Finds the last occurrence of a character in a string within another, case insensitive

# mb_strrichr

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

mb_strrichr — Finds the last occurrence of a character in a string within another, case insensitive

### Description

mb_strrichr(
string `$haystack`,
string `$needle`,
bool `$before_needle` = `false`,
?string `$encoding` = `null`
): string|false

mb_strrichr() finds the last occurrence of `needle` in `haystack` and returns the portion of `haystack`. Unlike mb_strrchr(), mb_strrichr() is case-insensitive. If `needle` is not found, it returns `false`.

### Parameters

`haystack`

  The string from which to get the last occurrence of `needle`.

`needle`

  The string to find in `haystack`.

`before_needle`

  Determines which portion of `haystack` this function returns. If set to `true`, it returns all of `haystack` from the beginning to the last occurrence of `needle`. If set to `false`, it returns all of `haystack` from the last occurrence of `needle` to the end.

`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 portion of `haystack`. or `false` if `needle` is not found.

### Changelog

Version | Description
--- | ---
8.0.0 | `needle` now accepts an empty string.
8.0.0 | `encoding` is nullable now.

### See Also

- mb_stristr() - Finds first occurrence of a string within another, case insensitive
- mb_strrchr() - Finds the last occurrence of a character in a string within another

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