grapheme_str_split("PHP")....: ["P", "H", "P"]
grapheme_str_split("你好")....: ["你", "好"]
grapheme_str_split("你好", 4)....: ["你好"]
grapheme_str_split("สวัสดี")....: ["ส", "วั", "ส", "ดี"]
grapheme_str_split("අයේෂ්")....: ["අ", "යේ", "ෂ්"]
grapheme_str_split("👭🏻👰🏿♂️")....: ["👭", "🏻", "👰", "🏿", "♂️"]
grapheme_str_split("👭🏻👰🏿♂️",2)....: ["👭🏻", "👰🏿", "♂️"]