Any way to make mobile phone a required field on registration?

For further assistance, we suggest you refer to the instructions provided in the following thread: https://www.8theme.com/topic/registration-with-phone-number-on-woocommerce-my-account/. We believe this resource may guide you toward resolving the issue.

Currently, the error is visible on the main page https://dev.orinoco.ro/my-account/. As this page is part of WooCommerce, the issue may not be directly related to the theme activated on your site, suggesting a potential problem on WooCommerce’s end.

There is no problem with WC it is just that the code for adding a mobile phone (which I was testing via a plugin) adds new fields to the form but it had some problems. The code is literally from the same page mentioned in the thread you linked to, as luck would have it.

I figured out what was causing the error so it’s gone now and submission works and is saved, but there is one small problem with the code as in it only checks if the phone number is filled, but does not check for user inputting letters instead of numbers.

<?php

/**

* Plugin Name: Trickster Add mobile number to Woocommerce registration form

* Plugin URI: https://www.orinoco.ro/

* Description:  Add mobile number to Woocommerce registration form

* Version: 0.1

* Author: cloudways/Trickster

* Author URI: https://www.cloudways.com/

**/

/**
* https://www.cloudways.com/blog/add-woocommerce-registration-form-fields/
* 1. enable registration in admin
* 2. Add Custom Code in Functions.php File

*/

function wooc_extra_register_fields() {?>

       <p class="form-row form-row-wide">

       <label for="reg_billing_phone"><?php _e( 'Phone', 'woocommerce' ); ?></label>

       <input type="text" class="input-text" name="billing_phone" id="reg_billing_phone" value="<?php esc_attr_e( $_POST['billing_phone'] ); ?>" />

       </p>

       <p class="form-row form-row-first">

       <label for="reg_billing_first_name"><?php _e( 'First name', 'woocommerce' ); ?><span class="required">*</span></label>

       <input type="text" class="input-text" name="billing_first_name" id="reg_billing_first_name" value="<?php if ( ! empty( $_POST['billing_first_name'] ) ) esc_attr_e( $_POST['billing_first_name'] ); ?>" />

       </p>

       <p class="form-row form-row-last">

       <label for="reg_billing_last_name"><?php _e( 'Last name', 'woocommerce' ); ?><span class="required">*</span></label>

       <input type="text" class="input-text" name="billing_last_name" id="reg_billing_last_name" value="<?php if ( ! empty( $_POST['billing_last_name'] ) ) esc_attr_e( $_POST['billing_last_name'] ); ?>" />

       </p>

       <div class="clear"></div>

       <?php

 }

 add_action( 'woocommerce_register_form_start', 'wooc_extra_register_fields' );

/**

* 3. Validate Registration Form Fields

*/

/**

* register fields Validating.

*/

function wooc_validate_extra_register_fields( $username, $email, $validation_errors ) {

      if ( isset( $_POST['billing_first_name'] ) && empty( $_POST['billing_first_name'] ) ) {

      $validation_errors->add( 'billing_first_name_error', __( '<strong>Error</strong>: First name is required!', 'woocommerce' ) );

      }

      if ( isset( $_POST['billing_last_name'] ) && empty( $_POST['billing_last_name'] ) ) {

      $validation_errors->add( 'billing_last_name_error', __( '<strong>Error</strong>: Last name is required!.', 'woocommerce' ) );

      }
  return $validation_errors;
}

add_action( 'woocommerce_register_post', 'wooc_validate_extra_register_fields', 10, 3 );

/**
* 4: Save the Values into the Database
*/

/**

* Below code save extra fields.

*/

function wooc_save_extra_register_fields( $customer_id ) {

    if ( isset( $_POST['billing_phone'] ) ) {

   // Phone input filed which is used in WooCommerce

   update_user_meta( $customer_id, 'billing_phone', sanitize_text_field( $_POST['billing_phone'] ) );

   }

      if ( isset( $_POST['billing_first_name'] ) ) {

      //First name field which is by default

      update_user_meta( $customer_id, 'first_name', sanitize_text_field( $_POST['billing_first_name'] ) );

      // First name field which is used in WooCommerce

      update_user_meta( $customer_id, 'billing_first_name', sanitize_text_field( $_POST['billing_first_name'] ) );

      }

      if ( isset( $_POST['billing_last_name'] ) ) {

      // Last name field which is by default

      update_user_meta( $customer_id, 'last_name', sanitize_text_field( $_POST['billing_last_name'] ) );

      // Last name field which is used in WooCommerce

      update_user_meta( $customer_id, 'billing_last_name', sanitize_text_field( $_POST['billing_last_name'] ) );

      }

}

add_action( 'woocommerce_created_customer', 'wooc_save_extra_register_fields' );

Perhaps you would be so kind as to help out with that?
 
 

I know you can do it like this

 if ( ! (preg_match('/^[0-9]{10}$/D', $_POST['billing_phone'] ))){

        wc_add_notice( "Incorrect Phone Number! Please enter valid 10 digits phone number"  ,'error' );

but I don’t knpw how to “plug” that function n the code above.