mb_strrpos

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

mb_strrpos — Find position of last occurrence of a string in a string

Descrierea

mb_strrpos ( string $haystack , string $needle [, int $offset = 0 [, string|null $encoding = null ]] ) : int|false

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.

Parametri

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: Parametrul encoding reprezintă codificarea caracterelor. Dacă el este omis, va fi utilizată valoarea internă a codificării caracterelor.

Valorile întoarse

Returns the numeric position of the last occurrence of needle in the haystack string. If needle is not found, it returns false.

Note

Notă: The encoding parameter was moved from the third position to the fourth in PHP 5.2.0. For backward compatibility, encoding can be specified as the third parameter, but doing so is deprecated and will be removed in the future.

Istoricul schimbărilor

Versiune	Descriere
8.0.0	`encoding` is nullable now.

A se vedea și

mb_strpos() - Find position of first occurrence of string in a string
mb_internal_encoding() - Set/Get internal character encoding
strrpos() - Find the position of the last occurrence of a substring in a string

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User Contributed Notes 2 notes

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Anonymous ¶

19 years ago


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.

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Anonymous ¶

10 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)
?>

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