wasccwoocommercecustomfields

add_action( 'woocommerce_after_order_notes', 'my_custom_checkout_field' );

function my_custom_checkout_field( $checkout ) {

    woocommerce_form_field( 'date_of_birth', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'label'         => __('Date of Birth'),
        'placeholder'   => __('dd/mm/yyyy'),
        ), $checkout->get_value( 'date_of_birth' ));

    woocommerce_form_field( 'emergency_contact_name', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'label'         => __('Emergency Contact Name'),
        'placeholder'   => __('contact name'),
        ), $checkout->get_value( 'emergency_contact_name' ));

    woocommerce_form_field( 'relation', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'label'         => __('Emergency Relation'),
        'placeholder'   => __('wife/husband'),
        ), $checkout->get_value( 'relation' ));

    woocommerce_form_field( 'emergency_phone', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'label'         => __('Emergency Phone'),
        'placeholder'   => __('xxxx xxx xxx / xxxx xxxx'),
        ), $checkout->get_value( 'emergency_phone' ));

}

/**
 * Process the checkout
 */

add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');

function my_custom_checkout_field_process() {
    // Check if set, if its not set add an error.
    if ( ! $_POST['date_of_birth'] )
        wc_add_notice( __( 'Please enter your date of birth' ), 'error' );
    if ( ! $_POST['emergency_contact_name'] )
        wc_add_notice( __( 'Please enter your Emergency Contact Name' ), 'error' );
    if ( ! $_POST['relation'] )
        wc_add_notice( __( 'Please enter how your Emergency Contact is related to you' ), 'error' );
    if ( ! $_POST['emergency_phone'] )
        wc_add_notice( __( 'Please enter the phone number of your Emergency Contact' ), 'error' );
}

/**
 * Update the order meta with field value
 */
add_action( 'woocommerce_checkout_update_user_meta', 'my_custom_checkout_field_update_user_meta' );

function my_custom_checkout_field_update_order_meta( $order_id ) {
    if ( ! empty( $_POST['date_of_birth'] ) ) {
        update_user_meta( $user_id, 'Date Of Birth', sanitize_text_field( $_POST['date_of_birth'] ) );
    }
    if ( ! empty( $_POST['emergency_contact_name'] ) ) {
        update_user_meta( $user_id, 'Emergency Contact Name', sanitize_text_field( $_POST['emergency_contact_name'] ) );
    }
    if ( ! empty( $_POST['relation'] ) ) {
        update_user_meta( $user_id, 'Emergency Relation', sanitize_text_field( $_POST['relation'] ) );
    }
    if ( ! empty( $_POST['emergency_phone'] ) ) {
        update_user_meta( $user_id, 'Emergency Phone', sanitize_text_field( $_POST['emergency_phone'] ) );
    }
}