php – file_get_contents与相对路径

发布时间：2020-12-13 16:35:16 所属栏目：PHP教程来源：网络整理

导读：我有以下目录结构. /var/www/base/controller/detail.php/var/www/base/validate/edit.json/var/www/html 在/var/www/base/controller/detail.php中,如何使用相对路径的file_get_contents()读取/var/www/base/validate/edit.json？我尝试过以下操作： //fail

我有以下目录结构.

/var/www/base/controller/detail.php
/var/www/base/validate/edit.json
/var/www/html

在/var/www/base/controller/detail.php中,如何使用相对路径的file_get_contents()读取/var/www/base/validate/edit.json？我尝试过以下操作：

//failed to open stream: No such file or directory (error no: 2)
$json=file_get_contents('detail.php');

//No error,but I don't want this file and was just testing
$json=file_get_contents('detail.php',FILE_USE_INCLUDE_PATH);

//failed to open stream: No such file or directory (error no: 2)
$json=file_get_contents('./validate/edit.json',FILE_USE_INCLUDE_PATH);
//failed to open stream: No such file or directory (error no: 2)
$json=file_get_contents('../validate/edit.json',FILE_USE_INCLUDE_PATH);
//failed to open stream: No such file or directory (error no: 2)
$json=file_get_contents('././validate/edit.json',FILE_USE_INCLUDE_PATH);
//failed to open stream: No such file or directory (error no: 2)
$json=file_get_contents('../../validate/edit.json',FILE_USE_INCLUDE_PATH);

//This works,but I want to use a relative path
$json=file_get_contents(dirname(dirname(__FILE__)).'/validate/edit.json');

你有没有尝试过：

$json = file_get_contents(__DIR__ . '/../validate/edit.json');

__DIR__是一个有用的魔术常数.

为什么,见http://yagudaev.com/posts/resolving-php-relative-path-problem/

When a PHP file includes another PHP file which itself includes yet another file — all being in separate directories — using relative paths to include them may raise a problem. PHP will often report that it is unable to find the third file,but why? Well the answer lies in the fact that when including files in PHP the interpreter tries to find the file in the current working directory. In other words,if you run the script in a directory called A and you include a script that is found in directory B,then the relative path will be resolved relative to A when executing a script found in directory B. So,if the script inside directory B includes another file that is in a different directory,the path will still be calculated relative to A not relative to B as you might expect.

（编辑：李大同）

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