多维数组拼接成字符串

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多维数组拼接成字符串
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/**
 * @FuncName:arrayToString
 * @Description 数组拼接成字符串
 * @User ZHaoGuiBin
 * @Date 2020-08-14 9:17
 * @param $data
 * @param string $keys
 * @param string $key_1 //多维数组主key
 * @param string $string
 * @return string
 */
private static function arrayToString($data, $keys = '', $string = '', $key_1 = '')
{
    $temp = 0;
    foreach ($data as $key => $value) {
        if (is_array($value)) {
            if (!is_numeric($key)) {
                $key_1 = $key;
                $string .= $key_1 . '=';
            }
            $string .= self::arrayToString($value, $key, '', $key_1);
        } else {
            if ($keys) {
                if (is_numeric($key)) {
                    if ($temp == 0) {
                        $string .= $keys . '=' . $value;
                        $temp++;
                    } else {
                        $string .= '&' . $value . '&';
                    }
                } else {
                    if ($temp == 0) {
                        if (!is_numeric($keys)) {
                            $string .= $keys . '=' . $key . '=' . $value . '&';
                            $temp++;
                        } else {
                            $string .= $key . '=' . $value . '&';
                            $temp++;
                        }

                    } else {
                        $string .= $key . '=' . $value . '&';
                    }
                }
            } else {
                $string .= $key . '=' . $value . '&';
            }
        }
    }
    return $string;
}