wp-includes/pomo/translations.php:254Gettext_Translations class.
$_npluralsintpublic$_gettext_select_plural_formcallablepublic class Gettext_Translations extends Translations { /** * Number of plural forms. * * @var int * * @since 2.8.0 */ public $_nplurals; /** * Callback to retrieve the plural form. * * @var callable * * @since 2.8.0 */ public $_gettext_select_plural_form; /** * The gettext implementation of select_plural_form. * * It lives in this class, because there are more than one descendant, which will use it and * they can't share it effectively. * * @since 2.8.0 * * @param int $count Plural forms count. * @return int Plural form to use. */ public function gettext_select_plural_form( $count ) { if ( ! isset( $this->_gettext_select_plural_form ) || is_null( $this->_gettext_select_plural_form ) ) { list( $nplurals, $expression ) = $this->nplurals_and_expression_from_header( $this->get_header( 'Plural-Forms' ) ); $this->_nplurals = $nplurals; $this->_gettext_select_plural_form = $this->make_plural_form_function( $nplurals, $expression ); } return call_user_func( $this->_gettext_select_plural_form, $count ); } /** * Returns the nplurals and plural forms expression from the Plural-Forms header. * * @since 2.8.0 * * @param string $header * @return array{0: int, 1: string} */ public function nplurals_and_expression_from_header( $header ) { if ( preg_match( '/^\s*nplurals\s*=\s*(\d+)\s*;\s+plural\s*=\s*(.+)$/', $header, $matches ) ) { $nplurals = (int) $matches[1]; $expression = trim( $matches[2] ); return array( $nplurals, $expression ); } else { return array( 2, 'n != 1' ); } } /** * Makes a function, which will return the right translation index, according to the * plural forms header. * * @since 2.8.0 * * @param int $nplurals * @param string $expression * @return callable */ public function make_plural_form_function( $nplurals, $expression ) { try { $handler = new Plural_Forms( rtrim( $expression, ';' ) ); return array( $handler, 'get' ); } catch ( Exception $e ) { // Fall back to default plural-form function. return $this->make_plural_form_function( 2, 'n != 1' ); } } /** * Adds parentheses to the inner parts of ternary operators inIntroduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/pomo/translations.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.