使php支持mbstring库
php_mbstring.dll 文件。然后编辑php.ini文件：
extension=php_mbstring.dll
output_handler = "mb_output_handler"
default_charset = "UTF-8"
mbstring.language = Chinese
mbstring.internal_encoding = UTF-8
mbstring.http_input = auto
mbstring.http_output = UTF-8
mbstring.encoding_translation = On
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