那些遇到过的问题

PHP到root的绝对路径

SZT*_*SZT 40 php relative-path absolute-path

我无法相信PHP没有这个简单问题的简单解决方案.ASP.NET有一个关注此问题的标志,并从根级别开始.这是我的问题:

localhost/MySite
   -->Admin
      -- Edit.php
   -->Class
      -- class.EditInfo.php
   -->Texts
      -- MyInfo.txt
   --ShowInfo.php
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在class.EditInfo.php中我正在访问MyInfo.txt,所以我定义了一个相对路径"../Texts/MyInfo.txt".然后我在Admin/Edit.php中创建了一个EditInfo对象,并访问了Texts/MyInfo.txt它运行正常.

但是现在我必须在ShowInfo.php中创建一个EditInfo对象并访问Texts/MyInfo.txt,这就出现了问题.因为每当我创建一个objEditInfo并尝试访问MyInfo.txt时,我在我的类中使用相对路径,我得到"文件不存在"错误.

现在我正在寻找与ASP.NET的"〜/ Texts/MyInfo.txt"相当的东西.那里有什么类似的吗？或者我是否必须使用if/else条件设置路径？

更新:

我使用了$ _SERVER ['DOCUMENT_ROOT'].我正在使用我的实际网站所在的子文件夹.所以我不得不使用$ _SERVER ['DOCUMENT_ROOT']."/ mySite"然后添加其余的地址("/Texts/MyInfo.php").

Bes*_*nik 53

使用definein 创建一个具有root的绝对路径的常量ShowInfo.php:

define('ROOTPATH', __DIR__);
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或PHP <= 5.3

define('ROOTPATH', dirname(__FILE__));
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现在使用它:

if (file_exists(ROOTPATH.'/Texts/MyInfo.txt')) {
  // ...
}
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或者使用以下DOCUMENT_ROOT定义$_SERVER:

if (file_exists($_SERVER['DOCUMENT_ROOT'].'/Texts/MyInfo.txt')) {
  // ...
}
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  • 但这不会导致从 Admin/Edit.php 访问时失败吗？_ _ DIR _ _ 将指向 /path/to/site/Admin，因此它将尝试访问 /path/to/site/Admin/Texts，而不是 /path/to/site/texts。 (2认同)

Raz*_*van 30

在PHP中,有一个全局变量,包含与服务器相关的各种细节.它被称为$ _SERVER.它还包含根:

 $_SERVER['DOCUMENT_ROOT']
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唯一的问题是此变量中的条目由Web服务器提供,并且无法保证所有Web服务器都提供它们.

Joh*_*ers 6

始终最好使用引导程序文件启动任何自定义PHP项目，在该文件中，您根据从中提取的值将最常用的路径定义为常量$_SERVER。它应该使将项目或项目的部分迁移到另一台服务器或服务器上的另一目录变得容易得多。

这就是我定义根路径的方式：

define("LOCAL_PATH_ROOT", $_SERVER["DOCUMENT_ROOT"]);
define("HTTP_PATH_ROOT", isset($_SERVER["HTTP_HOST"]) ? $_SERVER["HTTP_HOST"] : (isset($_SERVER["SERVER_NAME"]) ? $_SERVER["SERVER_NAME"] : '_UNKNOWN_'));
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路径LOCAL_PATH_ROOT是文档根目录。HTTP_PATH_ROOT通过HTTP访问相同路径时，该路径是等效的。

此时，可以使用以下代码将任何本地路径转换为HTTP路径：

str_replace(LOCAL_PATH_ROOT, RELATIVE_PATH_ROOT, $my_path)
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如果要确保与基于Windows的服务器兼容，则还需要用URL分隔符替换目录分隔符：

str_replace(LOCAL_PATH_ROOT, RELATIVE_PATH_ROOT, str_replace(DIRECTORY_SEPARATOR, '/', $my_path))
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这是我用于PHP PowerTools样板的完整引导代码：

defined('LOCAL_PATH_BOOTSTRAP') || define("LOCAL_PATH_BOOTSTRAP", __DIR__);

// -----------------------------------------------------------------------
// DEFINE SEPERATOR ALIASES
// -----------------------------------------------------------------------
define("URL_SEPARATOR", '/');
define("DS", DIRECTORY_SEPARATOR);
define("PS", PATH_SEPARATOR);
define("US", URL_SEPARATOR);

// -----------------------------------------------------------------------
// DEFINE ROOT PATHS
// -----------------------------------------------------------------------
define("RELATIVE_PATH_ROOT", '');
define("LOCAL_PATH_ROOT", $_SERVER["DOCUMENT_ROOT"]);
define("HTTP_PATH_ROOT",
        isset($_SERVER["HTTP_HOST"]) ?
        $_SERVER["HTTP_HOST"] : (
        isset($_SERVER["SERVER_NAME"]) ?
        $_SERVER["SERVER_NAME"] : '_UNKNOWN_'));

// -----------------------------------------------------------------------
// DEFINE RELATIVE PATHS
// -----------------------------------------------------------------------
define("RELATIVE_PATH_BASE",
        str_replace(LOCAL_PATH_ROOT, RELATIVE_PATH_ROOT, getcwd()));
define("RELATIVE_PATH_APP", dirname(RELATIVE_PATH_BASE));
define("RELATIVE_PATH_LIBRARY", RELATIVE_PATH_APP . DS . 'vendor');
define("RELATIVE_PATH_HELPERS", RELATIVE_PATH_BASE);
define("RELATIVE_PATH_TEMPLATE", RELATIVE_PATH_BASE . DS . 'templates');
define("RELATIVE_PATH_CONFIG", RELATIVE_PATH_BASE . DS . 'config');
define("RELATIVE_PATH_PAGES", RELATIVE_PATH_BASE . DS . 'pages');
define("RELATIVE_PATH_ASSET", RELATIVE_PATH_BASE . DS . 'assets');
define("RELATIVE_PATH_ASSET_IMG", RELATIVE_PATH_ASSET . DS . 'img');
define("RELATIVE_PATH_ASSET_CSS", RELATIVE_PATH_ASSET . DS . 'css');
define("RELATIVE_PATH_ASSET_JS", RELATIVE_PATH_ASSET . DS . 'js');

// -----------------------------------------------------------------------
// DEFINE LOCAL PATHS
// -----------------------------------------------------------------------
define("LOCAL_PATH_BASE", LOCAL_PATH_ROOT . RELATIVE_PATH_BASE);
define("LOCAL_PATH_APP", LOCAL_PATH_ROOT . RELATIVE_PATH_APP);
define("LOCAL_PATH_LIBRARY", LOCAL_PATH_ROOT . RELATIVE_PATH_LIBRARY);
define("LOCAL_PATH_HELPERS", LOCAL_PATH_ROOT . RELATIVE_PATH_HELPERS);
define("LOCAL_PATH_TEMPLATE", LOCAL_PATH_ROOT . RELATIVE_PATH_TEMPLATE);
define("LOCAL_PATH_CONFIG", LOCAL_PATH_ROOT . RELATIVE_PATH_CONFIG);
define("LOCAL_PATH_PAGES", LOCAL_PATH_ROOT . RELATIVE_PATH_PAGES);
define("LOCAL_PATH_ASSET", LOCAL_PATH_ROOT . RELATIVE_PATH_ASSET);
define("LOCAL_PATH_ASSET_IMG", LOCAL_PATH_ROOT . RELATIVE_PATH_ASSET_IMG);
define("LOCAL_PATH_ASSET_CSS", LOCAL_PATH_ROOT . RELATIVE_PATH_ASSET_CSS);
define("LOCAL_PATH_ASSET_JS", LOCAL_PATH_ROOT . RELATIVE_PATH_ASSET_JS);

// -----------------------------------------------------------------------
// DEFINE URL PATHS
// -----------------------------------------------------------------------
if (US === DS) { // needed for compatibility with windows
    define("HTTP_PATH_BASE", HTTP_PATH_ROOT . RELATIVE_PATH_BASE);
    define("HTTP_PATH_APP", HTTP_PATH_ROOT . RELATIVE_PATH_APP);
    define("HTTP_PATH_LIBRARY", false);
    define("HTTP_PATH_HELPERS", false);
    define("HTTP_PATH_TEMPLATE", false);
    define("HTTP_PATH_CONFIG", false);
    define("HTTP_PATH_PAGES", false);
    define("HTTP_PATH_ASSET", HTTP_PATH_ROOT . RELATIVE_PATH_ASSET);
    define("HTTP_PATH_ASSET_IMG", HTTP_PATH_ROOT . RELATIVE_PATH_ASSET_IMG);
    define("HTTP_PATH_ASSET_CSS", HTTP_PATH_ROOT . RELATIVE_PATH_ASSET_CSS);
    define("HTTP_PATH_ASSET_JS", HTTP_PATH_ROOT . RELATIVE_PATH_ASSET_JS);
} else {
    define("HTTP_PATH_BASE", HTTP_PATH_ROOT .
            str_replace(DS, US, RELATIVE_PATH_BASE));
    define("HTTP_PATH_APP", HTTP_PATH_ROOT .
            str_replace(DS, US, RELATIVE_PATH_APP));
    define("HTTP_PATH_LIBRARY", false);
    define("HTTP_PATH_HELPERS", false);
    define("HTTP_PATH_TEMPLATE", false);
    define("HTTP_PATH_CONFIG", false);
    define("HTTP_PATH_PAGES", false);
    define("HTTP_PATH_ASSET", HTTP_PATH_ROOT .
            str_replace(DS, US, RELATIVE_PATH_ASSET));
    define("HTTP_PATH_ASSET_IMG", HTTP_PATH_ROOT .
            str_replace(DS, US, RELATIVE_PATH_ASSET_IMG));
    define("HTTP_PATH_ASSET_CSS", HTTP_PATH_ROOT .
            str_replace(DS, US, RELATIVE_PATH_ASSET_CSS));
    define("HTTP_PATH_ASSET_JS", HTTP_PATH_ROOT .
            str_replace(DS, US, RELATIVE_PATH_ASSET_JS));
}

// -----------------------------------------------------------------------
// DEFINE REQUEST PARAMETERS
// -----------------------------------------------------------------------
define("REQUEST_QUERY",
        isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] != '' ?
        $_SERVER["QUERY_STRING"] : false);
define("REQUEST_METHOD",
        isset($_SERVER["REQUEST_METHOD"]) ?
        strtoupper($_SERVER["REQUEST_METHOD"]) : false);
define("REQUEST_STATUS",
        isset($_SERVER["REDIRECT_STATUS"]) ?
        $_SERVER["REDIRECT_STATUS"] : false);
define("REQUEST_PROTOCOL",
        isset($_SERVER["HTTP_ORIGIN"]) ?
        substr($_SERVER["HTTP_ORIGIN"], 0,
        strpos($_SERVER["HTTP_ORIGIN"], '://') + 3) : 'http://');
define("REQUEST_PATH",
        isset($_SERVER["REQUEST_URI"]) ?
        str_replace(RELATIVE_PATH_BASE, '',
        $_SERVER["REQUEST_URI"]) : '_UNKNOWN_');
define("REQUEST_PATH_STRIP_QUERY",
        REQUEST_QUERY ?
        str_replace('?' . REQUEST_QUERY, '', REQUEST_PATH) : REQUEST_PATH);

// -----------------------------------------------------------------------
// DEFINE SITE PARAMETERS
// -----------------------------------------------------------------------
define("PRODUCTION", false);
define("PAGE_PATH_DEFAULT", US . 'index');
define("PAGE_PATH",
        (REQUEST_PATH_STRIP_QUERY === US) ?
        PAGE_PATH_DEFAULT : REQUEST_PATH_STRIP_QUERY);
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如果将上述代码添加到自己的项目中，此时将输出所有用户常量（您可以执行此操作，get_defined_constants(true)其结果应类似于以下内容：

array (
  'LOCAL_PATH_BOOTSTRAP' => '/var/www/libraries/backend/Data/examples',
  'URL_SEPARATOR' => '/',
  'DS' => '/',
  'PS' => ':',
  'US' => '/',
  'RELATIVE_PATH_ROOT' => '',
  'LOCAL_PATH_ROOT' => '/var/www',
  'HTTP_PATH_ROOT' => 'localhost:8888',
  'RELATIVE_PATH_BASE' => '/libraries/backend/Data/examples',
  'RELATIVE_PATH_APP' => '/libraries/backend/Data',
  'RELATIVE_PATH_LIBRARY' => '/libraries/backend/Data/vendor',
  'RELATIVE_PATH_HELPERS' => '/libraries/backend/Data/examples',
  'RELATIVE_PATH_TEMPLATE' => '/libraries/backend/Data/examples/templates',
  'RELATIVE_PATH_CONFIG' => '/libraries/backend/Data/examples/config',
  'RELATIVE_PATH_PAGES' => '/libraries/backend/Data/examples/pages',
  'RELATIVE_PATH_ASSET' => '/libraries/backend/Data/examples/assets',
  'RELATIVE_PATH_ASSET_IMG' => '/libraries/backend/Data/examples/assets/img',
  'RELATIVE_PATH_ASSET_CSS' => '/libraries/backend/Data/examples/assets/css',
  'RELATIVE_PATH_ASSET_JS' => '/libraries/backend/Data/examples/assets/js',
  'LOCAL_PATH_BASE' => '/var/www/libraries/backend/Data/examples',
  'LOCAL_PATH_APP' => '/var/www/libraries/backend/Data',
  'LOCAL_PATH_LIBRARY' => '/var/www/libraries/backend/Data/vendor',
  'LOCAL_PATH_HELPERS' => '/var/www/libraries/backend/Data/examples',
  'LOCAL_PATH_TEMPLATE' => '/var/www/libraries/backend/Data/examples/templates',
  'LOCAL_PATH_CONFIG' => '/var/www/libraries/backend/Data/examples/config',
  'LOCAL_PATH_PAGES' => '/var/www/libraries/backend/Data/examples/pages',
  'LOCAL_PATH_ASSET' => '/var/www/libraries/backend/Data/examples/assets',
  'LOCAL_PATH_ASSET_IMG' => '/var/www/libraries/backend/Data/examples/assets/img',
  'LOCAL_PATH_ASSET_CSS' => '/var/www/libraries/backend/Data/examples/assets/css',
  'LOCAL_PATH_ASSET_JS' => '/var/www/libraries/backend/Data/examples/assets/js',
  'HTTP_PATH_BASE' => 'localhost:8888/libraries/backend/Data/examples',
  'HTTP_PATH_APP' => 'localhost:8888/libraries/backend/Data',
  'HTTP_PATH_LIBRARY' => false,
  'HTTP_PATH_HELPERS' => false,
  'HTTP_PATH_TEMPLATE' => false,
  'HTTP_PATH_CONFIG' => false,
  'HTTP_PATH_PAGES' => false,
  'HTTP_PATH_ASSET' => 'localhost:8888/libraries/backend/Data/examples/assets',
  'HTTP_PATH_ASSET_IMG' => 'localhost:8888/libraries/backend/Data/examples/assets/img',
  'HTTP_PATH_ASSET_CSS' => 'localhost:8888/libraries/backend/Data/examples/assets/css',
  'HTTP_PATH_ASSET_JS' => 'localhost:8888/libraries/backend/Data/examples/assets/js',
  'REQUEST_QUERY' => false,
  'REQUEST_METHOD' => 'GET',
  'REQUEST_STATUS' => false,
  'REQUEST_PROTOCOL' => 'http://',
  'REQUEST_PATH' => '/',
  'REQUEST_PATH_STRIP_QUERY' => '/',
  'PRODUCTION' => false,
  'PAGE_PATH_DEFAULT' => '/index',
  'PAGE_PATH' => '/index',
)
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Jer*_*y D 5

您可以访问$_SERVER['DOCUMENT_ROOT']变量：

<?php 
   $path = $_SERVER['DOCUMENT_ROOT'];
   $path .= "/subdir1/yourdocument.txt";
?>
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