<?php
/**
* Normalise a path, resolving empty, . and .. components, optionally against another path
*
* @param string $path
* @param string $target
* @return string
*/
function resolve_path($path, $relativeBase = null)
{
// Find separator in use and determine whether output path should be absolute
$separator = strpos($path, '\\') !== false || strpos($relativeBase, '\\') !== false ? '\\' : '/';
$isAbsolute = (!isset($relativeBase) && ($path[0] === '/' || $path[0] === '\\'))
|| (isset($relativeBase) && ($relativeBase[0] === '/' || $relativeBase[0] === '\\'));
// Create the base output array
$target = $relativeBase !== null ? preg_split('#[\\\\/]+#', $relativeBase, -1, PREG_SPLIT_NO_EMPTY) : [];
// Strip empty components and resolve . and ..
foreach (preg_split('#[\\\\/]+#', $path, -1, PREG_SPLIT_NO_EMPTY) as $component) {
switch ($component) {
case '.': // current directory - do nothing
break;
case '..': // up a level
array_pop($target);
break;
default:
$target[] = $component;
break;
}
}
// Add a trailing empty element if path refers to a directory
$lastChar = $path[strlen($path) - 1];
if ($lastChar === '/' || $lastChar === '\\') {
$target[] = '';
}
// Add a leading slash if path is absolute
if ($isAbsolute) {
array_unshift($target, $separator);
}
return implode($separator, $target);
}
$tests = [
'/foo/bar/./../baz' => '',
];
foreach ($tests as $path => $base) {
$result = resolve_path($path, $base);
echo "
Path: $path
Base: $base
Result: $result
";
}
preferences:
38.73 ms | 402 KiB | 5 Q