Custom registration forms

custom-registration-forms.php

/********* Custom Registration Form ***********/

add_action( 'register_form', 'travelnews_register_form' );

if (!function_exists('travelnews_register_form')) {
	function travelnews_register_form() {

	    $first_name = ( ! empty( $_POST['first_name'] ) ) ? trim( $_POST['first_name'] ) : '';
	    $last_name = ( ! empty( $_POST['last_name'] ) ) ? trim( $_POST['last_name'] ) : '';

	    ?>
	    <p>
	        <label for="first_name"><?php esc_html_e( 'First Name', 'travelnews' ) ?><br />
	            <input type="text" name="first_name" id="first_name" class="input" value="<?php echo esc_attr( wp_unslash( $first_name ) ); ?>" size="25" /></label>
	    </p>
	    <p>
	        <label for="last_name"><?php esc_html_e( 'Last Name', 'travelnews' ) ?><br />
	            <input type="text" name="last_name" id="last_name" class="input" value="<?php echo esc_attr( wp_unslash( $last_name ) ); ?>" size="25" /></label>
	    </p>
	    <?php
	}
}

add_filter( 'registration_errors', 'travelnews_registration_errors', 10, 3 );

if (!function_exists('travelnews_registration_errors')) {
	function travelnews_registration_errors( $errors, $sanitized_user_login, $user_email ) {

	    if ( empty( $_POST['first_name'] ) || ! empty( $_POST['first_name'] ) && trim( $_POST['first_name'] ) == '' ) {
	        $errors->add( 'first_name_error', esc_html__( '<strong>ERROR</strong>: You must include a first name.', 'travelnews' ) );
	    }

	    if ( empty( $_POST['last_name'] ) || ! empty( $_POST['last_name'] ) && trim( $_POST['last_name'] ) == '' ) {
	        $errors->add( 'last_name_error', esc_html__( '<strong>ERROR</strong>: You must include a last name.', 'travelnews' ) );
	    }

	    return $errors;
	}
}

add_action( 'user_register', 'travelnews_user_register' );

if (!function_exists('travelnews_user_register')) {
	function travelnews_user_register( $user_id ) {
		if ( ! empty( $_POST['first_name'] ) ) {
			update_user_meta( $user_id, 'first_name', trim( $_POST['first_name'] ) );
		}

		if ( ! empty( $_POST['last_name'] ) ) {
			update_user_meta( $user_id, 'last_name', trim( $_POST['last_name'] ) );
		}
	}
}