Finds position of first occurrence of a string within another, case insensitive

# mb_stripos

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

mb_stripos — Finds position of first occurrence of a string within another, case insensitive

### Description

mb_stripos(
string `$haystack`,
string `$needle`,
int `$offset` = 0,
?string `$encoding` = `null`
): int|false

mb_stripos() returns the numeric position of the first occurrence of `needle` in the `haystack` string. Unlike mb_strpos(), mb_stripos() is case-insensitive. If `needle` is not found, it returns `false`.

### Parameters

`haystack`

  The string from which to get the position of the first occurrence of `needle`

`needle`

  The string to find in `haystack`

`offset`

  The position in `haystack` to start searching. A negative offset counts from the end of the string.

`encoding`

  The `encoding` parameter is the character encoding. If it is omitted or `null`, the internal character encoding value will be used.

### Return Values

Return the numeric position of the first occurrence of `needle` in the `haystack` string, or `false` if `needle` is not found.

### 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 | `encoding` is nullable now.
7.1.0 | Support for negative `offset`s has been added.

### See Also

- stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
- strpos() - Find the position of the first occurrence of a substring in a string
- mb_strpos() - Find position of first occurrence of string in a string

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