- var_dump: documentation ( source)
- preg_match: documentation ( source)
<?php
$re = "/^[a-zA-Z ,.\p{Han}]$/";
var_dump(preg_match($re, 'Mr Smith'));
var_dump(preg_match($re, 'Mr. Smith'));
var_dump(preg_match($re, 'Mr. 123 Smith'));
var_dump(preg_match($re, '姓名'));