PHP File_put_contents not working

Question

Check this code:

Answer 1

You can't write a remote file via http.(If you could do that, every one else could change that file also.)

You need to use the local path.

Answer 2

try changing directory properties

chown www-data:www-data <dirname>

and/or write as follows, if you host on linux

<?php
$var ="hi";
shell_exec('echo "'.$var.'">>log.txt');
?>