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Path.php
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Path.php
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<?php
/**
* @link https://craftcms.com/
* @copyright Copyright (c) Pixel & Tonic, Inc.
* @license https://craftcms.github.io/license/
*/
namespace craft\helpers;
/**
* Class Path
*
* @author Pixel & Tonic, Inc. <support@pixelandtonic.com>
* @since 3.0.0
*/
class Path
{
/**
* Ensures that a relative path never goes deeper than its root directory.
*
* @param string $path
* @return bool
*/
public static function ensurePathIsContained(string $path): bool
{
// Sanitize
$path = StringHelper::convertToUtf8($path);
$segs = ArrayHelper::filterEmptyStringsFromArray(preg_split('/[\\/\\\\]/', $path));
$level = 0;
foreach ($segs as $seg) {
if ($seg === '..') {
$level--;
} elseif ($seg !== '.') {
$level++;
}
if ($level < 0) {
return false;
}
}
return true;
}
}