CascadiaPHP 2024

LiteSpeed Web Server/OpenLiteSpeed Web Server on Unix systems

LiteSpeed PHP is an optimized compilation of PHP built to work with LiteSpeed products through the LiteSpeed SAPI. LSPHP runs as its own process and has its own standalone binary, which can be used as a simple command line binary to execute PHP scripts from the command line.

The LSAPI is a highly optimized API that allows communication between LiteSpeed and third party web engines. Its protocol is similar to FCGI, but is more efficient.

This documentation will cover installing and configuring PHP with LSAPI for a LiteSpeed Web Server and OpenLiteSpeed Web Server.

This guide will assume that either LSWS or OLS is installed with their default paths and flags. The default installation directory for both web servers is /usr/local/lsws and both can be run from the bin subdirectory.

Please note that throughout this documentation, version numbers have been replaced with an x to ensure this documentation stays correct in the future, please replace these, as necessary, with the corresponding version numbers.

  1. To obtain and install either LiteSpeed Web Server or OpenLiteSpeed Web Server, visit the LiteSpeed Web Server documentation » install page or OpenLiteSpeed documentation » install page.

  2. Obtain and unpack the php source:

    mkdir /home/php
    cd /home/php
    tar -zxvf php-x.x.x.tar.gz
    cd php-x.x.x
  3. Configure and build PHP. This is where PHP can be customized with various options, such as which extensions will be enabled. Run ./configure --help for a list of available options. In the example, we'll use the default recommended configuration options for LiteSpeed Web Server:

    ./configure ... '--with-litespeed'
    sudo make install
  4. Checking The LSPHP Installation

    One of the simplest ways to check whether the installation of PHP was successful is to run the following code:

    cd /usr/local/lsws/fcgi-bin/
    ./lsphp5 -v

    This should return information about the new PHP build:

    PHP 5.6.17 (litespeed) (built: Mar 22 2016 11:34:19)
    Copyright (c) 1997-2014 The PHP Group
    Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies

    Notice the litespeed in parenthesis. This means that the PHP binary has been built with LSAPI support.

Following the steps above, LiteSpeed / OpenLiteSpeed Web Server should now be running with support for PHP as an SAPI extension. There are many more configuration options available for LSWS / OLS and PHP. For more information, check out the LiteSpeed documentation about » PHP.

Using LSPHP from the command line:

LSPHP(LSAPI + PHP) command line mode is used to process PHP scripts running on a remote server that does not necessarily have a web server running. It is used to process PHP scripts residing on a local web server (separate). This setup is suitable for service scalability as PHP processing is offloaded to a remote server.

Start lsphp from the command line on a remote server: LSPHP is an executable and can be started manually and bound to IPv4, IPv6, or Unix domain socket addresses with the command line option -b socket_address


Have LSPHP bind to port 3000 on all IPv4 and IPv6 addresses:

/path/to/lsphp -b [::]:3000

Have LSPHP bind to port 3000 on all IPv4 addresses:

/path/to/lsphp -b *:3000

Have LSPHP bind to address

/path/to/lsphp -b

Have LSPHP accept requests on Unix domain socket /tmp/lsphp_manual.sock:

/path/to/lsphp -b /tmp/lsphp_manual.sock

Environment variables can be added before the LSPHP executable:

PHP_LSAPI_MAX_REQUESTS=500 PHP_LSAPI_CHILDREN=35 /path/to/lsphp -b IP_address:port

Currently LiteSpeed PHP can be used with LiteSpeed Web Server, OpenLiteSpeed Web Server, and Apache mod_lsapi. For steps on server-side configuration, visit the documentation pages for » LiteSpeed Web Server and » OpenLiteSpeed.

LSPHP can be installed in several other ways as well.

CentOS: On CentOS, LSPHP can be installed from the LiteSpeed Repository or the Remi Repository using » RPM.

Debian: On Debian, LSPHP can be installed from the LiteSpeed Repository using » apt.

cPanel: Visit the respective » documentation page about how to install LSPHP with cPanel and LSWS/OLS using EasyApache 4.

Plesk: Plesk can be used with LSPHP on CentOS, CloudLinux, Debian, and Ubuntu, for more details on this, visit the respective » documentation page

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