<?php
namespace MockingMagician\Organic\Helper;
class Path
{
 /**
 * There is a method that deal with Sven Arduwie proposal https://www.php.net/manual/en/function.realpath.php#84012
 * And runeimp at gmail dot com proposal https://www.php.net/manual/en/function.realpath.php#112367
 * @param string $path
 * @return string
 */
 public static function getAbsolute(string $path): string
 {
 // Cleaning path regarding OS
 $path = mb_ereg_replace('\\\\|/', DIRECTORY_SEPARATOR, $path, 'msr');
 // Check if path start with a separator (UNIX)
 $startWithSeparator = $path[0] === DIRECTORY_SEPARATOR;
 // Check if start with drive letter
 preg_match('/^[a-z]:/', $path, $matches);
 $startWithLetterDir = isset($matches[0]) ? $matches[0] : false;
 // Get and filter empty sub paths
 $subPaths = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'mb_strlen');
 $absolutes = [];
 foreach ($subPaths as $subPath) {
 if ('.' === $subPath) {
 continue;
 }
 // if $startWithSeparator is false
 // and $startWithLetterDir
 // and (absolutes is empty or all previous values are ..)
 // save absolute cause that's a relative and we can't deal with that and just forget that we want go up
 if ('..' === $subPath
 && !$startWithSeparator
 && !$startWithLetterDir
 && empty(array_filter($absolutes, function ($value) { return !('..' === $value); }))
 ) {
 $absolutes[] = $subPath;
 continue;
 }
 if ('..' === $subPath) {
 array_pop($absolutes);
 continue;
 }
 $absolutes[] = $subPath;
 }
 return
 (($startWithSeparator ? DIRECTORY_SEPARATOR : $startWithLetterDir) ?
 $startWithLetterDir.DIRECTORY_SEPARATOR : ''
 ).implode(DIRECTORY_SEPARATOR, $absolutes);
 }
 /**
 * Examples
 *
 * echo Path::getAbsolute('/one/two/../two/./three/../../two'); => /one/two
 * echo Path::getAbsolute('../one/two/../two/./three/../../two'); => ../one/two
 * echo Path::getAbsolute('../.././../one/two/../two/./three/../../two'); => ../../../one/two
 * echo Path::getAbsolute('../././../one/two/../two/./three/../../two'); => ../../one/two
 * echo Path::getAbsolute('/../one/two/../two/./three/../../two'); => /one/two
 * echo Path::getAbsolute('/../../one/two/../two/./three/../../two'); => /one/two
 * echo Path::getAbsolute('c:\.\..\one\two\..\two\.\three\..\..\two'); => c:/one/two
 *
 */
}