A custom function designed to safely retrieve field values from the Advanced Custom Fields (ACF) plugin, ensuring seamless operation and preventing fatal errors in case of plugin deactivation. Additionally, it includes built-in functionality to display a site notice, alerting administrators if the ACF plugin is disabled.

acf_get_field.php

  <?php
/**
 * Retrieves a custom field value using Advanced Custom Fields (ACF) plugin.
 *
 * @param string $field_name The name of the ACF field.
 * @param array  $options    Optional. An array of options to pass to the `get_field()` function. Default is an empty array.
 * @return mixed The value of the ACF field, or an empty string if ACF plugin is disabled.
 */
function custom_get_acf_field($field_name,  $options = '') {
	if ( function_exists('get_field') ) {
		// ACF function exists, so it's safe to use
		return get_field($field_name, $options);
	} else {
		// ACF plugin is not active, display a notice
		add_action('admin_notices', 'custom_acf_plugin_disabled_notice');
		return ''; // or any default value you prefer
	}
}

/**
 * Displays an error notice when the ACF plugin is disabled.
 */
function custom_acf_plugin_disabled_notice() {
	?>
    <div class="notice notice-error">
        <p><?php esc_html_e('The Advanced Custom Fields plugin is currently disabled. Please enable it to use this feature.', 'TEXT_DOMAIN'); ?></p>
    </div>
	<?php
}