WordPress at a glance
function is not described

show_user_form() WP 3.0.0

Display user registration form

Hooks in function
Return

Nothing (null).

Usage

show_user_form( $user_name, $user_email, $errors );
$user_name(string)
The entered username.
Default: ''
$user_email(string)
The entered email address.
Default: ''
$errors(WP_Error/string)
A WP_Error object containing existing errors.
Default: empty string

Code of show user form: wp-signup.php VER 5.0.3

<?php
function show_user_form($user_name = '', $user_email = '', $errors = '') {
	if ( ! is_wp_error( $errors ) ) {
		$errors = new WP_Error();
	}

	// User name
	echo '<label for="user_name">' . __('Username:') . '</label>';
	if ( $errmsg = $errors->get_error_message('user_name') ) {
		echo '<p class="error">'.$errmsg.'</p>';
	}
	echo '<input name="user_name" type="text" id="user_name" value="'. esc_attr( $user_name ) .'" autocapitalize="none" autocorrect="off" maxlength="60" /><br />';
	_e( '(Must be at least 4 characters, letters and numbers only.)' );
	?>

	<label for="user_email"><?php _e( 'Email&nbsp;Address:' ) ?></label>
	<?php if ( $errmsg = $errors->get_error_message('user_email') ) { ?>
		<p class="error"><?php echo $errmsg ?></p>
	<?php } ?>
	<input name="user_email" type="email" id="user_email" value="<?php  echo esc_attr($user_email) ?>" maxlength="200" /><br /><?php _e('We send your registration email to this address. (Double-check your email address before continuing.)') ?>
	<?php
	if ( $errmsg = $errors->get_error_message('generic') ) {
		echo '<p class="error">' . $errmsg . '</p>';
	}
	/**
	 * Fires at the end of the user registration form on the site sign-up form.
	 *
	 * @since 3.0.0
	 *
	 * @param WP_Error $errors A WP_Error object containing 'user_name' or 'user_email' errors.
	 */
	do_action( 'signup_extra_fields', $errors );
}