Windows PHP-CLI truncates included scripts - php

Question

I'm really baffled by an issue of running a small PHP application on Windows using the CLI (5.6).
I am simply running my app with:
bin\php -f sync.php
What I get is a syntax error issued out of an include'd file. The bizarre thing is, it appears that PHP is actually truncating my included script during processing. I know this because if I remove some of that scripts content (reducing total bytes), I can eventually get it to process without error.
Other relevant information:
Running PHP 5.6
Running on a Windows 7 VM
Application function is to connect to a SQLLocalDb instance
PHP sqlsrv driver is installed
Errors are thrown when included script exceeds ~633 bytes
I have tried to switch both encoding and line endings to remedy without success
If you think the error output is relevant, here you go:
PHP Warning: Unexpected character in input: ' in S:\config.php on line 27
Warning: Unexpected character in input: ' in S:\config.php on line 27
PHP Parse error: syntax error, unexpected end of file in S:\config.php on line
27
Parse error: syntax error, unexpected end of file in S:\config.php on line 27
If I eliminate some characters from that script while keeping valid syntax, it will execute without error. Any thoughts as to the cause?
Edit: It turns out that something may be wrong with the format of my included script. So I'm posting it for context. Maybe it's been that long since I've worked on Windows, that I am forgetting some bizarre rule about PHP syntax:
<?php
/**
* Configuration settings.
*
* PHP Version 5
*
* #category Configuration
* #author XXXXXX XXXXXXXX
* #copyright 2016 XXXXXX XXXXXXXX, XXX. All Rights Reserved.
*/
$config = array(
'magento' => array(
'wsdl' => 'http://redacted-url-still-filling-needed-size/api/v2_soap/?wsdl=1',
'username' => 'user',
'password' => 'pass',
),
'last_sync' => '2016-09-01 00:00:00',
'db' => array(
'adapter' => 'app_db_sqlsrv',
'host' => 'localdbt',
'name' => 'dbname',
'username' => 'root',
'password' => 'password',
),
);