src/Collection.php
public function filter(\Closure $callback)
    {
        $offsetToRemove = [];
        foreach ($this as $offset => $entity) {
            if (!$callback($entity)) {
                $offsetToRemove[] = $offset;
            }
        }
        $this->offsetUnset($offsetToRemove);
        return $this;
    }
public function filter(\Closure $callback)
    {
        $offsetToRemove = [];
        foreach ($this as $offset => $entity) {
            if (!$callback($entity)) {
                $offsetToRemove[] = $offset;
            }
        }
        $this->offsetUnset($offsetToRemove);
        return $this;
    }
Filter collection from entities not matching criteria given in callback

@param \Closure $callback callback

@return static