mb_strrpos throws a warning if $haystack is empty.
strrpos simply returns FALSE.
This is something to be wary of if overloading the mb functions.
mb_strrpos
(PHP 4 >= 4.0.6, PHP 5, PHP 7)
mb_strrpos — Find position of last occurrence of a string in a string
Opis
mb_strrpos
( string
$haystack
, string $needle
[, int $offset = 0
[, string $encoding = mb_internal_encoding()
]] ) : int
Performs a multibyte safe
strrpos() operation based on the
number of characters. needle position is
counted from the beginning of
haystack. First character's position is
0. Second character position is 1.
Parametry
-
haystack -
The string being checked, for the last occurrence of
needle -
needle -
The string to find in
haystack. -
offset - May be specified to begin searching an arbitrary number of characters into the string. Negative values will stop searching at an arbitrary point prior to the end of the string.
-
encoding -
Parametr
encodingokreśla kodowanie znaków. Jeśli nie jest podany, to zostanie użyta wewnętrzna wartość kodowania zanków.
Zwracane wartości
Returns the numeric position of
the last occurrence of needle in the
haystack string. If
needle is not found, it returns FALSE.
Rejestr zmian
| Wersja | Opis |
|---|---|
| 5.2.0 | Added the optional parameter offset. |
Notatki
Informacja: The
encodingparameter was moved from the third position to the fourth in PHP 5.2.0. For backward compatibility,encodingcan be specified as the third parameter, but doing so is deprecated and will be removed in the future.
Zobacz też:
- mb_strpos() - Find position of first occurrence of string in a string
- mb_internal_encoding() - Set/Get internal character encoding
- strrpos() - Znajduje pozycję ostatniego wystąpienia znaku w ciągu znaków
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User Contributed Notes 2 notes
Anonymous ¶
18 years ago
Anonymous ¶
9 years ago
"Negative values will stop searching at an arbitrary point prior to the end of the string. " ist misleading.
The needle may not fully part of searchrange, defined by a negative offset.
A negative offsets marks the last byte, where a search could start.
<?php
$test = "Hallo, Herr Gött";
var_dump(strlen($test)); // int(17)
var_dump(mb_strrpos($test,'ött',13)); // int(13)
var_dump(mb_strrpos($test,'ött',-4)); // int(13) 17-4 = 13
var_dump(mb_strrpos($test,'ött',-5)); // bool(false)
?>
