数组的简写:是否有像{}或[]这样的字面语法？

Question

PHP中数组表示法的简写是什么？

我试图使用(不起作用):

$list = {};

如果您提供有关PHP的其他缩写的一些信息的链接,那将是完美的.

Answer 1

更新:
从PHP 5.4.0 开始,引入了用于声明数组的缩写语法:

$list = [];

上一个答案:

There isn't. Only $list = array(); But you can just start adding elements.

<?php
$list[] = 1;
$list['myKey'] = 2;
$list[42] = 3;

It's perfectly OK as far as PHP is concerned. You won't even get a E_NOTICE for undefined variables.

E_NOTICE level error is issued in case of working with uninitialized variables, however not in the case of appending elements to the uninitialized array.

As for shorthand methods, there are lots scattered all over. If you want to find them just read The Manual.

Some examples, just for your amusement:

1. $arr[] shorthand for array_push.
2. The foreach construct
3. echo $string1, $string2, $string3;
4. Array concatenation with +
5. The existence of elseif
6. Variable embedding in strings, $name = 'Jack'; echo "Hello $name";

Answer 2

是的,它存在!!

从另一个Stack Overflow问题中提取:

数组的缩写语法已被重新讨论,接受,现在正在使用PHP 5.4发布

用法:

$list = [];

参考:PHP 5.4数组短手

Answer 3

也可以在[]中定义内容,如下所示:

  $array = ['vaue1', 'value2', 'key3'=>['value3', 'value4']];

这只适用于php5.4及以上版本.

Answer 4

PHP 5.3中没有.

http://us.php.net/manual/en/language.types.array.php