Description:
------------
file_get_contents ( string $filename , bool $use_include_path = false , resource $context = ? , int $offset = 0 , int $maxlen = ? ) : string|false

Source: https://www.php.net/manual/en/function.file-get-contents.php
`$maxlen` is actually `$length`.

Test script:
---------------
<?php

try {
    file_get_contents('php://input', length: 2000);
    file_get_contents('php://input', maxlen: 2000);
} catch (Error $e) {
    echo $e->getMessage();
}

Actual result:
--------------
Unknown named parameter $maxlen