PHP7.2.x无openssl.so扩展问题求助

Hey there, let's work through this OpenSSL extension issue step by step for your setup. The core problem here is that system-level OpenSSL and PHP's OpenSSL extension are separate components—you've got the former installed, but the latter is missing or misconfigured. Let's fix this:

1. 先确认PHP 7.2的软件源（关键前提） #

Debian Jessie 8.6's default repos don't include PHP 7.2 (it only ships with PHP 5.6), so you must have used a third-party repo like Dotdeb to install PHP 7.2. First, make sure your repo config is correct:

• Check files in /etc/apt/sources.list or /etc/apt/sources.list.d/ to confirm you have a valid PHP 7.2 repo for Jessie. For example, Dotdeb's repo lines should look like:

  deb http://packages.dotdeb.org jessie all
  deb-src http://packages.dotdeb.org jessie all
  

• If you haven't added the repo's GPG key yet, run:

  wget https://www.dotdeb.org/dotdeb.gpg
  apt-key add dotdeb.gpg
  

• Update your repo cache: apt-get update

2. 安装PHP 7.2专属的OpenSSL扩展 #

PHP's OpenSSL extension is a standalone package—system OpenSSL won't cover this. Install it with:

apt-get install php7.2-openssl

This command will automatically place openssl.so in the correct extension directory (/usr/lib/php/20170718/ as you checked) and configure your php.ini file, so you won't need to manually add the extension line (though leaving it in won't hurt if the path is correct).

3. 验证扩展是否生效 #

• For the CLI environment: Run php -m | grep openssl—if you see openssl printed, the CLI side is working.
• For Apache's PHP environment: Create a file named info.php in your web root (e.g., /var/www/html/info.php) with this content:

  <?php phpinfo(); ?>
  

  Access this file via your browser, then search for "openssl". If you see a dedicated configuration block for OpenSSL, the Apache side is loading the extension correctly.

4. Double-check the extension_dir path in php.ini #

Sometimes an incorrect extension_dir setting can prevent PHP from finding the extension. Open /etc/php/7.2/apache2/php.ini and ensure this line is uncommented and points to the right directory:

extension_dir = "/usr/lib/php/20170718/"

Make sure the path matches exactly what you saw with your ls command.

5. Confirm Apache is using PHP 7.2 #

Verify that Apache has the PHP 7.2 module enabled:

a2query -m php7.2

If it returns php7.2 (enabled), you're good. If not, enable it with a2enmod php7.2 then restart Apache.

6. Check Apache error logs for clues #

If you're still stuck, look at Apache's error log (/var/log/apache2/error.log)—it will have specific details about why the extension isn't loading, like path mismatches or permission issues. Use those logs to narrow down the problem.

内容的提问来源于stack exchange，提问作者zewOlF