Sibyx/phpGPX

<?php
/**
 * Created            14/02/2017 18:45
 * @author            Jakub Dubec <jakub.dubec@gmail.com>
 */

namespace phpGPX\Helpers;

use phpGPX\Models\Summarizable;

/**
 * Class SerializationHelper
 * Contains basic serialization helpers used in summary() methods.
 * @package phpGPX\Helpers
 */
abstract class SerializationHelper
{

    /**
     * Returns integer or null.
     * @param $value
     * @return int|null
     */
    public static function integerOrNull($value)
    {
        return is_numeric($value) ? (integer) $value : null;
    }

    /**
     * Returns float or null.
     * @param $value
     * @return float|null
     */
    public static function floatOrNull($value)
    {
        return is_numeric($value) ? (float) $value : null;
    }

    /**
     * Returns string or null
     * @param $value
     * @return null|string
     */
    public static function stringOrNull($value)
    {
        return is_string($value) ? $value : null;
    }

    /**
     * Recursively traverse Summarizable objects and returns their array representation according summary() method.
     * @param Summarizable|Summarizable[] $object
     * @return array|null
     */
    public static function serialize($object)
    {
        if (is_array($object)) {
            $result = [];
            foreach ($object as $record) {
                $result[] = $record->toArray();
                $record = null;
            }
            $object = null;
            return $result;
        } else {
            return $object != null ? $object->toArray() : null;
        }
    }

    public static function filterNotNull(array $array)
    {
        foreach ($array as &$item) {
            if (!is_array($item)) {
                continue;
            }
            
            $item = self::filterNotNull($item);
        }

        $array = array_filter($array, function ($item) {
            return $item !== null && (!is_array($item) || count($item));
        });

        return $array;
    }
}