mb_strrpos

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

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

Descrizione

mb_strrpos(
    string $haystack,
    string $needle,
    int $offset = 0,
    ?string $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.

Elenco dei 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: Il parametro encoding è la codifica dei caratteri. Se è omesso, verrà utilizzata la codifica interna.

Valori restituiti

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

Log delle modifiche

Versione	Descrizione
8.0.0	`needle` now accepts an empty string.
8.0.0	Passing the `encoding` as the third argument instead of an offset has been removed.
8.0.0	`encoding` is nullable now.

Vedere anche:

mb_strpos() - Find position of first occurrence of string in a string
mb_internal_encoding() - Set/Get internal character encoding
strrpos() - Trova la posizione dell'ultima occorrenza di un carattere in una stringa

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User Contributed Notes 2 notes

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Anonymous ¶

18 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 ¶

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)
?>

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