Vendor/langcode-conv/zendframework/zend-filter/src/DataUnitFormatter.php
protected function getPrefixAt($index)
    {
        $prefixes = $this->getPrefixes();
        return isset($prefixes[$index]) ? $prefixes[$index] : null;
    }
protected function getPrefixAt($index)
    {
        $prefixes = $this->getPrefixes();
        return isset($prefixes[$index]) ? $prefixes[$index] : null;
    }
protected function getPrefixAt ( $ index ) { $ prefixes = $ this -> getPrefixes ( ) ; return isset ( $ prefixes [ $ index ] ) ? $ prefixes [ $ index ] : null ; }
Find the prefix at a specific location in the prefixes array.

@param $index

@return string|null
Find the prefix at a specific location in the prefixes array .