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<h1>How to install PHP-CPP</h1>
<p>
Before you can build your own super fast native PHP extension using the
PHP-CPP library, you will first have to install the PHP-CPP library on your
system(s).
</p>
<p>
Luckily, for most of us (those who use Linux or Apple environments), this
will be a piece of cake. If you're on a different platform however, you are
left on your own, because we (as in me, the PHP-CPP developer), only uses
Linux systems. There is however no reason why this library should not also
work on other platforms, because it only uses straight forward C++ code.
Thus, if you are on a different platform and have managed to compile the
library on it, please give us feedback so that we can update these
installation instructions and include other platforms as well.
</p>
<h2 id="limitations">Limitations</h2>
<p>
At this moment, PHP-CPP only supports single-threaded PHP installations.
Web servers come in a number forms: there are the ones that handle each
page request in different process, and the ones that handle each page request
in the same process, but in a different thread. If you're using such a
multi-threaded PHP installation, you can not use the PHP-CPP library. Most
installations are single-threaded however, so this should not be a show stopper.
</p>
<p>
Are you not sure whether you have a single-threaded or multi-threaded PHP
environment? Just try to compile the PHP-CPP library, if you see a zillion
errors, you can be pretty sure that this is because of your installation
is multi-threaded.
</p>
<p>
The reason why we've chosen not to support multi-threaded PHP installations
lies in the fact that internally the Zend engine uses a very odd system
to ensure thread safety. Essentially, they pass an additional parameter to
each and every function call that holds a pointer-to-a-pointer with thread
information that you can access with specific C macro's, and that you have
to pass on to every other function call that you make. This makes life for
extension writers much harder than is necessary - and is in total conflict
with the core principle of the PHP-CPP library: to make life easy.
</p>
<p>
However, if there is demand for, we will add support for multi-threaded PHP
installations, and hopefully we can even keep the same simple C++ API as we
have now.
</p>
<h2 id="download">Download</h2>
<p>
Installation begins with downloading the source code. You can either
download the latest release from our
<a href="http://www.php-cpp.com/download">download</a> page, or get the
latest bleeding edge work-in-progress version from
<a href="https://github.com/CopernicaMarketingSoftware/PHP-CPP">GitHub</a>.
</p>
<p>
To get the latest GitHub version, run the following command from the command
line:
</p>
<p>
<pre><code>git clone https://github.com/CopernicaMarketingSoftware/PHP-CPP.git</code></pre>
</p>
<p>
After you've downloaded the software (either from our website, or directly
from GitHub), change your working directory to the PHP-CPP directory, and open
the file named "Makefile" with your editor of choice.
</p>
<p>
The Makefile is a file that holds settings and instructions for the compiler.
In 96 out of 100 situations, the default settings in this Makefile will
already be perfect for you, but you may want to have a look at it and make
(small) changes to it. You can for example change the installation directory,
and the compiler that is going to be used.
</p>
<p>
After you've checked that all settings in the Makefile are correct, you can
build the software. Do this by running the following command from within
the PHP-CPP directory.
</p>
<p>
<pre><code>make</code></pre>
</p>
<p>
This will start the compiler and build the library.
</p>
<h2 id="osx">Compiling on OSX?</h2>
<p>
If you compile the software on OSX, you may run into linking and "unresolved
symbol" errors. In that case you will have to make a change to the Makefile.
Somewhere in this Makefile there is an option "LINKER_FLAGS". This option
should be extended, and the extra flag "-undefined dynamic_lookup" should
be added to it.
</p>
<p>
After you ran 'make', and the PHP-CPP library was built, all that is left to do is
install it on your system. You can use the "make install" command for it.
This command should be executed as root, either by using "sudo", or by
logging on as root first.
</p>
<p>
<pre><code>sudo make install</code></pre>
</p>
<p>
That was it! After these steps you are now the happy owner of a system with
PHP-CPP installed and nothing can stop you from building your first fast
native PHP extension.
</p>
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