that isn't a good solution.
So what I need is something that removes, (in this example), "dir/" from the path string.
How do I do that ?
And then I also need to check if the first char., (or the first two), are "." or "./"
that I do with :
$get_path = substr($path, 0, 2);
$chk_path = strstr($get_path, "./");
if (!$chk_path) {
path = "./";
}

Sincerely

Brian Schmidt

Anon

Well if you want full control over how many levels you want to go down this might be a good way to handle it.

<?php
$path="./some/dir/";
$pathlist = split( "/", $path);

$drop = 2; //Drop down to level 2.
for($i=0;$i<count($pathlist)-$drop;$i++)
{
$newpath = $newpath.$pathlist[$i]."/";
}
echo $newpath;
?>

Because of the way the split function works the current level (./some/dir/) is $drop=1 and the level below that (./some/) is $drop=2 and so on.

There's probably a better way to do this but this was just a quick hack at it.

Anon

Nicely done Shaun.

A faster but less clean way would be to find the second-last slash, and take everything to the left of it.

$new_path = substr($old_path,0,strrpos($old_path,"/")+1);

Trivial problem: This works only providing your path does not end with a slash.

Anon

Well their's always a fix for that too, just do a check to see if the last char is a "/" then if it is then you can just truncate the string then perform the function as listed.

<?php
$path="./some/dir/";

if (strlen(strrchr('/',$path))==0)
$path = substr($path, 0, strlen($path)-1);

$pathlist = split( "/", $path);

$drop = 0; //Drop down one level.
for($i=0;$i<count($pathlist)-$drop;$i++)
{
$newpath = $newpath.$pathlist[$i]."/";
}
echo $newpath;
?>

I should have thought of this lastnight, but I guess I was too wasted.