WordPress custom install script

install.php

<?php
/**
 * WordPress custom install script.
 *
 * Drop-ins are advanced plugins in the wp-content directory that replace WordPress functionality when present.
 *
 * Language: nl
 *
 * if ( file_exists( WP_CONTENT_DIR . '/install.php' ) ) {
 *   require ( WP_CONTENT_DIR . '/install.php' );
 * }
 */

function wp_install_defaults( $user_id ) {
	global $wpdb, $wp_rewrite, $current_site, $table_prefix;

	/** @see wp-admin/options-general.php */

	/** Date format: "23 November 2014" */
	update_option( 'date_format', 'j F Y' );

	/** Time format: "20:56" */
	update_option( 'time_format', 'H:i' );

	/** Time zone: "Amsterdam" */
	update_option( 'timezone_string', 'Europe/Amsterdam' );

	/** @see wp-admin/options-discussion.php */

	/** Before a comment appears a comment must be manually approved: true */
	update_option( 'comment_moderation', 1 );

	/** Before a comment appears the comment author must have a previously approved comment: false */
	update_option( 'comment_whitelist', 0 );

	/** Allow people to post comments on new articles (this setting may be overridden for individual articles): false */
	update_option( 'default_comment_status', 0 );

	/** Allow link notifications from other blogs: false */
	update_option( 'default_ping_status', 0 );

	/** Attempt to notify any blogs linked to from the article: false */
	update_option( 'default_pingback_flag', 0 );

	/** Show avatars: false */
	update_option( 'show_avatars', 0 );

	/** Enable threaded (nested) comments: false */
	update_option( 'thread_comments', 0 );

	/** @see wp-admin/options-media.php */

	/** Organize my uploads into month- and year-based folders: false */
	update_option( 'uploads_use_yearmonth_folders', 0 );

	/** @see wp-admin/options-permalink.php */

	/** Category base: /categorie */
	update_option( 'category_base', '/categorie' );

	/** Permalink custom structure: /%postname% */
	update_option( 'permalink_structure', '/%postname%' );

	/** Tag base: /trefwoord */
	update_option( 'tag_base', '/trefwoord' );

	/** @see wp-admin/includes/upgrade.php */

	/** Default category */
	$cat_name = __( 'Ongecategoriseerd' );

	$cat_slug = sanitize_title( _x( 'ongecategoriseerd', 'Default category slug' ) );

	if ( global_terms_enabled() ) {
		$cat_id = $wpdb->get_var( $wpdb->prepare( "SELECT cat_ID FROM {$wpdb->sitecategories} WHERE category_nicename = %s", $cat_slug ) );

		if ( $cat_id == null ) {
			$wpdb->insert(
				$wpdb->sitecategories, array(
					'cat_ID'            => 0,
					'cat_name'          => $cat_name,
					'category_nicename' => $cat_slug,
					'last_updated'      => current_time( 'mysql', true )
				)
			);
			$cat_id = $wpdb->insert_id;
		}
		update_option( 'default_category', $cat_id );
	} else {
		$cat_id = 1;
	}

	$wpdb->insert(
		$wpdb->terms, array(
			'name'       => $cat_name,
			'slug'       => $cat_slug,
			'term_group' => 0,
			'term_id'    => $cat_id,
		)
	);

	$wpdb->insert(
		$wpdb->term_taxonomy, array(
			'count'       => 0,
			'description' => '',
			'parent'      => 0,
			'taxonomy'    => 'category',
			'term_id'     => $cat_id,
		)
	);

	$cat_tt_id = $wpdb->insert_id;

	/** @see wp-admin/includes/screen.php */

	/** Show welcome panel: false */
	update_user_meta( $user_id, 'show_welcome_panel', 0 );

	/** @see wp-includes/user.php */

	/** Disable the visual editor when writing: false */
	update_user_meta( $user_id, 'rich_editing', 0 );

	/** Show toolbar when viewing site: false */
	update_user_meta( $user_id, 'show_admin_bar_front', 0 );
}