PHPファイルアップロードプログレスバーの2つの実装方法のサンプルコード

if ($_SERVER['REQUEST_METHOD'] == 'POST') {  //上传请求  
    $status = apc_fetch('upload_' . $_POST['APC_UPLOAD_PROGRESS']);  
    $status['done'] = 1;  
    echo json_encode($status);  //输出给用户端页面里的ajax调用，相关文档请自己寻找  
    exit;  
} elseif (isset($_GET['progress_key'])) {   //读取上传进度  
    $status = apc_fetch('upload_'.$_GET['progress_key']);  
    echo json_encode($status);  
    exit;  
} else {  
    //其他代码，比如上传表单等  
}

if($_SERVER['REQUEST_METHOD']=='POST') {  
    if (is_uploaded_file($_FILES['upfile']['tmp_name'])) {  
        $upload_dir = 'your_path/';  
        $ext        = strrchr($_FILES['video']['name'], '.');  
        $sessid     = $_POST['UPLOAD_IDENTIFIER'] ;  
        $tmpfile    = $upload_dir . $sessid;   
        $sessfile   = $upload_dir . $sessid .$ext;  
        if (move_uploaded_file($_FILES['upfile']['tmp_name'],$tmpfile)) {  
            //上传成功  
        } else {  
            //上传失败  
    } else {  
        //上传错误  

} elseif (!empty($_GET['sessid'])) {  
    header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");  
    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");  
    header("Cache-Control: no-store, no-cache, must-revalidate");  
    header("Cache-Control: post-check=0, pre-check=0", false);  
    header("Pragma: no-cache");  
    header("Content-Type:text/html;charset=UTF-8");  

    $unique_id = $_GET['sessid'];  
    $uploadvalues = uploadprogress_get_info($unique_id);  

    if (is_array($uploadvalues)) {  
        echo json_encode($uploadvalues);  
    } else {  
        //读取进度失败，另外处理逻辑  
    }  

} else {  
    //显示上传表单  
}