PHP 7.0.6 Released

    User Contributed Notes

    Guilherme Garnier
    10 years ago
    I noticed that, differently from Unix ln command, the second parameter can´t be a directory name, i.e., if you want to create a link with the same filename of the target file (obviously on different directories), you must specify the filename on the link parameter.

    Example:
    Unix ln command:
    ln /dir1/file /dir2/   // ok, creates /dir2/file link

    PHP link function:
    link ("/dir1/file", "/dir2/");   // wrong, gives a "File exists" warning
    link ("/dir1/file", "/dir2/file");   // ok, creates /dir2/file link
    Anonymous
    6 years ago
    to clarify:

    in unix/linux:
    hardlinks (by this function) cannot go across different filesystems.
    softlinks can point anywhere.

    in linux, hardlinking to directory is not permited.
    Jasper Bekkers
    9 years ago
    For a backup utility I needed link-like functionality on a windows system. As it isn't availible on windows, i tried to do it myself with the help of some tools. All you need is junction.exe from sysinternals in your %PATH%.

    <?php
    if(!function_exists('link')){ // Assume a windows system
            function link($target, $link){
            if(    is_dir($target)){
                    // junctions link to directories in windows
                    exec("junction $link $target", $lines, $val);
                return     0 == $val;
            }elseif(    is_file($target)){
                    // Hardlinks link to files in windows
                    exec("fsutil hardlink create $link $target", $lines, $val);
                return     0 == $val;
            }
           
            return     false;
        }
    }
    ?>

    http://www.sysinternals.com/Utilities/Junction.html
    stephane AT baladeauboutdumonde DOT com
    8 years ago
    Make link recursively :
    <?php
    function makeRecusLink($orig, $dest)
    {
        if (    is_dir($orig)) {
            if (    substr($orig, -1) != '/') {
                    $orig .= '/';
            }

                $handle = opendir($orig);

            while (    false !== ($file = readdir($handle))) {
                if (    $file != '.' && $file != '..') {
                        $path = $orig.$file;

                    if (    is_file($path)) {
                        @    link($path, $dest.'/'.$file);
                    } else if (    is_dir($path)) {
                        @    mkdir($dest.'/'.$file, 0755);                   
                            makeRecusLink($path, $dest.'/'.$file);
                    }
                }
            }
        }
       
            closedir($handle);
    }
    ?>
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