WordPress at a glance
function is not described

wp_install() WP 2.1.0

Installs the site.

Runs the required functions to set up and populate the database, including primary admin user and initial options.

Hooks from the function
Return

Array. Array keys 'url', 'user_id', 'password', and 'password_message'.

Usage

wp_install( $blog_title, $user_name, $user_email, $public, $deprecated, $user_password, $language );
$blog_title(string) (required)
Site title.
$user_name(string) (required)
User's username.
$user_email(string) (required)
User's email.
$public(true/false) (required)
Whether site is public.
$deprecated(string)
Not used.
Default: ''
$user_password(string)
User's chosen password.
Default: empty (random password)
$language(string)
Language chosen.
Default: ''

Changelog

Since 2.1.0 Introduced.

Code of wp install: wp-admin/includes/upgrade.php WP 5.2.2

<?php
function wp_install( $blog_title, $user_name, $user_email, $public, $deprecated = '', $user_password = '', $language = '' ) {
	if ( ! empty( $deprecated ) ) {
		_deprecated_argument( __FUNCTION__, '2.6.0' );
	}

	wp_check_mysql_version();
	wp_cache_flush();
	make_db_current_silent();
	populate_options();
	populate_roles();

	update_option( 'blogname', $blog_title );
	update_option( 'admin_email', $user_email );
	update_option( 'blog_public', $public );

	// Freshness of site - in the future, this could get more specific about actions taken, perhaps.
	update_option( 'fresh_site', 1 );

	if ( $language ) {
		update_option( 'WPLANG', $language );
	}

	$guessurl = wp_guess_url();

	update_option( 'siteurl', $guessurl );

	// If not a public site, don't ping.
	if ( ! $public ) {
		update_option( 'default_pingback_flag', 0 );
	}

	/*
	 * Create default user. If the user already exists, the user tables are
	 * being shared among sites. Just set the role in that case.
	 */
	$user_id        = username_exists( $user_name );
	$user_password  = trim( $user_password );
	$email_password = false;
	if ( ! $user_id && empty( $user_password ) ) {
		$user_password = wp_generate_password( 12, false );
		$message       = __( '<strong><em>Note that password</em></strong> carefully! It is a <em>random</em> password that was generated just for you.' );
		$user_id       = wp_create_user( $user_name, $user_password, $user_email );
		update_user_option( $user_id, 'default_password_nag', true, true );
		$email_password = true;
	} elseif ( ! $user_id ) {
		// Password has been provided
		$message = '<em>' . __( 'Your chosen password.' ) . '</em>';
		$user_id = wp_create_user( $user_name, $user_password, $user_email );
	} else {
		$message = __( 'User already exists. Password inherited.' );
	}

	$user = new WP_User( $user_id );
	$user->set_role( 'administrator' );

	wp_install_defaults( $user_id );

	wp_install_maybe_enable_pretty_permalinks();

	flush_rewrite_rules();

	wp_new_blog_notification( $blog_title, $guessurl, $user_id, ( $email_password ? $user_password : __( 'The password you chose during installation.' ) ) );

	wp_cache_flush();

	/**
	 * Fires after a site is fully installed.
	 *
	 * @since 3.9.0
	 *
	 * @param WP_User $user The site owner.
	 */
	do_action( 'wp_install', $user );

	return array(
		'url'              => $guessurl,
		'user_id'          => $user_id,
		'password'         => $user_password,
		'password_message' => $message,
	);
}