在PHP中，mb_str函数支持以下编码格式：
UTF-8ASCIIISO-8859-1 (Latin1)ISO-8859-2 (Latin2)ISO-8859-3 (Latin3)ISO-8859-4 (Latin4)ISO-8859-5 (Cyrillic)ISO-8859-6 (Arabic)ISO-8859-7 (Greek)ISO-8859-8 (Hebrew)ISO-8859-9 (Latin5)ISO-8859-10 (Latin6)ISO-8859-13 (Latin7)ISO-8859-14 (Latin8)ISO-8859-15 (Latin9)ISO-8859-16 (Latin10)Windows-1251 (Cyrillic)Windows-1252 (Latin1)Windows-1254 (Turkish)Shift JIS (Japanese)EUC-JP (Japanese)ISO-2022-JP (Japanese)CP932 (Japanese)UCS-2 (Unicode)UCS-4 (Unicode)UTF-16 (Unicode)UTF-32 (Unicode)UTF-7UTF-7-IMAPUTF-8-MACUTF-8-HFS这些编码格式可以在mb_str函数中用来处理相应的字符串。
