<?php

/**
 * Copyright 1999-2021 iFLYTEK Corporation

 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace IFlytek\Xfyun\Core\Traits;

/**
 * 数组处理
 *
 * @author guizheng@iflytek.com
 */
trait ArrayTrait
{
    /**
     * 递归移除数组中的null项
     *
     * @param   array $array
     * @return  array
     */
    private static function removeNull($array)
    {
        foreach ($array as $key => $item) {
            if (is_array($item)) {
                $array[$key] = self::removeNull($item);
            } else if (is_null($item)) {
                unset($array[$key]);
            }
        }
        return $array;
    }
}