PHP Manual
Multibyte String Functions
Find position of last occurrence of a string in a string

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

Description

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.

Parameters

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 haystack. Negative values will stop searching at an arbitrary point prior to the end of the haystack.
encoding: The encoding parameter is the character encoding. If it is omitted or null, the internal character encoding value will be used.

Return Values

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

Errors/Exceptions

If offset is greater than the length of haystack, a ValueError will be thrown.

Changelog

Version	Description
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.