WordPress CPT, Term & Options page helpers

functions.php

<?php
/**
 * Functions and definitions
 *
 * @package Theme
 * @since 1.0.0
 */

use functions Theme\Helpers\{
  get_current_options_slug,
  get_current_cpt_slug,
  get_current_taxonomy_slug,
};

require_once get_theme_file_path( 'includes/helpers.php' );

add_action( 'init', 'theme_require_custom_fields' );
/**
 * Conditionally requires files for custom fields.
 */
function theme_require_custom_fields() {
  $options_slug  = get_current_options_slug();
  $cpt_slug      = get_current_cpt_slug();
  $taxonomy_slug = get_current_taxonomy_slug();
  
  if ( 'creator' === $taxonomy_slug ) {
    require_once get_theme_file_path( 'includes/acf/taxonomy-creator.php' );
  }

  if ( is_customize_preview() ) {
    require_once get_theme_file_path( 'includes/customize.php' );;
  }
  
  if ( 'lecture' === $cpt_slug ) {
    require_once get_theme_file_path( 'includes/acf/cpt-lecture.php' );
  }
  
  if ( 'rgbc_options' === $options_slug ) {
    require_once get_theme_file_path( 'includes/acf/options.php' );
  }
}

helpers.php

<?php
/**
 * Utility functions that help the developmnet process
 *
 * @package Theme
 */

namespace Theme\Helpers;

/**
 * Returns current options page slug if is in view
 *
 * @since 1.0.0
 *
 * @return string
 */
function get_current_options_slug(): string {
	if ( ! is_admin() ) {
		return '';
	}

	$http_get = wp_unslash( $_GET ); // phpcs:ignore
	if ( ! isset( $http_get['page'] ) ) {
		return '';
	}

	$current_page_slug = sanitize_text_field( $http_get['page'] );
	if ( ! empty( $current_page_slug ) ) {
		return $current_page_slug;
	}

	return '';
}

/**
 * Returns current post type slug if is in view
 *
 * @since 1.0.0
 *
 * @return string
 */
function get_current_cpt_slug(): string {
	global $pagenow;

	$http_get = wp_unslash( $_GET ); // phpcs:ignore
	if ( ! is_admin() || empty( $http_get ) ) {
		return '';
	}

	if ( 'post.php' === $pagenow ) {
		if ( ! isset( $http_get['post'] ) ) {
			return '';
		}

		$current_post_id   = (int) $http_get['post'];
		$current_post_type = get_post_type( $current_post_id );

		if ( ! empty( $current_post_type ) ) {
			return $current_post_type;
		}
	} elseif ( 'post-new.php' === $pagenow ) {
		if ( ! isset( $http_get['post_type'] ) ) {
			return '';
		}

		$current_post_type = sanitize_text_field( $http_get['post_type'] );
		if ( ! empty( $current_post_type ) ) {
			return $current_post_type;
		}
	}

	return '';
}

/**
 * Returns current taxonomy slug if is in view
 *
 * @since 1.0.0
 *
 * @param string $taxonomy Optional. Taxonomy name.
 *
 * @return string
 */
function get_current_taxonomy_slug(): string {
	if ( ! is_admin() ) {
		return '';
	}

	$http_get         = wp_unslash( $_GET ); // phpcs:ignore
	$current_taxonomy = '';

	if ( isset( $http_get['taxonomy'] ) ) {
		$current_taxonomy = sanitize_text_field( $http_get['taxonomy'] );
	} else {
		$http_post = wp_unslash( $_POST ); // phpcs:ignore

		if ( isset( $http_post['taxonomy'] ) ) {
			$current_taxonomy = sanitize_text_field( $http_post['taxonomy'] );
		}
	}

	if ( ! empty( $current_taxonomy ) ) {
		return $current_taxonomy;
	}
	return '';
}