(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)
grapheme_substr — Return part of a string
过程化风格
$string
, int $start
[, int $length
] )Return part of a string
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.
length
Length 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, FALSE will be returned.
Returns the extracted part of $string.
| 版本 | 说明 |
|---|---|
| 5.4 |
If length is given and positive and the
argument string is shorter than the specified length, all the rest of
the string according to start parameter is
returned. Previously, FALSE was returned.
|
Example #1 grapheme_substr() 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_substr( "ao" . $char_a_ring_nfd . "bc" . $char_o_diaeresis_nfd . "O", 2, -1 ));
?>
以上例程会输出：
a%CC%8Abco%CC%88