picandocodigo/List-Category-Posts

<?php
class LcpUtils{
  private $params;

  public function __construct($params){
    $this->params = $params;
  }
  /**
   * Check for empty parameters (being empty strings or zero).
   */
  public function lcp_not_empty($param){
    return (
      isset($this->params[$param]) &&
      !empty($this->params[$param]) &&
      $this->params[$param] !== '0' &&
      $this->params[$param] !== ''
    );
  }

  public static function lcp_orders(){
    return array("date" => __("Date", "list-category-posts"),
                 "modified" => __("Modified Date", "list-category-posts"),
                 "title" => __("Post title", "list-category-posts"),
                 "author" => __("Author", "list-category-posts"),
                 "ID" => __("ID", "list-category-posts"),
                 "rand" => __("Random", "list-category-posts"));
  }

  public static function lcp_show_pagination($pagination){
    return (!empty($pagination) && (
            $pagination == 'yes' ||
            $pagination == 'true')
           )
           ||
           (get_option('lcp_pagination') === 'true' &&
            ($pagination !== 'false') &&
            ($pagination !== 'no')
           );
  }

  public static function lcp_format_customfield($type) {
    $format = null;
    switch ($type) {
      case 'DATETIME':
        $format = 'c';
        break;
      case 'DATE':
        $format = 'Y-m-d';
        break;
      case 'TIME':
        $format = 'H:i:s';
    }

    return function($value) use ($format) {
      // When necessary, format the string, if not
      // return it as is.
      if ($format) return date($format, strtotime($value));
      return $value;
    };
  }

  // Adapted from a comment on https://developer.wordpress.org/reference/functions/sanitize_html_class/
  public static function sanitize_html_classes($classes, $sep = " ") {
    if(!is_array($classes)) {
      $classes = explode($sep, $classes);
    }

    $classes = array_map('sanitize_html_class', $classes);

    return implode(' ', $classes);
  }
}