PHP 判断字符串是否符合指定格式编码－mb_check_encoding

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true

gbk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true

utf-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