Insert value of params between " if the string have a space:
<?php
// First you need to create a service, you only need to do this once
/*
win32_create_service(array(
'service' => 'myphpservice',
'display' => 'My PHP Service',
'params' => '"c:\\my folder\myphpservice.php"',
'path' => 'c:\\PHP\\php.exe'));
*/
?>