(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
过程化风格
$haystack,$size,$type = GRAPHEME_EXTR_COUNT,$offset = 0,&$next = nullFunction to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8.
haystackString to search.
size
Maximum number items - based on the type - to return.
type
Defines the type of units referred to by the size parameter:
size is the number of default
grapheme clusters to extract.size is the maximum number of bytes
returned.size is the maximum number of UTF-8
characters returned.offset
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 offset does not point to the first byte of a UTF-8
character, the start position is moved to the next character boundary.
nextReference 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.
A string starting at offset offset and ending on a default grapheme cluster
boundary that conforms to the size and type specified,
或者在失败时返回 false.
| 版本 | 说明 |
|---|---|
| 7.1.0 |
Support for negative offsets has been added.
|
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));
?>以上示例会输出：
o%CC%88