mb_strrpos
(PHP 4 >= 4.0.6, PHP 5)
mb_strrpos — Find position of last occurrence of a string in a string
Описание
Performs a multibyte safe strrpos() operation based on the number of characters. needle position is counted from the beginning of haystack . First character's position is 0. Second character position is 1.
Список параметров
- haystack
-
The string being checked, for the last occurrence of needle
- needle
-
The string to find in haystack .
- offset
- May be specified to begin searching an arbitrary number of characters into the string. Negative values will stop searching at an arbitrary point prior to the end of the string.
- encoding
-
The encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.
Возвращаемые значения
Returns the numeric position of the last occurrence of needle in the haystack string. If needle is not found, it returns FALSE.
Список изменений
| Версия | Описание |
|---|---|
| 5.2.0 | Added the optional parameter offset . |
Примечания
Замечание: The encoding parameter was moved from the third position to the fourth in PHP 5.2.0. For backward compatibility, encoding can be specified as the third parameter, but doing so is deprecated and will be removed in the future.
Замечание: The internal encoding or the character encoding specified by mb_regex_encoding() will be used as the character encoding for this function.
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Поддержка языков и кодировок
- Многобайтные строки
- 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_encoding_aliases
- mb_ereg_match
- mb_ereg_replace_callback
- 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_list_encodings
- 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
Коментарии
mb_strrpos throws a warning if $haystack is empty.
strrpos simply returns FALSE.
This is something to be wary of if overloading the mb functions.
"Negative values will stop searching at an arbitrary point prior to the end of the string. " ist misleading.The needle may not fully part of searchrange, defined by a negative offset.
A negative offsets marks the last byte, where a search could start.
<?php
$test = "Hallo, Herr Gött";
var_dump(strlen($test)); // int(17)
var_dump(mb_strrpos($test,'ött',13)); // int(13)
var_dump(mb_strrpos($test,'ött',-4)); // int(13) 17-4 = 13
var_dump(mb_strrpos($test,'ött',-5)); // bool(false)
?>