Including a php file with a different encoding can be very frustrating. Here is a method to get that done!

mb_include.php

define("MB_INCLUDE_BLOCK", 3000);

function mb_echo($str, $to_encoding, $from_encoding) {
	$len = mb_strlen($str);
	for($pos=0; $pos < $len;) {
		$part = mb_strcut($str, $pos, min($len-$pos, MB_INCLUDE_BLOCK), $from_encoding);
		$pos += strlen($part);
		$converted = mb_convert_encoding($part, $to_encoding, $from_encoding);
		echo $converted;
		flush();
	}
}

function mb_include($file, $to_encoding, $from_encoding) {
	flush();
	ob_start();
	include($file);
	$str = ob_get_contents();
	ob_end_clean();
	mb_echo($str, $to_encoding, $from_encoding);
}

Example: mb_include("other.php", "UTF-8", "Shift-JIS");