百科狗grapheme_substr() - Grapheme函数
grapheme_substr()
(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)
Return part of a string
说明
过程化风格grapheme_substr(string $string,int $start[,int $length]): string
Return part of a string
参数
$stringThe input string. Must be valid UTF-8.
$startStart position in default grapheme units. If $start is non-negative, the returned string will start at the $start'th position in $string, counting from zero. If $start is negative, the returned string will start at the $start'th grapheme unit from the end of string.
$lengthLength in grapheme units. If $length is given and is positive, the string returned will contain at most $length grapheme units beginning from $start(depending on the length of string). If $length is given and is negative, then that many grapheme units will be omitted from the end of string(after the start position has been calculated when a start is negative). If $start denotes a position beyond this truncation,FALSEwill be returned.
返回值
Returns the extracted part of $string.
更新日志
| 版本 | 说明 |
|---|---|
| 5.4 | If$lengthis given and positive and the argument string is shorter than the specified length, all the rest of the string according to$startparameter is returned. Previously,FALSEwas returned. |
范例
grapheme_substr()example
以上例程会输出：
a%CC%8Abco%CC%88
参见
grapheme_extract()Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8- » Unicode Text Segmentation: Grapheme Cluster Boundaries
