Detect the_content for Japanese multibyte Characters on wordpress

detect_the_content.php

<?php
function mb_trim($str) {
	static $chars = "[\\x0-\x20\x7f\xc2\xa0\xe3\x80\x80]";
	return preg_replace("/\A{$chars}++|{$chars}++\z/u", '', strip_tags($str));
}

$content = mb_trim(get_the_content());
if($content === ""){
	echo '<p>Empty Content</p>';
}else{
	echo '<p>NOT Empty Content</p>';
}
?>