(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)
grapheme_strripos — Find position (in grapheme units) of last occurrence of a case-insensitive string
过程化风格
$haystack
, string $needle
[, int $offset = 0
] ) : intFind position (in grapheme units) of last occurrence of a case-insensitive string
haystackThe string to look in. Must be valid UTF-8.
needleThe string to look for. Must be valid UTF-8.
offsetThe 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.
Returns the position as an integer. If needle is not found, grapheme_strripos() will return boolean FALSE.
Example #1 grapheme_strripos() 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"
$char_O_diaeresis_nfd = "O\xCC\x88"; // 'LATIN CAPITAL LETTER O WITH DIAERESIS' (U+00D6) normalization form "D"
print grapheme_strripos( $char_a_ring_nfd . $char_o_diaeresis_nfd . $char_o_diaeresis_nfd, $char_O_diaeresis_nfd);
?>
以上例程会输出：
2