PHP include_once：处理导入，即配置文件 [英] PHP include_once: handling of imports i.e. for configuration files

问题描述

假设我们有以下结构：

index.php
config.inc.php
\ lib
\ lib \ common.php

数据库名称等几个参数，用户& co在 config.inc.php 中配置。访问它们的正确方法是什么，即从位于 \lib\common.php 中的函数。我真的必须在每个函数中执行 include_once（config.inc.php）吗？

Several parameters like database name, user & co are configured in config.inc.php. What is the proper way to access them i.e. from a function located in \lib\common.php. Do I really have to do an include_once("config.inc.php") within each function there?

如果出现以下情况似乎无效：

It doesn't seem to work if:

• config.inc.php 是在index.php中包含一次，包括 \lib\common.php 那里


• 如果 config.inc.php 在包含 \lib\common.php 和所有其他文件之前定义所有变量（这样我只需要在 index.php
$的所有中央文件中包含 config.inc.php b $ b
• 如果 config.inc.php 包含在 \lib\common.php <的顶部，它也不起作用/ code>



• config.inc.php is included once once in index.php, before including \lib\common.php there
• if config.inc.php defines all variables before including \lib\common.php and all other files (this way I would only have to include config.inc.php in all "central" files at the level of index.php
• neither does it work if config.inc.php is included at the top of \lib\common.php

非常感谢 - 我无法找到Google的解决方案！

Many thanks - I wasn't able to find a solution with Google!

解决方案

我包括 config.inc.php 一次在 index.php （由Galen建议）并使用全局（如David所建议）。一切都很好国王正如我所料，非常感谢！

I included config.inc.php once in index.php (as suggested by Galen) and used global (as suggested by David). Everything is working as I would expect it, many thanks!

稍后我肯定会按照n3rd的建议调查 auto_prepend ，tkx也是如此！

Later on I will definitely look into auto_prepend as suggested by n3rd, tkx for that as well!

推荐答案

你必须使用 global 关键字，用于访问在函数外定义的变量：

You have to use the global keyword to access variables which were defined outside of a function:

$var1 = "muh";
$var2 = "foo";

function test() {
    global $var1;
    echo "var1=$var1; var2=$var2\n";
}

将打印var1 = muh; var2 = 。

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