form-handling.php

<?php
    include 'forms/form--add-type.php';
    include 'forms/form--delete-type.php';
    include 'forms/form--add-data.php';
    include 'forms/form--delete-data.php';
    include 'forms/form--settings.php';

    function bp_validate_form_input( $post_data = [] ) {
        if ( ! isset( $post_data[ 'bp_date' ] ) || empty( $post_data[ 'bp_date' ] ) ) {
            return [
                'code'    => 'error_no_date',
                'message' => esc_html__( 'No date selected.', 'b3-assets-tracker' ),
            ];
        }
        if ( ! empty( $post_data[ 'bp_date' ] ) ) {
            $date_exists = bp_date_exists( $post_data[ 'bp_date' ] );

            if ( true === $date_exists ) {
                return [
                    'code'    => 'error_date_exists',
                    'message' => esc_html__( 'This date already exists, please edit the existing date.', 'b3-assets-tracker' ),
                ];
            }

        }


        return true;
    }