Replace PHP's realpath()

Question

Apparently, realpath is very buggy. In PHP 5.3.1, it causes random crashes. In 5.3.0 and less, realpath randomly fails and returns false (for the s

Answer 1

here is the modified code that supports UNC paths as well

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;
}