获取使用PHP5传输的字节用于POST请求

时间:2017-02-26 10:00:00

标签: javascript php post http-post

注意我是PHP,Apache和服务器编程的新手,因此我们将不胜感激。

上下文

我在javascript中创建了一个进度条,用于在上传文件时显示。当前我以设定的帧速率更新进度条(以查看它是否有效)。

显然,为了使其成为一个准确的进度条,一切都应该与传输的字节数相比,与总字节数相比较。

问题

使用PHP5如何获取有关与文件总字节数相关的传输字节数的信息,以便我可以将其传递给JS函数updateProgress(bytesSoFar, totalBytes)来更新我的进度条?请详细告诉我下面代码所需的修改,以使其工作。我看过xhr个例子,但它们无法完全访问。

我刚刚设置了LocalHost并正在使用W3Schools的PHP File Upload教程。为了使模拟的“上传”工作,我改变了本S.O中建议的本地权限。 post。我不一定需要读取文件,我只想知道已经传输了很多字节。

代码

目前我有两个文件:

  • 的index.php

  • upload.php的

的index.php

<!DOCTYPE html>
<html>
<body>

<form action="upload.php" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Image" name="submit">
</form>

</body>
</html>

upload.php的

<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
?>

更新

我找到了这段代码:

test.php的

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST" && !empty($_FILES["userfile"])) {



  // move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)
move_uploaded_file($_FILES["userfile"]["tmp_name"], "uploads/" . $_FILES["userfile"]["name"]);
}
?>
<html>
<head>
  <title>File Upload Progress Bar</title>
  <style type="text/css">
    #bar_blank {
    border: solid 1px #000;
    height: 20px;
    width: 300px;
    }

    #bar_color {
    background-color: #006666;
    height: 20px;
    width: 0px;
    }

    #bar_blank, #hidden_iframe {
    display: none;
    }
  </style>
</head>
<body>

  <div id="bar_blank">
    <div id="bar_color"></div>
  </div>
  <div id="status"></div>

  <form action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="POST" id="myForm" enctype="multipart/form-data" target="hidden_iframe">
    <input type="hidden" value="myForm" name="<?php echo ini_get("session.upload_progress.name"); ?>">
    <input type="file" name="userfile"><br>
    <input type="submit" value="Start Upload">
  </form>

  <script type="text/javascript">
    function toggleBarVisibility() {
      var e = document.getElementById("bar_blank");
      e.style.display = (e.style.display == "block") ? "none" : "block";
    }

    function createRequestObject() {
      var http;
      if (navigator.appName == "Microsoft Internet Explorer") {
        http = new ActiveXObject("Microsoft.XMLHTTP");
      }
      else {
        http = new XMLHttpRequest();
      }
      return http;
    }

    function sendRequest() {
      var http = createRequestObject();
      http.open("GET", "progress.php");
      http.onreadystatechange = function () { handleResponse(http); };
      http.send(null);
    }

    function handleResponse(http) {
      var response;
      if (http.readyState == 4) {
        response = http.responseText;

        document.getElementById("bar_color").style.width = response + "%";
        document.getElementById("status").innerHTML = response + "%";

        if (response < 100) {
          setTimeout("sendRequest()", 1000);
        }
        else {
          toggleBarVisibility();
          document.getElementById("status").innerHTML = "Done.";
        }
      }
    }

    function startUpload() {
      toggleBarVisibility();
      setTimeout("sendRequest()", 1000);
    }

    (function () {
      document.getElementById("myForm").onsubmit = startUpload;
    })();
  </script>
</body>
</html>

progress.php

session_start();

$key = ini_get("session.upload_progress.prefix") . "myForm";
if (!empty($_SESSION[$key])) {
  $current = $_SESSION[$key]["bytes_processed"];
  $total = $_SESSION[$key]["content_length"];
  echo $current < $total ? ceil($current / $total * 100) : 100;

  $message = ceil($current / $total * 100) : 100;

  $message = "$message"
  echo "<script type='text/javascript'>alert('$message');</script>";
}
else {
  echo 100;
}
?>

与我之前的代码一样,传输文件。但是,直到结束时才会显示字节(即使它应该提醒它),它也会打开一个带有“完成”的新窗口。上一个窗口中的陈述。

2 个答案:

答案 0 :(得分:4)

如果您坚持使用Php来显示进度,可以查看此Php File Upload Progress Bar,这可能有助于您入门。这使用PECL扩展APC来获取上载的文件进度详细信息。可以使用响应来计算服务器接收的字节数 根据第一个链接 apc_fetch()

另一个有趣的Track Upload Progress教程,它使用了Php的原生Session Upload Progress功能。

最后,如果您对使用Javascript(或JS库)有点开放,那将是理想。我知道的一个易于使用,易于设置,众所周知和维护的库是FineUploader

答案 1 :(得分:1)

您可以使用Session Upload Progress功能。它是原生的,但需要一些php.ini配置。

请查看PHP manual

更新1

注意,您无需更改upload.php。您可以创建一个新的php文件(例如progress.php)并向他们发出请求,以检查您的JS上传进度。

<强> progress.php

<?php
$upload_id = $_GET['upload_id];
print json_encode($_SESSION['upload_progress_'.$upload_id]);

然后你的JS会向progress.php?upload_id=YourIdValue发出GET请求,你会收到一个包含所有进度信息的JSON。