如何在php中打开linux文件？

Question

I'm trying to make an installer for my PHP project. I need to add the following block into <VirtualHost *:80>. Here is a part of my installer script:

<?php

$path = "/var/www/html/myProject";

$default_conf = shell_exec('cat /etc/apache2/sites-available/000-default.conf');

$new_directory = "<Directory $path/public>
                     Allow Override all
                     Require all granted
                  </Directory>";

$res = str_replace("</VirtualHost>","$new_directory</VirtualHost>", $default_conf);

file_put_contents("/etc/apache2/sites-available/000-default.conf",$res);

But $default_conf is empty. Why? How can I fix it?

---

Noted that the result of this command in the command line environment

cat /etc/apache2/sites-available/000-default.conf

is the content of 000-default.conf file which is exactly as expected (it is not empty).

Answer 1

You probably have a permissions problem with running the shell command.

Why not try the function file_get_contents which is simpler, safer and cross platform.

http://php.net/manual/en/function.file-get-contents.php

Further, you can use file_exists and is_readable to double check everything and help with debugging.