wp-tml-custom-field-registration.php

/*
1. create custom user fields with wordpress (see https://gist.github.com/makbeta/5851535 )
2. clone `register-form.php` from /wp-content/plugins/theme-my-login/templates to your theme
3. Add your new field to the registration template 
*/

    <p>
			<label for="subscription">Customer ID</label>
			<input type="text" name="subscription" id="subscription<?php $template->the_instance(); ?>" class="input" value="<?php $template->the_posted_value( 'subscription' ); ?>"  size="20" /><br />
			<span class="description">Please enter your customer ID.</span>
		</p>

/* Add handling of the field during registration by adding the following to your functions.php */
  <?php
    // This function can be used for validation such as required fields
	function my_registration_errors( $errors, $user_login ) {
		// Require "my-field"
		if ( empty( $_POST['subscription'] ) )
			$errors->add( 'empty_subscription', __( '"Customer ID" is a required field!' ) );
		return $errors;
	}
	

	// This function will save the custom field to the user meta table
	function my_new_user_registered( $user_id ) {
		if ( isset( $_POST['subscription'] ) )
			update_user_meta( $user_id, 'subscription', $_POST['subscription'] );
			
	}
  
  
  add_action( 'registration_errors', 'my_registration_errors', 10, 2 );
  add_action( 'tml_new_user_registered', 'my_new_user_registered' );
  
  ?>