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Digg mb_check_encoding
Check if the string is valid for the specified encoding
(PHP 4 >= 4.4.3, PHP 5 >= 5.1.3)
mb_check_encoding() checks if the specified byte stream is valid for the specified encoding. It is useful to prevent so-called "Invalid Encoding Attack". Code Examples / Notes » mb_check_encodingolexa riznyk
This function returns true incorrectly sometimes (at least when internal encoding is UTF-8 and encoding being checked for is Windows-1251, and PHP version 4.4.4 on FreeBSD 6.2 STABLE). This bug was not answered in bug reporting yet, so here is a workaround: Instead of checking for this: <?php mb_check_encoding($var, $destination_encoding) ?> check for this: <?php mb_check_encoding($var, $destination_encoding) && mb_substr_count($var, '?', $source_encoding) == mb_substr_count(mb_convert_encoding($var, $destination_encoding, $source_encoding), '?', $destination_encoding) ?> The idea is to count question mark characters ('?') in original value and converted value, because mb_convert_encoding function uses question marks to substitute characters that are not valid in destination encoding. |
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mb_check_encoding mb_convert_case mb_convert_encoding mb_convert_kana mb_convert_variables mb_decode_mimeheader mb_decode_numericentity mb_detect_encoding mb_detect_order mb_encode_mimeheader mb_encode_numericentity mb_ereg_match mb_ereg_replace mb_ereg_search_getpos mb_ereg_search_getregs mb_ereg_search_init mb_ereg_search_pos mb_ereg_search_regs mb_ereg_search_setpos mb_ereg_search mb_ereg mb_eregi_replace mb_eregi mb_get_info mb_http_input mb_http_output mb_internal_encoding mb_language mb_output_handler mb_parse_str mb_preferred_mime_name mb_regex_encoding mb_regex_set_options mb_send_mail mb_split mb_strcut mb_strimwidth mb_stripos mb_stristr mb_strlen mb_strpos mb_strrchr mb_strrichr mb_strripos mb_strrpos mb_strstr mb_strtolower mb_strtoupper mb_strwidth mb_substitute_character mb_substr_count mb_substr |
