Advanced Custom Fields get_field() sanitization

file.php

<?php
/**
 * Helper function to get sanitized field
 * and also normalize values.
 *
 * @param $field_key
 * @param bool $post_id
 * @param bool $format_value
 * @param string $sanitization_method esc_html / esc_attr or NULL for none
 * @return array|bool|string
 */
function get_field_sanitized($field_key, $post_id = false, $format_value = true, $sanitization_method = 'esc_html')
{
	$field = get_field($field_key, $post_id, $format_value);

	/* Check for null and falsy values and always return space */
	if($field === NULL || $field === FALSE)
		$field = '';

	/* Handle arrays */
	if(is_array($field))
	{
		$field_sanitized = array();
		foreach($field as $key => $value)
		{
			$field_sanitized[$key] = ($sanitization_method === NULL) ? $value : $sanitization_method($value);
		}
		return $field_sanitized;
	}
	else
		return ($sanitization_method === NULL) ? $field : $sanitization_method($field);
}