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How to implement FTP file upload progress bar using PHP

王林Original: 2023-07-30 18:51:221354browse

How to use PHP to implement FTP file upload progress bar

1. Background introduction
In website development, file upload is a common function. For the upload of large files, in order to improve the user experience, we often need to display an upload progress bar to the user to let the user know the file upload process. This article will introduce how to use PHP to implement the FTP file upload progress bar function.

2. How to implement the FTP file upload progress bar

Basic idea
The FTP file upload progress bar is usually implemented by calculating the uploaded file size and the uploaded file The proportion of the size, and then display this proportion on the front-end page to form a progress bar display.
Specific implementation steps
(1) Create an upload page, which contains a file upload form and a progress bar display box.
(2) In the back-end PHP, receive the uploaded file and upload the file to the FTP server through the FTP connection.
(3) During the process of receiving files, count the size of uploaded files and calculate the upload progress.
(4) Send the upload progress to the front-end page through AJAX or other methods, and update the display of the progress bar in real time.

3. PHP code example

Front-end page example (upload.html):

<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>FTP文件上传进度条</title>
 <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
 <script>
     $(document).ready(function () {
         $("form").submit(function (event) {
             event.preventDefault();
             var formData = new FormData($(this)[0]);
             $.ajax({
                 url: 'upload.php',
                 type: 'POST',
                 data: formData,
                 processData: false,
                 contentType: false,
                 xhr: function () {
                     var xhr = new window.XMLHttpRequest();
                     xhr.upload.addEventListener("progress", function (evt) {
                         if (evt.lengthComputable) {
                             var percentComplete = evt.loaded / evt.total;
                             // 更新进度条
                             $("#progress-bar").width(Math.round(percentComplete * 100) + '%');
                         }
                     }, false);
                     return xhr;
                 },
                 success: function () {
                     alert('文件上传成功！');
                 }
             });
         });
     });
 </script>
 <style>
     #progress-bar {
         width: 0%;
         height: 20px;
         background-color: #1E90FF;
     }
 </style>
</head>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
 <input type="file" name="file">
 <input type="submit" value="上传">
</form>
<div id="progress-bar"></div>
</body>
</html>

Backend PHP example (upload.php):

<?php
$ftp_server = "Your_FTP_Server";
$ftp_user = "Your_FTP_Username";
$ftp_password = "Your_FTP_Password";

$remote_file_path = "/upload/";

if ($_FILES["file"]["error"] > 0) {
 echo "文件上传失败！";
} else {
 $file_name = $_FILES["file"]["name"];
 $file_tmp = $_FILES["file"]["tmp_name"];
 $file_size = $_FILES["file"]["size"];

 $ftp_conn = ftp_connect($ftp_server);
 ftp_login($ftp_conn, $ftp_user, $ftp_password);
 ftp_pasv($ftp_conn, true);

 $remote_file = $remote_file_path . $file_name;

 if (ftp_put($ftp_conn, $remote_file, $file_tmp, FTP_BINARY)) {
     echo "文件上传成功！";
 } else {
     echo "文件上传失败！";
 }

 ftp_close($ftp_conn);
}
?>

In the above code example, the front-end page uses the jQuery library to handle AJAX requests by listening to the upload progress event xhr.upload.addEventListener ("progress", function (evt) {}) to update the width of the progress bar in real time. The backend PHP code receives the uploaded file and uses the FTP connection to upload the file to the FTP server.

4. Notes

Before using FTP to upload files, you need to ensure that the relevant information of the FTP server (such as server address, user name, password) is correct.
The progress bar style of the front-end page can be adjusted according to project needs.
In actual applications, it may be necessary to add processing logic and error prompts for upload failures.

5. Summary
Through the above method, we can use PHP to implement the FTP file upload progress bar function. In this way, when users upload large files, the user experience can be improved and users can clearly see the progress of file upload without having to wait for the upload to end. I hope the content of this article will be helpful to everyone.

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