Post files received by php

The vc client uses the http post abc.txt file to send the post file to the php server. the abc.txt file received by the server is empty. Is it a php: // input problem. Thank you!

Vc client:
Content-Disposition: form-data; name = "upload"; filename = "abc.txt"
Content-Type: text/plain


Php server:
$ Input = file_get_contents ('php: // input ');
File_put_contents('abc.txt ', $ input );
?>

Reply to discussion (solution)

Use $ _ FILE to receive parameters.

To upload a file, use enctype = "multipart/form-data"
Php: // input does not accept such data, but the original post data (raw)

As you can see in the manual,
Php: // input is a read-only stream that can access the requested raw data. In the case of POST requests, it is best to use php: // input instead of $ HTTP_RAW_POST_DATA, because it does not rely on specific php. ini commands. In this case, $ HTTP_RAW_POST_DATA is not filled by default, which requires less memory than activating always_populate_raw_post_data. When enctype = "multipart/form-data", php: // input is invalid.

After checking the manual, php: // input is invalid when enctype = "multipart/form-data". use $ _ FILES. Thank you!