Php/docs/function.grapheme-strrpos
grapheme_strrpos
(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)
grapheme_strrpos — Find position (in grapheme units) of last occurrence of a string
说明
过程化风格
grapheme_strrpos
( string $haystack
, string $needle
[, int $offset = 0
] ) : int
Find position (in grapheme units) of last occurrence of a string
参数
haystack- The string to look in. Must be valid UTF-8.
needle- The string to look for. Must be valid UTF-8.
offset- The optional $offset parameter allows you to specify where in $haystack to start searching as an offset in grapheme units (not bytes or characters). The position returned is still relative to the beginning of haystack regardless of the value of $offset.
返回值
Returns the position as an integer. If needle is not found, grapheme_strrpos() will return boolean FALSE.
范例
Example #1 grapheme_strrpos() example
<?php$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 grapheme_strrpos( $char_a_ring_nfd . $char_o_diaeresis_nfd . $char_o_diaeresis_nfd, $char_o_diaeresis_nfd);?>
以上例程会输出：
2
参见
- grapheme_stripos() - Find position (in grapheme units) of first occurrence of a case-insensitive string
- grapheme_stristr() - Returns part of haystack string from the first occurrence of case-insensitive needle to the end of haystack
- grapheme_strpos() - Find position (in grapheme units) of first occurrence of a string
- grapheme_strripos() - Find position (in grapheme units) of last occurrence of a case-insensitive string
- grapheme_strstr() - Returns part of haystack string from the first occurrence of needle to the end of haystack
- » Unicode Text Segmentation: Grapheme Cluster Boundaries
