Why does reading from a php://memory wrapper I've just written to fail?

Question

I'm trying to read from the php://memory wrapper using fread() but fread() always returns false. My code is simplified:

$file_handle = fopen('php://memory', 'w+'); // Have tried php:temp also.
fwrite($file_handle, 'contents');
$file = fread($file_handle, filesize($file_handle)); // Have also tried 99999 for filesize.

$file always is false after the fread().

What's going on?

Thanks in advance!

Answer 1

You'll need to rewind($file_handle) after writing before you can read what you've just written, because writing moves the file pointer to the end of the file

Answer 2

Call rewind($file_handle) before fread()