public function in($haystack, $identical = false)
    {
        $this->addCondition(__METHOD__, [$haystack, $identical]);

        return $this;
    }
public function in($haystack, $identical = false)
    {
        $this->addCondition(__METHOD__, [$haystack, $identical]);

        return $this;
    }
public function in ( $ haystack , $ identical = false ) { $ this -> addCondition ( __METHOD__ , [ $ haystack , $ identical ] ) ; return $ this ; }
Validates if the input is contained in a specific haystack.

@param string $haystack
@param bool   $identical

@return \NilPortugues\Validator\Attribute\String\StringAttribute
Validates if the input is contained in a specific haystack .