请注意，我是PHP，Apache和服务器编程的新手，因此请您提供更详尽的解释。
我在JavaScript中创建了一个进度条，以在文件上传时显示。当前，我以设定的帧速率更新进度条（以查看其是否有效）。
显然，为了使它成为一个准确的进度条，所有内容都应与传输的字节数和总字节数有关。
使用PHP5，如何获取有关传输的字节数（相对于文件的总字节数）的信息，以便可以将其传递给JS函数updateProgress(bytesSoFar, totalBytes)以更新进度条？请详尽地引导我完成下面的代码所需的修改，以使其正常工作。我已经看到了xhr示例，但是并不能完全访问它们。
我刚刚设置了LocalHost，并且正在使用W3Schools的PHP File Upload教程。为了让模拟的'上传'工作，我改变了本地权限在本SO建议后。我不一定需要读取文件，我只想知道已经传输了许多字节。
目前，我有两个文件：
index.php
upload.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>
<?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( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
} else {
echo "Sorry, there was an error uploading your file.";
}
}
?>
我找到了以下代码：
<?php
if ($_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>
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;
}
?>
就像我之前的代码一样，它传输文件。但是，它直到结尾都不会显示字节（即使它会对此有所提示），而且还会打开一个带有“完成”的新窗口。前一个窗口中的语句。
您可以检出此Php文件上传进度栏，以防您坚持使用Php显示进度，这可以帮助您入门。这使用PECL扩展名APC来获取上传文件的进度详细信息。可以使用apc_fetch()第一个链接的响应来计算服务器接收的字节数。
另一个有趣的跟踪上载进度教程，该教程使用Php的本机会话上载进度功能。
最后，如果您愿意使用Javascript（或JS库），那将是理想的选择。我知道的一个易于使用，易于设置，众所周知且维护良好的库是FineUploader
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