# mb_stristr

(PHP 5 >= 5.2.0)

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

### Description

string mb_stristr ( string `$haystack` , string `$needle` [, bool `$part` [, string `$encoding` ]] )

mb_stristr() finds the first occurrence of `needle` in `haystack` and returns the portion of `haystack` . Unlike mb_strstr(), mb_stristr() is case-insensitive. If `needle` is not found, it returns `FALSE`.

### Parameters

`haystack`

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

`needle`

  The string to find in `haystack`

`part`

  Determines which portion of `haystack` this function returns. If set to `TRUE`, it returns all of `haystack` from the beginning to the first occurrence of `needle` . If set to `FALSE`, it returns all of `haystack` from the first occurrence of `needle` to the end, Default value is `FALSE`.

`encoding`

  Character encoding name to use. If it is omitted, internal character encoding is used.

### Return Values

Returns the portion of `haystack` , or `FALSE` if `needle` is not found.

### See Also

- stristr()
- strstr()
- mb_strstr()