php CLI模式-f标志 [英] php CLI mode -f flag

问题描述

我正在阅读有关CLI模式下PHP的详细信息，我无法为自己解释什么实用程序具有-f标志.

有可能以"php name_of_script.php" 或"php -f name_of_script.php"

的形式执行任何php脚本

我猜这个选项只是一种语法糖.也可以用以下事实来解释它的存在:对于用户而言，当他看到-f文件被执行时，这一点更加明显.我无法弥补其他任何解释.有人看到它的其他用法了吗?

解决方案

PHP已有很长的历史，许多设计决策在时间的迷茫中迷失了；我不确定任何人都可以告诉您 certain 为什么既有 -f 选项，又有没有任何选项就可以运行文件的能力.

但是，它显然是为用户方便而设计的.大多数命令行用户都希望解释器解释作为单个参数提供的文件名，这是最常见的用例，因此使其最快地键入是有意义的.我的猜测是，PHP CLI从 just 和 -f 选项开始，后来通过仅提供文件名来运行文件的选项被添加，以改善人们的生活.更轻松.保留 -f 是为了向后兼容.

我可以想到一种情况，其中 -f 选项很有用:如果文件名以连字符开头，例如-.php .

当作为单个参数提供时，将被视为选项，并且失败:

  $ php -.php用法:php [options] [-f]< file>[-] [args ...]php [选项] -r< code>[-] [args ...]php [选项] [-B< begin_code>] -R< code... 

但是，通过 -f ，它将起作用:

  $ php -f -.php<脚本执行成功> 

I was reading about specifics of PHP in CLI mode and I can't explain for myself what utility has -f flag.

It's possible execute any php script as "php name_of_script.php" or "php -f name_of_script.php"

I guess this option is just kind of syntactic sugar. Also its existence can be perhaps explained by the fact that it's more obvious for user when he sees -f that file is executed. I can't make up any other explanations. Do someone see any other usage of it?

解决方案

PHP has a very long history with a lot of the design decisions lost in the mists of time; I'm not sure anyone will be able to tell you for certain why there's both a -f option and the ability to run a file without any options at all.

However, it certainly seems designed for user convenience; most command line users would expect an interpreter to interpret a filename provided as a single parameter, and it's the most common use-case, so making it the quickest to type makes sense. My guess would be that the PHP CLI started off with just the -f option, and the option to run a file by providing just the filename was added later to make people's lives easier. The -f was retained for backwards compatibility.

I can think of one case where the -f option is useful: if the filename starts with a hyphen, for example -.php.

When provided as a single parameter, this will be treated as an option, and fail:

$ php -.php

Usage: php [options] [-f] <file> [--] [args...]
   php [options] -r <code> [--] [args...]
   php [options] [-B <begin_code>] -R <code
...

However, with -f, it'll work:

$ php -f -.php
<script executes successfully>

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