在PHP中，要实现文件上传进度监控，通常需要以下几个步骤：
<!DOCTYPE html>
<html>
<head>
<title>File Upload</title>
</head>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
Select file to upload:
<input type="file" name="fileToUpload" id="fileToUpload">
<br><br>
<input type="submit" value="Upload File" name="submit">
</form>
</body>
</html>
<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
// Check if file already exists
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$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.";
}
}
?>
<script>
function uploadFile() {
var fileInput = document.getElementById("fileToUpload");
var formData = new FormData();
formData.append("fileToUpload", fileInput.files[0]);
var xhr = new XMLHttpRequest();
xhr.upload.addEventListener("progress", function(event) {
if (event.lengthComputable) {
var progress = (event.loaded / event.total) * 100;
console.log("Upload progress: " + progress + "%");
}
}, false);
xhr.open("POST", "upload.php", true);
xhr.send(formData);
}
</script>
现在，当用户选择一个文件并点击上传按钮时，uploadFile函数会被调用。这个函数会创建一个FormData对象，将文件添加到该对象中，并使用XMLHttpRequest发送一个POST请求到服务器。同时，我们监听了progress事件，可以在控制台中查看上传进度。
请注意，这个示例仅用于演示目的。在实际项目中，你可能需要考虑更多的错误处理和安全性问题。
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