<?php
    ini_set('display_errors',1); // enable php error display for easy trouble shooting
    error_reporting(E_ALL); // set error display to all
    DEFINE ('_BASEFOLDER_', 'folder');
    DEFINE ('_TMPFOLDER_','folder/_tmp');

    function clearTmpFolder() {
        if (!file_exists(_TMPFOLDER_)) {
            mkdir(_TMPFOLDER_);
        } else {
            foreach (GLOB(_TMPFOLDER_ . '/*') as $files) {
                if (!unlink($files)) {
                die('Unable to clear tmp folder. Please check folder permission');
                }
            }
        }
    }

    if (isset($_POST['folder'])) {
        if (!file_exists(_BASEFOLDER_)) {
            mkdir(_BASEFOLDER_);
        }
        if (isset($_FILES['project'])) {
            $file_path = _TMPFOLDER_ . '/temp.zip';
            clearTmpFolder();
            if (move_uploaded_file($_FILES['project']['tmp_name'], $file_path)) {
                $zip = new ZipArchive;
                if ($zip->open($file_path) === TRUE) {
                    $newfolder = 'folder/' . $_POST['folder'] . '_'. microtime();
                    mkdir($newfolder);
                    $zip->extractTo($newfolder);
                    $zip->close();
                    clearTmpFolder();
                } else {
                    echo 'Fail to open zip file. File may be corrupted';
                }
            }
        }
    }

?>

<form action="" method="POST" enctype="multipart/form-data">
    <input type="file" name="project" accept=".zip">
    <input type="hidden" name="folder" value="project">
    <input type="submit" name="submit" value="submit">
</form>