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// Filter English punctuation
$word = preg_replace("/[[:punct:]]/i", " ", $word);

// Filter Chinese punctuation
mb_regex_encoding('utf-8');
$char = "。、！？：；﹑•＂…''""〝〞∕¦‖—　〈〉﹞﹝「」‹›〖〗】【»«』『〕〔》《﹐¸﹕︰﹔！¡？¿﹖﹌﹏﹋＇´ˊˋ―﹫︳︴¯＿￣﹢﹦﹤‐­˜﹟﹩﹠﹪﹡﹨﹍﹉﹎﹊ˇ︵︶︷︸︹︿﹀︺︽︾ˉ﹁﹂﹃﹄︻︼（）";
$word = mb_ereg_replace("[".$char."]", " ", $word, "UTF-8");

// Filter consecutive spaces
$word = preg_replace("/\s+/", " ", $word);