需要帮助解释 PHP 文件

发布于 2024-11-30 10:22:19 字数 836 浏览 0 评论 0原文

我有一个新项目，每个页面的开头都有一些代码。我需要澄清这一系列声明的作用。这是开场白：

<?php
session_start();
$levels = 1;
include("../Connections/main.php");
include("../queries.php");

我理解所有内容，除了 $levels = 1; 与 include("../queries.php"); 的关系

。 include("../queries.php"); 我看到它以以下语句开头：

<?php
switch($levels) {
case 1:
$dir = "../";
break;

case 2:
$dir = "../../";
break;


case 3:
$dir = "../../../";
break;

case 4:
$dir = "../../../../";
break;

case 5:
$dir = "../../../../../";
break;
}
function db_info($table,$where,$value,$info,$dir) {
//the functions just continue from there

这是我不遵循的部分。据我所知，有一个 switch 语句根据代码第一位中定义的 $levels 的值提供了 $dir 的几种情况。但是 $dir 值的这些不同输出如何转换？这是您以前见过或使用过的东西吗？ ../ 代表什么？谢谢。

原文

I have a new project that has a bit of code at the beginning of every page. I am in need of some clarification on what this series of statements do. Here is the opening call:

<?php
session_start();
$levels = 1;
include("../Connections/main.php");
include("../queries.php");

I understand all of it except how $levels = 1; relates to include("../queries.php");

When I look at include("../queries.php"); I see that it begins with the following statement:

<?php
switch($levels) {
case 1:
$dir = "../";
break;

case 2:
$dir = "../../";
break;


case 3:
$dir = "../../../";
break;

case 4:
$dir = "../../../../";
break;

case 5:
$dir = "../../../../../";
break;
}
function db_info($table,$where,$value,$info,$dir) {
//the functions just continue from there

This is the portion that I don't follow. I understand that there is a switch statement that offers several cases for $dir based upon the value of $levels which was defined in the first bit of code. But how do these different outputs for the $dir value translate? Is this something you've seen or used before? What does the ../ stand for? Thanks.

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篱下浅笙歌 2024-12-07 10:22:19

../../ 指的是父级的父级。 ETC。

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吝吻 2024-12-07 10:22:19

这是 ../ 始终引用 父目录，../ 越多，您获得的父目录就越多。有了足够的信息，您就可以到达文件系统的根目录（尽管您最好只使用 /）。这并不是实现这一目标的最佳方法。

$dir = str_repeat( '../', $level );

会更明显并且更具可扩展性。更好的选择仍然是拥有一些配置文件，它只需执行以下操作：

// obviously this would be a better constant name.
define( 'PATH_TO_STUFF', dirname( __FILE__ ) ); // use __DIR__ on PHP 5.>=3

额外信息：

./ =当前目录
../ =父目录
./ ../../ = 当前目录的祖父
./../../foo/../ 文件夹 foo 的父目录祖父母目录（即祖父母目录）。（我是你父亲、兄弟、侄子、表弟的前室友）
/ = 文件系统根目录。

This is a ../ always refers to parent directory, the more ../ the more parents you get. With enough you can get to the root of the file system (though you're better off just using /). This isn't exactly the best way to accomplish this.

$dir = str_repeat( '../', $level );

Would be more obvious and it would be more extensible. A better option still would be to have some config file which simply did something like:

// obviously this would be a better constant name.
define( 'PATH_TO_STUFF', dirname( __FILE__ ) ); // use __DIR__ on PHP 5.>=3

Bonus info:

./ = current directory
../ = parent directory
./../../ = grandparent of current directory
./../../foo/../ The parent directory of the folder foo in the grandparent directory (ie. the grandparent directory). (I am your father's, brother's, nephew's, cousin's former roommate)
/ = file system root directory.

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