如何用PHP接收前端传输过来的文件，formdata这个对象的文件到是什么类型的二进制的数据吗？
前端代码：
<input type="file" name="file" id="file" multiple>
<script type="text/javascript">
var file = document.querySelector("#file");
file.onchange = function(){
var files = this.files;
for(var i=0;i<files.length;i++){
ajax('ajax.php',files[i],function(data){
console.log(data)
console.log('fn')
})
}
}
function ajax(url,data,fn){
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(){
if(xhr.readyState==4&&xhr.status==200){
fn(xhr.responseText)
}
}
var formData = new FormData();
formData.append('file',data);
xhr.open('POST',url,true);
//xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xhr.send(formData);
}
</script>php代码：
<?php
if(!empty($_FILES['file'])){
$fileinfo = $_FILES['file'];
$destination = "image/";
$destination = $destination.basename($_FILES['file']['name']);
move_uploaded_file($fileinfo['tmp_name'],$destination);
echo "succ";
}
?>不知道为什么if(!empty($_FILES['file']))这判断一直false，改用if(!empty($_POST['file']))也是一样；哪位知道后台是如何接收传过来的文件的吗？可不可以给个demo的PHP文件!
我在php中加了3个日志记录：
file_put_contents('/tmp/tmp.log', '$_FILES'.":\n".print_r($_FILES, true)."\n\n", FILE_APPEND);
file_put_contents('/tmp/tmp.log', '$_POST'.":\n".print_r($_POST, true)."\n\n", FILE_APPEND);
file_put_contents('/tmp/tmp.log', '$_SERVER'.":\n".print_r($_SERVER, true)."\n\n", FILE_APPEND);存储路径改成tmp了，其他没变，得到的结果：
[root@localhost tmp]# cat tmp.log
$_FILES:
Array
(
[file] => Array
(
[name] => Screenshot_2010-01-01-08-11-30.png
[type] => image/png
[tmp_name] => /tmp/phposvIcw
[error] => 0
[size] => 30920
)
)
$_POST:
Array
(
)
$_SERVER:
Array
(
[USER] => nginx
[HOME] => /var/lib/nginx
[FCGI_ROLE] => RESPONDER
[SCRIPT_FILENAME] => /var/www/test.php
[SCRIPT_NAME] => /test.php
[PATH_INFO] =>
[QUERY_STRING] =>
[REQUEST_METHOD] => POST
[CONTENT_TYPE] => multipart/form-data; boundary=----WebKitFormBoundaryiJpJZSxazdqa8hzb
[CONTENT_LENGTH] => 31127
[REQUEST_URI] => /test.php
[DOCUMENT_URI] => /test.php
[DOCUMENT_ROOT] => /var/www
[SERVER_PROTOCOL] => HTTP/1.1
[GATEWAY_INTERFACE] => CGI/1.1
[SERVER_SOFTWARE] => nginx/1.6.3
[REMOTE_ADDR] => 192.168.255.1
[REMOTE_PORT] => 60032
[SERVER_ADDR] => 192.168.255.128
[SERVER_PORT] => 80
[SERVER_NAME] =>
[REDIRECT_STATUS] => 200
[HTTP_HOST] => 192.168.255.128
[HTTP_CONNECTION] => keep-alive
[HTTP_CONTENT_LENGTH] => 31127
[HTTP_ORIGIN] => http://192.168.255.128
[HTTP_USER_AGENT] => Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36
[HTTP_CONTENT_TYPE] => multipart/form-data; boundary=----WebKitFormBoundaryiJpJZSxazdqa8hzb
[HTTP_ACCEPT] => */*
[HTTP_DNT] => 1
[HTTP_REFERER] => http://192.168.255.128/test.html
[HTTP_ACCEPT_ENCODING] => gzip, deflate
[HTTP_ACCEPT_LANGUAGE] => zh-CN,zh;q=0.8,ja;q=0.6,en;q=0.4
[PHP_SELF] => /test.php
[REQUEST_TIME_FLOAT] => 1470377177.1168
[REQUEST_TIME] => 1470377177
)
文件成功上传
[root@localhost tmp]# ll
total 36
-rw-r--r-- 1 nginx nginx 30920 Aug 5 14:06 Screenshot_2010-01-01-08-11-30.png
-rw-r--r-- 1 nginx nginx 1705 Aug 5 14:06 tmp.log
[root@localhost tmp]# 没有出错……
打开chrome的控制台看看请求Request发送了什么，主要看请求头的Content-Type和请求体
楼主用$_REQUES接收试一下吧。
先来个打印看看啊！先别用if判断。直接
echo 'FILES:'.var_dump($_FILES);
echo 'POST:'.var_dump($_POST);
die();看看是什么东东。然后在一步一步的来
F12看请求啊