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PHP ​

FlashPanel makes it easy to toggle the default version for the server, set maximum file upload size, maximum execution time, and enable/disable OPCache.

! Install PHP manually

If you choose to manually install PHP versions on your server, FlashPanel will not know about those PHP settings. FlashPanel only knows about PHP settings managed through the FlashPanel control panel.

Multiple PHP Versions ​

When creating a server, you must decide which version of PHP you want to install as the default version. The PHP CLI on your server will point to the installed version selected at creation time.

Once the server has been created, FlashPanel makes it easy to install additional instances alongside the default instance. In the following document, we will discuss how to manage these additional PHP versions.

PHP-FPM Pool Management with Multi-User and Multi-Version ​

FlashPanel manages PHP using a separate PHP Pool for each user and each PHP version model. This ensures maximum isolation and security between users on the same server.

📊 Architecture Diagram ​

┌─────────────────────────────────────────────────────────────────┐
│                         Server                                  │
│                                                                 │
│  ┌──────────────┐                    ┌──────────────┐           │
│  │  System User │                    │  System User │           │
│  │     abc      │                    │     xyz      │           │
│  └──────────────┘                    └──────────────┘           │
│         │                                    │                  │
│         │                                    │                  │
│  ┌──────▼──────────────────┐        ┌───────▼─────────────────┐ │
│  │     PHP 8.0             │        │     PHP 8.0             │ │
│  │  www-abc.conf           │        │  www-xyz.conf           │ │
│  │  listen: /run/php/      │        │  listen: /run/php/      │ │
│  │    php8.0-fpm-abc.sock  │        │    php8.0-fpm-xyz.sock  │ │
│  │  user: abc              │        │  user: xyz              │ │
│  │  group: abc             │        │  group: xyz             │ │
│  └─────────────────────────┘        └─────────────────────────┘ │
│                                                                 │
│  ┌─────────────────────────┐        ┌─────────────────────────┐ │
│  │     PHP 8.4             │        │     PHP 8.4             │ │
│  │  www-abc.conf           │        │  www-xyz.conf           │ │
│  │  listen: /run/php/      │        │  listen: /run/php/      │ │
│  │    php8.4-fpm-abc.sock  │        │    php8.4-fpm-xyz.sock  │ │
│  │  user: abc              │        │  user: xyz              │ │
│  │  group: abc             │        │  group: xyz             │ │
│  └─────────────────────────┘        └─────────────────────────┘ │
│                                                                 │
└─────────────────────────────────────────────────────────────────┘

Formula: Total Pools = Number of Users × Number of PHP Versions
Example: 2 users × 2 PHP versions = 4 pools

🔍 Detailed Explanation ​

1. Pool Directory Structure

Each PHP version has its own pool directory:

  • PHP 8.0: /etc/php/8.0/fpm/pool.d/
  • PHP 8.4: /etc/php/8.4/fpm/pool.d/

2. Pool File Naming

Format: www-{username}.conf

  • User abc + PHP 8.0 → /etc/php/8.0/fpm/pool.d/www-abc.conf
  • User xyz + PHP 8.0 → /etc/php/8.0/fpm/pool.d/www-xyz.conf
  • User abc + PHP 8.4 → /etc/php/8.4/fpm/pool.d/www-abc.conf
  • User xyz + PHP 8.4 → /etc/php/8.4/fpm/pool.d/www-xyz.conf

3. Separate Unix Sockets

Each pool listens on its own socket:

  • Format: /run/php/php{version}-fpm-{username}.sock
  • Examples:
    • /run/php/php8.0-fpm-abc.sock
    • /run/php/php8.0-fpm-xyz.sock
    • /run/php/php8.4-fpm-abc.sock
    • /run/php/php8.4-fpm-xyz.sock

4. Ownership

Each pool runs with its own user permissions:

  • Pool for user abc: user = abc, group = abc
  • Pool for user xyz: user = xyz, group = xyz

5. Benefits of This Model

✅ High Security: User abc cannot access user xyz's files
✅ Complete Isolation: Error in one pool doesn't affect other pools
✅ Flexibility: Each site can run different PHP versions
✅ Performance: Easy to adjust resources for each pool
✅ Easy Management: Can restart individual pools without affecting the entire system

6. Real-World Example

Server with:

  • 3 system users: user1, user2, user3
  • 3 PHP versions: 8.0, 8.2, 8.4

Total pools created: 3 users × 3 versions = 9 pools

/etc/php/8.0/fpm/pool.d/www-user1.conf
/etc/php/8.0/fpm/pool.d/www-user2.conf
/etc/php/8.0/fpm/pool.d/www-user3.conf
/etc/php/8.2/fpm/pool.d/www-user1.conf
/etc/php/8.2/fpm/pool.d/www-user2.conf
/etc/php/8.2/fpm/pool.d/www-user3.conf
/etc/php/8.4/fpm/pool.d/www-user1.conf
/etc/php/8.4/fpm/pool.d/www-user2.conf
/etc/php/8.4/fpm/pool.d/www-user3.conf

Setting ​

PHP Setting

You can install additional PHP versions through the Applications tab on the server's management console. Once an additional PHP version has been installed, you can select it when creating a website or when switching the PHP version of a website.

When you install a new PHP version to your server, FlashPanel creates and configures the PHP-FPM process for that version. This means your server will be running multiple versions of PHP at the same time.

Uninstall ​

You can uninstall PHP versions through the Applications tab on the server's management console. You can choose to uninstall the PHP version as long as:

  • There are other versions installed.
  • The version you want to uninstall is not the server's default version for new sites.
  • The version you want to uninstall is not the server's default version on CLI.
  • The version you want to uninstall is not used by any website.

Install PHPRedis with igbinary and zstd + lz4 ​

WARNING

OpenLiteSpeed ​​does not apply

  • Go to Application > PHP and install extension php8.2-redis, php8.2-igbinary, php8.2-lz4.

  • Go to Server > Terminal (root user) and run the command

    bash
    apt update && apt install liblz4-dev libzstd-dev
pecl uninstall redis
pecl install --configureoptions 'enable-redis-igbinary="yes" enable-redis-zstd="yes" enable-redis-lz4="yes"' redis

    It will report an error related to php_ini but can be ignored.

    Check the results with the command php -ri redis

    The result as shown in the picture is ok.

Those who run multiple sites sharing the same Redis instance, especially 'Wordpress' and 'Woocommerce' sites, should consider turning on compression for more optimization.

PHP Management & Configuration ​

PHP Setting

WARNING

Changing the following settings will apply the changes to all PHP versions installed on the server.

IonCube Loader ​

This feature allows you to install IonCube Loader for the PHP version you want.

When you click on the IonCube Loader feature block, you will see the PHP versions that support IonCube Loader and their installation status. You can click the install or uninstall button to manage IonCube Loader as desired.

Switch PHP Default Version ​

The 'default' PHP version is the PHP version that will be used by default when creating a new website on the server. Conversion steps:

  1. At the server management console > Select PHP Default Version
  2. Select the PHP version you want to transfer
  3. Select Update

When selecting a new PHP version as the 'default' version for your server, PHP versions used by existing websites will not be updated.

Maximum file upload size ​

You can configure the maximum file upload size in the server management console. Values ​​are provided in megabytes. For reference, 1024MB is 1GB.

Maximum execution time ​

You can configure the maximum execution time at the server management console. The value provided is in seconds.

OPcache ​

OPcache is a bytecode caching technology that helps speed up PHP application execution. Every time a PHP script is executed, PHP needs to compile the script into bytecode. OPcache stores this bytecode in memory, allowing subsequent executions to skip recompilation, saving time and making your application run significantly faster.

Enable/Disable OPcache ​

You can enable or disable OPcache directly from the server management console:

  1. In the server management console, navigate to the PHP section
  2. Select the OPcache feature
  3. The screen displays information about OPcache and its current status (enabled or disabled)
  4. Click the Enable button to activate OPcache, or the Disable button to deactivate OPcache
  5. The system will automatically configure and restart the PHP-FPM service

Important Note

If you enable OPcache for a production environment, you should ensure that your deployment script restarts the PHP-FPM service at the end of each deployment. This ensures that OPcache is refreshed and uses the latest code.

Advanced OPcache Configuration ​

In addition to enabling/disabling OPcache, you can customize OPcache parameters in the Update PHP.ini Configuration section below.

Update PHP.ini Configuration ​

You no longer need to access SSH or manually edit complex configs php ini.

✅ Now you can edit your PHP settings directly from the web interface with just a few clicks.

🎯 What Can This Feature Help You With? ​

  • ✅ Change PHP settings easily without needing programming skills.
  • ✅ No more opening terminal windows or editing config files.
  • ✅ Friendly interface with clear descriptions.
  • ✅ Changes apply to both:
    • PHP for websites (PHP-FPM)
    • PHP for command-line tools (CLI)

🖱️ How to Use It ​

  1. Go to PHP Settings section panel.

  2. Click the Recommend button to automatically apply security best practices

    • This will set secure default values for all SSH configuration options
    • Perfect for users who want enhanced security without manual configuration
    • You can still adjust individual settings after applying recommendations

  3. Or modify the sections below as needed:

    The system manages the following php ini configuration options:

    • memory_limit: Maximum memory limit that a script can utilize
    • max_execution_time: Maximum execution time in seconds allowed for a script before termination
    • max_input_time: Time limit in seconds for parsing input data such as POST and GET requests
    • max_input_vars: Maximum limit of input variables permitted per request
    • upload_max_filesize: Maximum file size limit (Megabytes) for file uploads
    • post_max_size: Maximum POST data size that PHP can process
    • display_errors: Controls whether PHP errors are displayed in the browser
    • error_reporting: Sets which PHP errors are reported
    • date.timezone: Default timezone setting for PHP
    • session.gc_maxlifetime: Maximum idle time in seconds for a session before being cleaned up by garbage collector
    • disable_functions: List of PHP functions that are disabled for security reasons
    • opcache.enable: Activates PHP OPCache to significantly boost performance by caching compiled scripts in shared memory
    • opcache.memory_consumption: Amount of memory (RAM) allocated for OPcache to store compiled PHP code
    • opcache.interned_strings_buffer: Memory allocated for storing interned strings to optimize PHP performance
    • opcache.max_accelerated_files: Maximum limit of PHP files that can be accelerated by OPcache
    • opcache.validate_timestamps: Whether to automatically detect source code changes for cache refresh
    • opcache.save_comments: Whether to preserve comments in the compiled bytecode cache

Every setting comes with a short, helpful explanation right in the UI.

💡 Notes ​

  • The system will automatically apply new settings after you update.
  • Use the Reload button to get the new values applied.
  • If something doesn’t work as expected, please contact us.