Source

File: wp-admin/includes/template.php

function do_settings_sections( $page ) {
	global $wp_settings_sections, $wp_settings_fields;

	if ( ! isset( $wp_settings_sections[ $page ] ) ) {
		return;
	}

	foreach ( (array) $wp_settings_sections[ $page ] as $section ) {
		if ( $section['title'] ) {
			echo "<h2>{$section['title']}</h2>\n";
		}

		if ( $section['callback'] ) {
			call_user_func( $section['callback'], $section );
		}

		if ( ! isset( $wp_settings_fields ) || ! isset( $wp_settings_fields[ $page ] ) || ! isset( $wp_settings_fields[ $page ][ $section['id'] ] ) ) {
			continue;
		}
		echo '<table class="form-table" role="presentation">';
		do_settings_fields( $page, $section['id'] );
		echo '</table>';
	}
}