纯数字和英文字母组合：
$utf8Str = "I have 4 books and 2 magazines to check out. ";var_dump(mb_check_encoding($utf8Str,'utf-8')); //输出truevar_dump(mb_check_encoding($utf8Str,'gbk')); //输出truegbk编码的字符串
$str = '迷你tablet或于本月23日发布。';var_dump(mb_check_encoding($str,'utf-8')); //输出falsevar_dump(mb_check_encoding($str,'gbk')); //输出trueutf-8编码的字符串
$str = '迷你tablet或于本月23日发布。';var_dump(mb_check_encoding($str,'utf-8')); //输出truevar_dump(mb_check_encoding($str,'gbk')); //输出false新闻热点
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