Ubuntu 14.04系统下为PHP 7.1安装phpredis的求助

Hey there, let's walk through getting phpredis properly installed and loaded for your setup. First, here's your PHP environment info for reference:

PHP 7.1.15-1+ubuntu14.04.1+deb.sury.org+2 (cli) (built: Mar 6 2018 11:51:39) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies
    with Xdebug v2.6.0, Copyright (c) 2002-2018, by Derick Rethans
    with Zend OPcache v7.1.15-1+ubuntu14.04.1+deb.sury.org+2, Copyright (c) 1999-2018, by Zend Technologies

You mentioned trying both PECL and manual installs—let's break down the critical steps for each that are easy to overlook, plus some troubleshooting tips.

PECL Installation: Verify Configuration & Loading #

You ran sudo pecl install redis and restarted php7.1-fpm, but extensions often fail to load because the PHP config isn't updated. Here's what to check:

• Add the extension to your PHP configs: After PECL finishes, it usually tells you to add extension=redis.so to your PHP ini files. Run php -i | grep "Loaded Configuration File" to find your CLI php.ini path. For PHP-FPM, look in /etc/php/7.1/fpm/php.ini or the conf.d subdirectory (creating a separate file like /etc/php/7.1/fpm/conf.d/20-redis.ini here is cleaner).
• Confirm the extension is loaded:
  • For CLI: Run php -m | grep redis—if you see redis printed, it's loaded.
  • For FPM: Create a simple phpinfo.php file with <?php phpinfo(); ?>, host it, and search for "redis" in the output. If it's missing, the FPM config wasn't updated or restarted properly.
• Check FPM logs: If restarting FPM didn't help, look at /var/log/php7.1-fpm.log for errors about missing redis.so or invalid paths.

Manual Compilation: Fix Common Pitfalls #

If the manual install from source didn't work, make sure you're using the correct tools for your PHP 7.1 setup:

• Install build dependencies first: You'll need development tools for PHP. Run sudo apt-get install php7.1-dev build-essential—this installs phpize, php-config, and compiler tools.
• Use the correct PHP 7.1 utilities: When compiling, specify the exact phpize and php-config for 7.1 to avoid targeting the wrong PHP version:

  phpize7.1
  ./configure --with-php-config=/usr/bin/php-config7.1
  make && sudo make install
  

• Same config step as PECL: After compiling and installing, add extension=redis.so to both CLI and FPM configs, then restart FPM.

Troubleshooting Common Issues #

• "redis.so not found" errors: Find your extension directory with php -i | grep extension_dir (it'll look like /usr/lib/php/20160303/ for PHP 7.1). Then update your ini file to use the full path: extension=/usr/lib/php/20160303/redis.so.
• Deb.sury.org source quirks: Ubuntu 14.04 with the sury repo sometimes has non-standard extension paths—always use php -i to confirm the correct directory instead of guessing.

内容的提问来源于stack exchange，提问作者Michael Millar