file_get_contents( php //input ) uses code example

Example 1: php file_get_contents

<?php
$homepage = file_get_contents('http://www.example.com/');
echo $homepage;
?>

Example 2: file_get_contents('php //input')

Actually php://input allows you to read raw POST data.

It is a less memory intensive alternative to $HTTP_RAW_POST_DATA and does not need any special php.ini directives.

php://input is not available with enctype="multipart/form-data".

Reference: http://php.net/manual/en/wrappers.php.php