WP_Translation_Controller::get_headers( string $textdomain = ‘default’ ): array<string,

Source

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;
}

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