純數字和英文字母組合：
$utf8Str = "I have 4 books and 2 magazines to check out. ";var_dump(mb_check_encoding($utf8Str,'utf-8')); //輸出truevar_dump(mb_check_encoding($utf8Str,'gbk')); //輸出truegbk編碼的字符串
$str = '迷你tablet或于本月23日發布。';var_dump(mb_check_encoding($str,'utf-8')); //輸出falsevar_dump(mb_check_encoding($str,'gbk')); //輸出trueutf-8編碼的字符串
$str = '迷你tablet或于本月23日發布。';var_dump(mb_check_encoding($str,'utf-8')); //輸出truevar_dump(mb_check_encoding($str,'gbk')); //輸出false新聞熱點
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