[SOLVED] Cleaning up path with php

[ivalmian]

Hi,

 

I'm writing a file manager for a school org I'm in. My question is this, currently, when I have someone navigate through directories and they want to go one up I simply append ../ to the directory path. Since this is done in a series of places and it is fairly convenient, I don't think I'm going to change this. The problem, however, is that after some browsing you end up with a path along the lines of "../dev/sample1/../sample2/../sample3/../" instead of simply "../dev/". This becomes very problematic if one of the folders I've previously browsed was deleted (in which case the whole algorithm breaks). What I need to do is create a function that would take in the currentpath $curpath (which can be ugly and long) and spit out the optimized path (so, to return back to my example, I want to be able to pass the function "../dev/sample1/../sample2/../sample3/../" and have it return "../dev/"). I tried to make an algorithm by splitting the path by split($curpath,"/") and then removing parts of the array that precede ".." but it doesn't really work.

 

Hope you can help me,

Thank you in advance,

 

Ilya V

 

[sasa]

try

<?php
$a = '../dev/sample1/../sample2/../sample3/../';
$a = explode('/',$a);
$count = count($a);
for ($i = 1; $i < $count; $i++) {
if ($a[$i] == '..') {
	unset($a[$i]);
	unset($a[$i - 1]);
}
}
echo $a = implode('/',$a);
?>

or

<?php
function opti_path($path, $is_opti = false) {
if ($is_opti) return $path;
$path = explode('/',$path);
$count = count($path);
$is_opti = true;
for ($i = 1; $i < $count; $i++) {
	if ($path[$i] == '..') {
		if (isset($path[$i-1])) {
			unset($path[$i]);
			unset($path[$i - 1]);
			$is_opti = false;
		}
	}
}
return opti_path(implode('/',$path), $is_opti);
}


$a = '../dev/sample1/../../sample2/../sample3/';

echo opti_path($a);
?>

[TreeNode]

It seems as if the solution is more in re-writing how you define the current working directory while you navigate instead of parsing out the required information every time. Maybe you could just keep a record (variable) of the current working directory alongside the ridiculous path string you are building? Just some ideas.

[ivalmian]

I actually like sasa's solution and will try to implement it...

[ivalmian]

Ok, while you still get some problems, the solution is actually pretty nice. Thank you, topic solved.

 

I used, based on sasa's suggestion:

function OptimizeCurpath($curpath){
$a=$curpath;
$a = explode('/',$a);
$count = count($a);
for ($i = 1; $i < $count; $i++) {
if ($a[$i] == '..' && $a[$i-1]!='..') {
	unset($a[$i]);
	unset($a[$i - 1]);
}
}
$a=implode('/',$a);
return $a;
}

[sasa]

this solution don't work 100%

if you have in path part '/../../' (two directory up) optimized path is wrong

look

<?php
function OptimizeCurpath($curpath){
$a=$curpath;
$a = explode('/',$a);
$count = count($a);
for ($i = 1; $i < $count; $i++) {
if ($a[$i] == '..' && $a[$i-1]!='..') {
	unset($a[$i]);
	unset($a[$i - 1]);
}
}
$a=implode('/',$a);
return $a;
}

function OptimizeCurpath1($curpath){
$x = '';
while (($curpath = preg_replace('/\/[^\/\.]+\/\.\.\//','/',$curpath)) != $x) $x = $curpath;
return $curpath;
}

function opti_path($path, $is_opti = false) {
if ($is_opti) return $path;
$path = explode('/',$path);
$count = count($path);
$is_opti = true;
for ($i = 1; $i < $count; $i++) {
	if ($path[$i] == '..') {
		if (isset($path[$i-1])) {
			unset($path[$i]);
			unset($path[$i - 1]);
			$is_opti = false;
		}
	}
}
return opti_path(implode('/',$path), $is_opti);
}

$a = '../dev/sample1/../sample2/subsample2_1/../../sample3/../';

echo OptimizeCurpath($a);

echo "\n<hr />\n";

echo opti_path($a);

echo "\n<hr />\n";

echo OptimizeCurpath1($a);

?>

you can see 3th possibility for do that