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Ice for PHP Build Instructions

This page describes how to build and install Ice for PHP from source.

ZeroC provides binary distributions for many platforms, including Linux, so building Ice for PHP from source is usually unnecessary.

PHP Build Requirements

Ice was extensively tested using the operating systems and compiler versions listed on supported platforms.

On Windows, the build requires a recent version of Visual Studio and the Ice Builder for Visual Studio.

Building the PHP Extension

Linux or macOS

The build of Ice for PHP requires that you first build Ice for C++ in the cpp subdirectory.

From the top-level source directory, edit config/Make.rules to establish your build configuration. The comments in the file provide more information.

Our source code only supports building Ice for PHP as a dynamic PHP extension; the product of the build is a shared library that you must configure PHP to load.

Change to the php source subdirectory:

cd php

Ensure that php and php-config for the version of PHP you wish to build against are first in your PATH.

Run make to build the extension.

Installing the PHP Extension

Linux or macOS

To install the Ice extension, you must move the extension's shared library into PHP's extension directory. This directory is determined by the PHP configuration directive extension_dir. You can determine the default value for this directive by running the command-line version of PHP with the -i option:

php -i

Review the output for a line like this:

extension_dir => /usr/lib/php/modules => /usr/lib/php/modules

Once you've copied the extension to PHP's extension directory, you will need to enable the extension in your PHP configuration. Your PHP installation likely supports the /etc/php.d configuration directory, which you can verify by examining the output of php -i and looking for the presence of --with-config-file-scan-dir in the "Configure Command" entry. If present, you can create a file in /etc/php.d that contains the directive to load the Ice extension. For example, create the file /etc/php.d/ice.ini containing the following line:

extension = ice.so

If PHP does not support the /etc/php.d directory, determine the path name of PHP's configuration file as reported by the php -i command:

Configuration File (php.ini) Path => /etc/php.ini

Open the configuration file and append the following line:

extension = ice.so

You can verify that PHP is loading the Ice extension by running the command shown below:

php -m

Look for ice among the installed modules. Note that your library search path (LD_LIBRARY_PATH on Linux or DYLD_LIBRARY_PATH on macOS) must include the directory containing the Ice shared libraries.

Read the PHP Dependencies and PHP Source Files sections below for more information about installing the Ice extension.

PHP Dependencies

PHP needs to locate the libraries for the Ice run-time libraries and its third-party dependencies.

  • Linux and macOS
libIce
libIceDiscovery
libIceLocatorDiscovery
libIceSSL
libbz2

In general, these libraries must reside in a directory of the user's PATH. For Web servers, the libraries may need to reside in a system directory. For example, on Linux you can add the directory containing the Ice run-time libraries to /etc/ld.so.conf and run ldconfig.

You can verify that the Ice extension is installed properly by examining the output of the php -m command, or by calling the phpInfo() function from a script. For example, you can create a file in the Web server's document directory containing the following PHP script:

<?php
phpInfo();
?>

Then start a browser window and open the URL corresponding to this script. If the Ice extension is successfully installed, you will see an ice section among the configuration information.

PHP Source Files

In addition to the binary Ice extension module and its library dependencies, you will also need to make the Ice for PHP source files available to your scripts. These files are located in the lib subdirectory and consist of the Ice run time definitions (Ice.php) along with PHP source files generated from the Slice files included in the Ice distribution.

The Ice extension makes no assumptions about the location of these files, so you can install them anywhere you like. For example, you can simply include them in the same directory as your application scripts. Alternatively, if you prefer to install them in a common directory, you may need to modify PHP's include_path directive so that the PHP interpreter is able to locate these files. For example, you could append to php.ini:

include_path=${include_path}";C\ice\php\lib"

Another option is to modify the include path from within your script prior to including any Ice run-time file. Here is an example that assumes Ice is installed in /opt:

ini_set('include_path',
ini_get('include_path') . PATH_SEPARATOR . '/opt/Ice/php');
require 'Ice.php'; // Load the core Ice run time definitions.

Running the PHP Tests

The test subdirectory contains PHP implementations of the core Ice test suite. Python is required to run the test suite.

The test suites also require that the Ice for C++ tests be built in the cpp subdirectory of this source distribution. In addition, the scripts require that the CLI version of the PHP interpreter be available in your PATH.

After a successful build, you can run the tests as follows:

python allTests.py

If everything worked out, you should see lots of ok messages. In case of a failure, the tests abort with failed.

Web Server Permissions

The Web server normally runs in a special user account that may not necessarily have access to the Ice extension, its dependent libraries and PHP source files, and other resources such as Ice configuration and your application scripts. It is very important that you review the permissions of these files and verify that the Web server has sufficient access.

On Linux, Apache typically runs in the apache account, so you will either need to change the owner or group of the libraries and other resources, or modify their permissions to make them sufficiently accessible.

SELinux Notes for PHP

SELinux augments the traditional Unix permissions with a number of new features. In particular, SELinux can prevent the httpd daemon from opening network connections and reading files without the proper SELinux types.

If you suspect that your Ice for PHP application does not work due to SELinux restrictions, we recommend that you first try it with SELinux disabled. As root, run:

setenforce 0

to disable SELinux until the next reboot of your computer.

If you want to run httpd with Ice for PHP and SELinux enabled, there are two steps you need to take. First, allow httpd to open network connections:

setsebool httpd_can_network_connect=1

Add the -P option to make this setting persistent across reboots.

Second, make sure any .ice file used by your PHP scripts can be read by httpd. The enclosing directory also needs to be accessible. For example:

chcon -R -t httpd_sys_content_t /opt/MyApp/slice