grapheme_extract
(PHP 5 >= 5.3.0, PHP 7, PHP 8, 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
說明
過程化風格
string
$haystack,int
$size,int
$type = GRAPHEME_EXTR_COUNT,int
$offset = 0,int
&$next = null): string|false
Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8.
參數
-
haystack -
String to search.
-
size -
Maximum number items - based on the
type- to return. -
type -
Defines the type of units referred to by the
sizeparameter:- GRAPHEME_EXTR_COUNT (default) -
sizeis the number of default grapheme clusters to extract. - GRAPHEME_EXTR_MAXBYTES -
sizeis the maximum number of bytes returned. - GRAPHEME_EXTR_MAXCHARS -
sizeis the maximum number of UTF-8 characters returned.
- GRAPHEME_EXTR_COUNT (default) -
-
offset -
Starting position in
haystackin bytes - if given, it must be zero or a positive value that is less than or equal to the length ofhaystackin bytes, or a negative value that counts from the end ofhaystack. Ifoffsetdoes 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.
返回值
A string starting at offset offset and ending on a default grapheme cluster
boundary that conforms to the size and type specified,
或者在失敗時返回 false.
更新日誌
| 版本 | 說明 |
|---|---|
| 7.1.0 |
Support for negative offsets has been added.
|
範例
示例 #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));
?>
以上例程會輸出：
o%CC%88
參見
- grapheme_substr() - Return part of a string
- » Unicode Text Segmentation: Grapheme Cluster Boundaries