As expected, grapheme_stripos() does return boolean FALSE if the needle is not found in the haystack.
Use strict type comparison to check for that condition, like:
if (FALSE === grapheme_stripos('a', 'b')) {print 'Needle not found';}
grapheme_stripos
(PHP 5 >= 5.3.0, PECL intl >= 1.0.0)
grapheme_stripos — Find position (in grapheme units) of first occurrence of a case-insensitive string
說明
程序化風格
int grapheme_stripos
( string
$haystack
, string $needle
[, int $offset = 0
] )Find position (in grapheme units) of first occurrence of a case-insensitive string
參數
-
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.
回傳值
Returns the position as an integer. If needle is not found, grapheme_stripos() will return boolean FALSE.
範例
Example #1 grapheme_stripos() 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_stripos( $char_a_ring_nfd . $char_a_ring_nfd . $char_o_diaeresis_nfd, $char_O_diaeresis_nfd);
?>
上例將輸出：
2
參見
- 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_strrpos() - Find position (in grapheme units) of last occurrence of a 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
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