grapheme_extract()

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)

Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8

说明

Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8.

参数

String to search.

Maximum number items - based on the $extract_type - to return.

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.

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.

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 $start and ending on a default grapheme cluster boundary that conforms to the $size and $extract_type specified.

更新日志

范例

grapheme_extract()example

以上例程会输出：

o%CC%88

参见

• grapheme_substr()Return part of a string
• » Unicode Text Segmentation: Grapheme Cluster Boundaries

Here's how to use grapheme_extract() to loop across a UTF-8 string character by character.