本文介绍了PHP 保留字作为命名空间和类名的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

最近我开始将我的框架转换为使用 php 命名空间,但我似乎找不到答案的一个问题是 - 使用保留字如对象"、数组"是否合法", 'String' 作为该命名空间内的命名空间和类名?一个例子是:

Recently I've started converting my framework to use the php namespaces and one question to which I can't seem to find the answer is - is it 'legal' to use reserved words such as 'Object', 'Array', 'String' as namespace and class name within that namespace? An example would be:

namespace SystemObject;


class String { }

class Array { }

推荐答案

PHP 会抛出如下错误:

PHP will throw an error like:

Parse error: syntax error, unexpected T_ARRAY, expecting T_STRING

如果你尝试:

class Array
{

}
$myClass = new Array;

相反,尝试类似

class myArray
{

}
$myClass = new myArray;

[edit] 我会详细说明一下,它们被保留是有原因的,因为在上面的第一个场景中,PHP 无法区分你定义一个数组或初始化一个类同名,所以会报错.没有办法像在 MySQL 中那样解决这个问题,例如,您可以使用反引号来转义保留字.所以在 PHP 中你不得不改变名字,你不必改变太多,只要你不使用与保留字完全相同的名字,一个字符就可以了.

[edit] I'll elaborate on that a little, they're reserved for a reason because in the first scenario above, PHP wouldn't be able to tell the difference between you defining an array or initialising a class of the same name, so it throws an error. There's no way round this like in MySQL, for example, where you can escape reserved words with a backtick. So in PHP you're forced to change the name, you don't have to change it much, one char will do as long as you're not using the exact same name as a reserved word.

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08-04 16:53
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