file_get_contents doesn't write to a log file - php

Question

I am trying to write content to a log file using form input data. This doesn't seem to work on a server that's is using php version 5.3.14 but when i put the same code on a server that uses 5.3.27 its working. Does any one have an idea on how to fix this?
Below is my code that i am using for my form action. incoming.log is the file that i am trying to write to and is found in the folder path live/lms on the server. Please not that i am not getting any errors.
<?php
$system_path = '/live/lms/';
$fh = fopen($system_path . "incoming.log", "a");
fwrite($fh, "\nReceived:\n" . date("Y-m-d H:i:s") . "\n" . file_get_contents("php://input"));
fclose($fh);
?>

Answer 1

Not exactly an answer, but advise:
You should add more error handling ...and structure the script in a way so you can add more error handling.
For starters (work in progress):
<?php
$system_path = '/live/lms/';
$fhSource = fopen('php://input', 'rb');
if (!$fhSource) {
trigger_error('fopen input: '. print_r(error_get_last(), true), E_USER_ERROR );
}
$fhTarget = fopen($system_path . "incoming.log", 'a');
if (!$fhTarget) {
trigger_error('fopen output: '. print_r(error_get_last(), true), E_USER_ERROR );
}
$cb = stream_copy_to_stream($fhSource, $fhTarget);
var_dump($cb);
fclose($fhSource);
fclose($fhTarget);