Ubuntu LAMP环境下PHP parse_ini_file与文件引入失效求助

Hey there! Let's break down why your parse_ini_file and require calls are failing—since your hardcoded credentials work perfectly, the issue is almost certainly tied to file permissions, PHP configuration restrictions, or a small oversight in how you're using the parse_ini_file function. Here's how to fix it step by step:

1. Fix File Permissions & Ownership First #

Apache runs as the www-data user on Ubuntu, so your db.ini file needs to be readable by this user, and locked down securely to prevent unauthorized access:

• Set the file's owner to www-data:

  sudo chown www-data:www-data /var/www/html/my_site/db.ini
  

• Restrict permissions so only the owner can read/write it (this is critical for security):

  sudo chmod 600 /var/www/html/my_site/db.ini
  

2. Add the Section Flag to parse_ini_file #

Your db.ini uses a [database] section, but the default parse_ini_file call ignores sections unless you pass true as the second parameter. That's probably why you're getting an empty result! Update your code to:

$config = parse_ini_file('/var/www/html/my_site/db.ini', true);
// Access values like this:
$db_host = $config['database']['host'];
$db_user = $config['database']['username'];
$db_pass = $config['database']['password'];
$db_name = $config['database']['dbname'];

3. Check PHP's open_basedir Restriction #

PHP's open_basedir setting limits which directories scripts can access. If your site's directory isn't in this list, parse_ini_file will fail silently:

• Create a temporary phpinfo.php file in your site directory:

  <?php phpinfo(); ?>
  

• Access it via your browser (e.g., http://your-domain/phpinfo.php) and search for the open_basedir entry.
• If /var/www/html/my_site isn't included, edit your Apache PHP config (usually at /etc/php/7.2/apache2/php.ini—adjust the version number if needed):

  open_basedir = /var/www/html/:/tmp/
  

• Restart Apache to apply changes:

  sudo systemctl restart apache2
  

4. Test for SELinux Restrictions (If Enabled) #

Ubuntu 18.04 disables SELinux by default, but if you've enabled it, it might block Apache from reading your config file:

• Temporarily disable SELinux to test:

  sudo setenforce 0
  

• If your script works now, apply a permanent SELinux rule to allow Apache access to your site directory:

  sudo chcon -Rv --type=httpd_sys_content_t /var/www/html/my_site/
  

• Restart Apache afterward.

5. Debug with Error Messages #

To get clear feedback on what's failing, add error checking to your code:

$config = parse_ini_file('/var/www/html/my_site/db.ini', true);
if ($config === false) {
    $error = error_get_last();
    echo "Failed to parse ini file: " . $error['message'];
    exit;
}

This will show you exactly why the function is failing (e.g., permission denied, invalid file format).

内容的提问来源于stack exchange，提问作者llLeoll