grapheme_extract
(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)
grapheme_extract — Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8
Описание
Процедурный стиль
$haystack
, int $size
, int $extract_type = ?
, int $start = 0
, int &$next = ?
) : stringFunction to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8.
Список параметров
-
haystack -
String to search.
-
size -
Maximum number items - based on the $extract_type - to return.
-
extract_type -
Defines the type of units referred to by the $size parameter:
- GRAPHEME_EXTR_COUNT (default) - $size is the number of default grapheme clusters to extract.
- GRAPHEME_EXTR_MAXBYTES - $size is the maximum number of bytes returned.
- GRAPHEME_EXTR_MAXCHARS - $size is the maximum number of UTF-8 characters returned.
-
start -
Starting position in $haystack in bytes - if given, it must be zero or a positive value that is less than or equal to the length of $haystack in bytes, or a negative value that counts from the end of $haystack. If $start does not point to the first byte of a UTF-8 character, the start position is moved to the next character boundary.
-
next -
Reference to a value that will be set to the next starting position. When the call returns, this may point to the first byte position past the end of the string.
Возвращаемые значения
A string starting at offset $start and ending on a default grapheme cluster boundary that conforms to the $size and $extract_type specified.
Список изменений
| Версия | Описание |
|---|---|
| 7.1.0 |
Support for negative starts has been added.
|
Примеры
Пример #1 grapheme_extract() example
<?php
$char_a_ring_nfd = "a\xCC\x8A"; // 'LATIN SMALL LETTER A WITH RING ABOVE' (U+00E5) normalization form "D"
$char_o_diaeresis_nfd = "o\xCC\x88"; // 'LATIN SMALL LETTER O WITH DIAERESIS' (U+00F6) normalization form "D"
print urlencode(grapheme_extract( $char_a_ring_nfd . $char_o_diaeresis_nfd, 1, GRAPHEME_EXTR_COUNT, 2));
?>
Результат выполнения данного примера:
o%CC%88
Смотрите также
- grapheme_substr() - Return part of a string
- » Unicode Text Segmentation: Grapheme Cluster Boundaries