替换PHP的realpath()

多亏了斯文·阿杜威的密码( pointed out by Pekka )还有一些修改,我已经(希望)构建了一个更好的实现:

/**
 * This function is to replace PHP's extremely buggy realpath().
 * @param string The original path, can be relative etc.
 * @return string The resolved path, it might not exist.
 */
function truepath($path){
    // whether $path is unix or not
    $unipath=strlen($path)==0 || $path{0}!='/';
    // attempts to detect if path is relative in which case, add cwd
    if(strpos($path,':')===false && $unipath)
        $path=getcwd().DIRECTORY_SEPARATOR.$path;
    // resolve path parts (single dot, double dot and double delimiters)
    $path = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $path);
    $parts = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'strlen');
    $absolutes = array();
    foreach ($parts as $part) {
        if ('.'  == $part) continue;
        if ('..' == $part) {
            array_pop($absolutes);
        } else {
            $absolutes[] = $part;
        }
    }
    $path=implode(DIRECTORY_SEPARATOR, $absolutes);
    // resolve any symlinks
    if(file_exists($path) && linkinfo($path)>0)$path=readlink($path);
    // put initial separator that could have been lost
    $path=!$unipath ? '/'.$path : $path;
    return $path;
}

注: 不像PHP realpath

注2: 显然有些人不能正确阅读。Truepath()在网络资源(包括UNC和URL)上不起作用。

下面是支持UNC路径的修改代码

static public function truepath($path)
{
    // whether $path is unix or not
    $unipath = strlen($path)==0 || $path{0}!='/';
    $unc = substr($path,0,2)=='\\\\'?true:false;
    // attempts to detect if path is relative in which case, add cwd
    if(strpos($path,':') === false && $unipath && !$unc){
        $path=getcwd().DIRECTORY_SEPARATOR.$path;
        if($path{0}=='/'){
            $unipath = false;
        }
    }

    // resolve path parts (single dot, double dot and double delimiters)
    $path = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $path);
    $parts = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'strlen');
    $absolutes = array();
    foreach ($parts as $part) {
        if ('.'  == $part){
            continue;
        }
        if ('..' == $part) {
            array_pop($absolutes);
        } else {
            $absolutes[] = $part;
        }
    }
    $path = implode(DIRECTORY_SEPARATOR, $absolutes);
    // resolve any symlinks
    if( function_exists('readlink') && file_exists($path) && linkinfo($path)>0 ){
        $path = readlink($path);
    }
    // put initial separator that could have been lost
    $path = !$unipath ? '/'.$path : $path;
    $path = $unc ? '\\\\'.$path : $path;
    return $path;
}

$path = APPLICATION_PATH . "/../directory";
$realpath = new Zend_Filter_RealPath(new Zend_Config(array('exists' => false)));
$realpath = $realpath->filter($path);

我从没听说过 realpath() (我一直认为它只是接口一些底层操作系统功能-可能会对一些链接感兴趣),但是 User Contributed Notes 到手册页有许多可供选择的实现。 Here

当然,并不能保证这些实现会处理所有跨平台的怪癖和问题,所以您必须进行彻底的测试,看看它是否适合您的需要。

据我所见,它们都不返回规范化的路径,它们只解析相对路径。如果你需要的话,我不确定你是否能出去 realpath()

我知道这是一个老线索,但它真的很有帮助。

Phar::interceptFileFuncs 当我在中实现相对路径时出现问题 phpctags realpath() 是真正的车内法尔。

谢谢这个线程给我一些提示,下面是我基于 christian comments .

希望对你有用。

function relativePath($from, $to)
{
    $fromPath = absolutePath($from);
    $toPath = absolutePath($to);

    $fromPathParts = explode(DIRECTORY_SEPARATOR, rtrim($fromPath, DIRECTORY_SEPARATOR));
    $toPathParts = explode(DIRECTORY_SEPARATOR, rtrim($toPath, DIRECTORY_SEPARATOR));
    while(count($fromPathParts) && count($toPathParts) && ($fromPathParts[0] == $toPathParts[0]))
    {
        array_shift($fromPathParts);
        array_shift($toPathParts);
    }
    return str_pad("", count($fromPathParts)*3, '..'.DIRECTORY_SEPARATOR).implode(DIRECTORY_SEPARATOR, $toPathParts);
}

function absolutePath($path)
{
    $isEmptyPath    = (strlen($path) == 0);
    $isRelativePath = ($path{0} != '/');
    $isWindowsPath  = !(strpos($path, ':') === false);

    if (($isEmptyPath || $isRelativePath) && !$isWindowsPath)
        $path= getcwd().DIRECTORY_SEPARATOR.$path;

    // resolve path parts (single dot, double dot and double delimiters)
    $path = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $path);
    $pathParts = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'strlen');
    $absolutePathParts = array();
    foreach ($pathParts as $part) {
        if ($part == '.')
            continue;

        if ($part == '..') {
            array_pop($absolutePathParts);
        } else {
            $absolutePathParts[] = $part;
        }
    }
    $path = implode(DIRECTORY_SEPARATOR, $absolutePathParts);

    // resolve any symlinks
    if (file_exists($path) && linkinfo($path)>0)
        $path = readlink($path);

    // put initial separator that could have been lost
    $path= (!$isWindowsPath ? '/'.$path : $path);

    return $path;
}

问题不在于这个函数,而在于getcwd在Linux中返回什么。