可选包含在PHP中 [英] Optional include in PHP

问题描述

我有一个配置文件，其中包含常规配置（在git repo中），以及一个覆盖配置属性的本地配置文件（在repo中忽略）。现在，本地配置文件包含在配置文件的开头：

I have a config file with the general configuration (in a git repo), and a local config file that overwrites configuration properties (ignored in the repo). Right now the local config file is included at the beginning of the config file:

include_once 'local_config.php';

但我希望include是有条件的：只有在文件local_config.php实际存在时才这样做。我可以毫不费力地在此输入链接说明 ，但首先我需要检查文件是否存在。所以我尝试了get_include_path（）但它返回了一个路径列表，我必须解析这个列表并检查每一个。

But I would like the include to be conditional: only do it if the file local_config.php actually exists. I can do a enter link description here without problems, but first I would need to check if the file exists. So I tried get_include_path() but it returns a list of paths, and I would have to parse this list and check for every one.

另一种选择就是调用include_once（）并禁止警告，但它甚至更加混乱。是否有更简单的方法在PHP中执行真正的可选包含？

Another option would be to just call include_once() and suppress the warnings, but it is even messier. Is there a simpler way to do a real optional include in PHP?

推荐答案

使用 file_exists（） 预定义的PHP函数如下：

Use the file_exists() predefined PHP function like so:

// Test if the file exists
if(file_exists('local_config.php')){
    // Include the file
    include('local_config.php');
}else{
    // Otherwise include the global config
    include('global_config.php');
}

此处的文档： http://php.net/manual/en/function.file-exists.php

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