Different chunks for DB navigation

chunk.php

<?php 

	/**
	 * Special implementation of chunk
	 * Used in case when records' count depends on dynamic condition and decreases during performing to zero
	 * In this way default chunk of query builder can't work correctly
	 * @param $query
	 * @param $callback
	 */
	private function chunkForDecreasesCollection($query, $callback)
	{
		while ($query->count() > 0) {
			$entities = $query->take($this->chunkSize)->get();
			foreach ($entities as $entity) {
				$callback($entity);
			}
		}
	}


	/**
	 * Custom implementation of chunk
	 * @param $query
	 * @param $callback
	 */
	private function chunk($query, $callback)
	{
		$step = $this->chunkSize;
		$count = $query->count();

		for ($i = 0; $i < $count; $i += $step) {
			$entities = $query->skip($i)->take($step)->get();

			foreach ($entities as $entity) {
				$callback($entity);
			}
		}
	}