Try modified code become:
<?php
$IPUnblock = array("110.136.", "108.174.");
$RemoteAddr = $_SERVER['REMOTE_ADDR'];
$AccessPermit = false;
foreach ($IPUnblock as $k => $v) {
if (strpos($RemoteAddr, $v) !== false) {
$AccessPermit = true;
continue;
}
}
if ($AccessPermit === false) {
if (strpos(file_get_contents("http://www.stopforumspam.com/api?ip={$RemoteAddr}"),
'<appears>yes</appears>')!==false) {
die('Go away, Spammer.');
}
}