为什么这会导致PhP出现语法错误？

Question

  private static $columns = [
      self::COUNTRY_CODE         => [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8],
      self::COUNTRY_NAME         => [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8],
      self::REGION_NAME          => [0, 0, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12],
      self::CITY_NAME            => [0, 0, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16],
      self::LATITUDE             => [0, 0, 0, 0, 20, 20, 0, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20],
      self::LONGITUDE            => [0, 0, 0, 0, 24, 24, 0, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24],
      self::ISP                  => [0, 12, 0, 20, 0, 28, 20, 28, 0, 32, 0, 36, 0, 36, 0, 36, 0, 36, 28, 36, 0, 36, 28, 36],
      self::DOMAIN_NAME          => [0, 0, 0, 0, 0, 0, 24, 32, 0, 36, 0, 40, 0, 40, 0, 40, 0, 40, 32, 40, 0, 40, 32, 40],
      self::ZIP_CODE             => [0, 0, 0, 0, 0, 0, 0, 0, 28, 28, 28, 28, 0, 28, 28, 28, 0, 28, 0, 28, 28, 28, 0, 28],
      self::TIME_ZONE            => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 32, 28, 32, 32, 32, 28, 32, 0, 32, 32, 32, 0, 32],
      self::NET_SPEED            => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 44, 0, 44, 32, 44, 0, 44, 0, 44, 0, 44],
      self::IDD_CODE             => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 48, 0, 48, 0, 48, 36, 48, 0, 48],
      self::AREA_CODE            => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, 52, 0, 52, 0, 52, 40, 52, 0, 52],
      self::WEATHER_STATION_CODE => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 56, 0, 56, 0, 56, 0, 56],
      self::WEATHER_STATION_NAME => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, 60, 0, 60, 0, 60, 0, 60],
      self::MCC                  => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 64, 0, 64, 36, 64],
      self::MNC                  => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, 68, 0, 68, 40, 68],
      self::MOBILE_CARRIER_NAME  => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 44, 72, 0, 72, 44, 72],
      self::ELEVATION            => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 44, 76, 0, 76],
      self::USAGE_TYPE           => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48, 80],
  ];

我在https://www.ip2location.com/developers/php上下载IP2Location。PhP模块就是这样的。

它会导致语法错误。

这是一个新的语法，适用于PhP 5，而不是下面的，还是什么？

Answer 1

是一种适用于PhP 5的新语法，而不是下面的语法吗？

是的，这是用于+的简短数组语法

从手册中引用

PHP5.4.0提供了一系列新特性：

其中之一就是

添加了

短数组语法，例如$a = 1，2，3，4；或$a = 'one‘=> 1，'two’=> 2，'three‘=> 3，'four’=> 4；。

Answer 2

从PHP5.4开始，您还可以使用短数组语法，它将array()替换为[]。

示例#1简单的数组

 <?php
 $array = array(
     "foo" => "bar",
     "bar" => "foo",
);

//自PHP 5.4起

 $array = [
    "foo" => "bar",
    "bar" => "foo",
 ];
 ?>