如何获取PHP中不存在文件的规范化路径(realpath） - How to get canonicalized path (realpath) of nonexistent file in PHP?

How to get canonicalized path (realpath) of nonexistent file in PHP?

script.php

$filename = realpath(sprintf("%s/%s", getcwd(), $argv[1]));
var_dump($filename);

让我们试试

[/foo/bar/bof] $ php script.php ../foo.txt
string(16) "/foo/bar/foo.txt"
[/foo/bar/bof] $ php script.php ../nonexistent.txt
bool(false)

该死！realpath返回false，因为该文件不存在。

我想为../nonexistent.txt看到的是

string(24) "/foo/bar/nonexistent.txt"

如何获得PHP中任何相对路径的规范化路径

注意：我看到了一些关于解决符号链接路径的问题。这些问题的答案不适用于我的问题。

这是我能想到的最好的

function canonicalize_path($path, $cwd=null) {
  // don't prefix absolute paths
  if (substr($path, 0, 1) === "/") {
    $filename = $path;
  }
  // prefix relative path with $root
  else {
    $root      = is_null($cwd) ? getcwd() : $cwd;
    $filename  = sprintf("%s/%s", $root, $path);
  }
  // get realpath of dirname
  $dirname   = dirname($filename);
  $canonical = realpath($dirname);
  // trigger error if $dirname is nonexistent
  if ($canonical === false) {
    trigger_error(sprintf("Directory `%s' does not exist", $dirname), E_USER_ERROR);
  }
  // prevent double slash "//" below
  if ($canonical === "/") $canonical = null;
  // return canonicalized path
  return sprintf("%s/%s", $canonical, basename($filename));
}

它要求路径中的所有目录都存在。路径的basename是唯一不存在的部分。

如果目录名不存在，将引发错误。

我创建了这个：

$path_canonicalize = function($str, $started = false) use(&$path_canonicalize)
{
    $str = str_replace('/', DIRECTORY_SEPARATOR, $str).DIRECTORY_SEPARATOR;
    if (!$started)
        $str = preg_replace("/".preg_quote(DIRECTORY_SEPARATOR, "'".DIRECTORY_SEPARATOR."'")."{2,}/", DIRECTORY_SEPARATOR, $str);
    $pos = strpos($str, '..'.DIRECTORY_SEPARATOR);
    if ($pos !== false)
    {
        $part = trim(substr($str, 0, $pos), DIRECTORY_SEPARATOR);
        $str = $path_canonicalize(trim(substr($part, 0, strrpos($part, DIRECTORY_SEPARATOR)), DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR.trim(substr($str, $pos+3), DIRECTORY_SEPARATOR), true);
    }
    return rtrim($str, DIRECTORY_SEPARATOR);
};
/*
Try those cases to check the consistency:
$str = __DIR__.'/template//////../header//..';
$str = __DIR__.'/template///..///../header//..';
$str = __DIR__.'/template/../header/..';
$str = __DIR__.'/template/../header/../';
$str = __DIR__.'/template/../header/..//';
$str = __DIR__.'/template/../header/..///';
$str = __DIR__.'/template/../header/..///..';
$str = __DIR__.'/template/../header/..///../';
$str = __DIR__.'/template''..''header''..';
*/
$str = __DIR__.'/template/../header/..///..//';
echo 'original: '.$str.PHP_EOL;
echo 'normalized: '.$path_canonicalize($str).PHP_EOL;

一些问题：

例程不检查给定路径是相对路径还是绝对路径
建议告知绝对路径，但也适用于相对路径。例程将所有内容都视为字符串，而不是文件系统
最终结果将删除字符串开头和结尾的目录分隔符
不支持单点./或/.