display_setup_form() WordPress Function

function display_setup_form( $error = null ) {
	global $wpdb;

	$user_table = ( $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $wpdb->esc_like( $wpdb->users ) ) ) !== null );

	// Ensure that sites appear in search engines by default.
	$blog_public = 1;
	if ( isset( $_POST['weblog_title'] ) ) {
		$blog_public = isset( $_POST['blog_public'] );
	}

	$weblog_title = isset( $_POST['weblog_title'] ) ? trim( wp_unslash( $_POST['weblog_title'] ) ) : '';
	$user_name    = isset( $_POST['user_name'] ) ? trim( wp_unslash( $_POST['user_name'] ) ) : '';
	$admin_email  = isset( $_POST['admin_email'] ) ? trim( wp_unslash( $_POST['admin_email'] ) ) : '';

	if ( ! is_null( $error ) ) {
		?>
<h1><?php _ex( 'Welcome', 'Howdy' ); ?></h1>
<p class="message"><?php echo $error; ?></p>
<?php } ?>
<form id="setup" method="post" action="install.php?step=2" novalidate="novalidate">
	<table class="form-table" role="presentation">
		<tr>
			<th scope="row"><label for="weblog_title"><?php _e( 'Site Title' ); ?></label></th>
			<td><input name="weblog_title" type="text" id="weblog_title" size="25" value="<?php echo esc_attr( $weblog_title ); ?>" /></td>
		</tr>
		<tr>
			<th scope="row"><label for="user_login"><?php _e( 'Username' ); ?></label></th>
			<td>
			<?php
			if ( $user_table ) {
				_e( 'User(s) already exists.' );
				echo '<input name="user_name" type="hidden" value="admin" />';
			} else {
				?>
				<input name="user_name" type="text" id="user_login" size="25" value="<?php echo esc_attr( sanitize_user( $user_name, true ) ); ?>" />
				<p><?php _e( 'Usernames can have only alphanumeric characters, spaces, underscores, hyphens, periods, and the @ symbol.' ); ?></p>
				<?php
			}
			?>
			</td>
		</tr>
		<?php if ( ! $user_table ) : ?>
		<tr class="form-field form-required user-pass1-wrap">
			<th scope="row">
				<label for="pass1">
					<?php _e( 'Password' ); ?>
				</label>
			</th>
			<td>
				<div class="wp-pwd">
					<?php $initial_password = isset( $_POST['admin_password'] ) ? stripslashes( $_POST['admin_password'] ) : wp_generate_password( 18 ); ?>
					<input type="password" name="admin_password" id="pass1" class="regular-text" autocomplete="new-password" data-reveal="1" data-pw="<?php echo esc_attr( $initial_password ); ?>" aria-describedby="pass-strength-result" />
					<button type="button" class="button wp-hide-pw hide-if-no-js" data-start-masked="<?php echo (int) isset( $_POST['admin_password'] ); ?>" data-toggle="0" aria-label="<?php esc_attr_e( 'Hide password' ); ?>">
						<span class="dashicons dashicons-hidden"></span>
						<span class="text"><?php _e( 'Hide' ); ?></span>
					</button>
					<div id="pass-strength-result" aria-live="polite"></div>
				</div>
				<p><span class="description important hide-if-no-js">
				<strong><?php _e( 'Important:' ); ?></strong>
				<?php /* translators: The non-breaking space prevents 1Password from thinking the text "log in" should trigger a password save prompt. */ ?>
				<?php _e( 'You will need this password to log&nbsp;in. Please store it in a secure location.' ); ?></span></p>
			</td>
		</tr>
		<tr class="form-field form-required user-pass2-wrap hide-if-js">
			<th scope="row">
				<label for="pass2"><?php _e( 'Repeat Password' ); ?>
					<span class="description"><?php _e( '(required)' ); ?></span>
				</label>
			</th>
			<td>
				<input name="admin_password2" type="password" id="pass2" autocomplete="new-password" />
			</td>
		</tr>
		<tr class="pw-weak">
			<th scope="row"><?php _e( 'Confirm Password' ); ?></th>
			<td>
				<label>
					<input type="checkbox" name="pw_weak" class="pw-checkbox" />
					<?php _e( 'Confirm use of weak password' ); ?>
				</label>
			</td>
		</tr>
		<?php endif; ?>
		<tr>
			<th scope="row"><label for="admin_email"><?php _e( 'Your Email' ); ?></label></th>
			<td><input name="admin_email" type="email" id="admin_email" size="25" value="<?php echo esc_attr( $admin_email ); ?>" />
			<p><?php _e( 'Double-check your email address before continuing.' ); ?></p></td>
		</tr>
		<tr>
			<th scope="row"><?php has_action( 'blog_privacy_selector' ) ? _e( 'Site visibility' ) : _e( 'Search engine visibility' ); ?></th>
			<td>
				<fieldset>
					<legend class="screen-reader-text"><span><?php has_action( 'blog_privacy_selector' ) ? _e( 'Site visibility' ) : _e( 'Search engine visibility' ); ?> </span></legend>
					<?php
					if ( has_action( 'blog_privacy_selector' ) ) {
						?>
						<input id="blog-public" type="radio" name="blog_public" value="1" <?php checked( 1, $blog_public ); ?> />
						<label for="blog-public"><?php _e( 'Allow search engines to index this site' ); ?></label><br/>
						<input id="blog-norobots" type="radio" name="blog_public" value="0" <?php checked( 0, $blog_public ); ?> />
						<label for="blog-norobots"><?php _e( 'Discourage search engines from indexing this site' ); ?></label>
						<p class="description"><?php _e( 'Note: Neither of these options blocks access to your site &mdash; it is up to search engines to honor your request.' ); ?></p>
						<?php
						/** This action is documented in wp-admin/options-reading.php */
						do_action( 'blog_privacy_selector' );
					} else {
						?>
						<label for="blog_public"><input name="blog_public" type="checkbox" id="blog_public" value="0" <?php checked( 0, $blog_public ); ?> />
						<?php _e( 'Discourage search engines from indexing this site' ); ?></label>
						<p class="description"><?php _e( 'It is up to search engines to honor this request.' ); ?></p>
					<?php } ?>
				</fieldset>
			</td>
		</tr>
	</table>
	<p class="step"><?php submit_button( __( 'Install WordPress' ), 'large', 'Submit', false, array( 'id' => 'submit' ) ); ?></p>
	<input type="hidden" name="language" value="<?php echo isset( $_REQUEST['language'] ) ? esc_attr( $_REQUEST['language'] ) : ''; ?>" />
</form>
	<?php
} // End display_setup_form().