Populate internal values from a string.
string $header: Full header string with key-value pairs.
public function setFromString($header) {
// Get an array of all header values for processing.
$values = $this
->parseHeader($header);
// There is only one value relevant for our header implementation when
// reading, and that is the plural formula.
if (!empty($values['Plural-Forms'])) {
$this->_pluralForms = $values['Plural-Forms'];
}
}