wp-includes/l10n/class-wp-translation-controller.php:330Returns all existing headers for a given text domain.
$textdomainstringoptional'default'array<string, public function get_headers( string $textdomain = 'default' ): array { if ( array() === $this->loaded_translations ) { return array(); } $headers = array(); foreach ( $this->get_files( $textdomain ) as $moe ) { foreach ( $moe->headers() as $header => $value ) { $headers[ $this->normalize_header( $header ) ] = $value; } } return $headers; }Introduced in 6.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/l10n/class-wp-translation-controller.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.