我建议您将 PHP I/O 流与 AJAX 一起使用。这将使服务器上的内存占用保持在较低水平,并且您可以轻松构建异步文件上传。请注意,这使用了仅在现代浏览器中可用的 HTML5 API。
查看这篇文章:https ://web.archive.org/web/20170803172549/http://www.webiny.com/blog/2012/05/07/webiny-file-upload-with-html5-and-ajax -使用-php-streams/
在此处粘贴文章中的代码:
HTML
<input type="file" name="upload_files" id="upload_files" multiple="multiple">
JS
function upload(fileInputId, fileIndex)
{
// take the file from the input
var file = document.getElementById(fileInputId).files[fileIndex];
var reader = new FileReader();
reader.readAsBinaryString(file); // alternatively you can use readAsDataURL
reader.onloadend = function(evt)
{
// create XHR instance
xhr = new XMLHttpRequest();
// send the file through POST
xhr.open("POST", 'upload.php', true);
// make sure we have the sendAsBinary method on all browsers
XMLHttpRequest.prototype.mySendAsBinary = function(text){
var data = new ArrayBuffer(text.length);
var ui8a = new Uint8Array(data, 0);
for (var i = 0; i < text.length; i++) ui8a[i] = (text.charCodeAt(i) & 0xff);
if(typeof window.Blob == "function")
{
var blob = new Blob([data]);
}else{
var bb = new (window.MozBlobBuilder || window.WebKitBlobBuilder || window.BlobBuilder)();
bb.append(data);
var blob = bb.getBlob();
}
this.send(blob);
}
// let's track upload progress
var eventSource = xhr.upload || xhr;
eventSource.addEventListener("progress", function(e) {
// get percentage of how much of the current file has been sent
var position = e.position || e.loaded;
var total = e.totalSize || e.total;
var percentage = Math.round((position/total)*100);
// here you should write your own code how you wish to proces this
});
// state change observer - we need to know when and if the file was successfully uploaded
xhr.onreadystatechange = function()
{
if(xhr.readyState == 4)
{
if(xhr.status == 200)
{
// process success
}else{
// process error
}
}
};
// start sending
xhr.mySendAsBinary(evt.target.result);
};
}
PHP
// read contents from the input stream
$inputHandler = fopen('php://input', "r");
// create a temp file where to save data from the input stream
$fileHandler = fopen('/tmp/myfile.tmp', "w+");
// save data from the input stream
while(true) {
$buffer = fgets($inputHandler, 4096);
if (strlen($buffer) == 0) {
fclose($inputHandler);
fclose($fileHandler);
return true;
}
fwrite($fileHandler, $buffer);
}