I am looking to see if this is a possible scenario -
My php page calls prolog (and sends the query with data), and then prolog code runs and binds certain (output) variables, and then I take these variables and then load it into mysql db.
ie,
PHP -> call and send data -> Prolog -> execute goal and bind output variables -> send output variables into mysql db
I have seen a lot of documentation on how to "generate" html pages using sicstus and swi etc.. but this is reverse of what i want to achieve. any pointers?
thanks!
Based on my experience on previous projects where I had to connect PHP with Prolog I called Prolog from PHP using the php exec function:
exec("\"c:/program files/swipl/bin/swipl.exe\"" -f prolog_filename.pl -g your_query)
The exec function returns Prolog's output which you can you as you like(eg sending it to your mysql db).
You may need to edit the prolog path accordingly.
It's definitively possible to do what you're thinking about. For example
http://www.swi-prolog.org/pldoc/package/odbc.html
would allow you to work with a MySQL database from Prolog. However, I'm fairly certain that sending the output of your Prolog program back to php and then inserting it into mysql from the php side of things will make your life a whole lot easier.
Calling SWI-Prolog from a Web server could be done as illustrated by J.Paine here, but the preferred way of run SWI-Prolog on server side is, well... as a Web Server.
This because is simpler to debug the logic and getting formatted output using the extensive libraries that SWI-Prolog offers.
There is always the possibility to write a PHP extension module, the underling language is the same C, but this is clearly a difficult path.
Related
I’ve written a small database engine in C that works by reading commands you input in the console and it outputs the result.
Is there any way of me writting some PHP code that could send arguments to the console and recieve the output back to PHP without restarting the compiled program.
Is there a better way of doing this?
You say you want the PHP to send and receive messages to your program without restarting the compiled program.
So I don't think using shell_exec or proc_open will work how you want, since these commands both load a fresh instance of the compiled program.
Instead, I suggest you look into sockets, and how you would rewrite your database engine to use those instead of STDIN/STDOUT. Then you can use PHP's socket functions to communicate between your applications. And you'll have just one instance of your compiled program running in the background, even with multiple hits to your PHP script.
i am trying to find a way to have a PHP script execute a .cpp file, and then return the results via PHP.
I will map out my methodology to avoid confusion in my question:
Certain action on webpage (Button click) -> PHP runs .cpp file -> the results of the .cpp file are returned to PHP -> returned data is used to repopulate the page .
Is this possible to do? (please do not vote down, i have looked online and could not find a solid lead to help me establish this connection)
I hope you mean to run a built executable...
The exec function will run the application similar to running it through a command line. This means that you can get the standard output of the application like you would through the command line.
How to run abc.exe using php
It's kind of kludgy, if you can, just duplicate the executables functionality in PHP.
How can I access my php script from a Python script?
I need my Python script to be able to access the variables within the php script. (By the way, I'm new to php and Python.)
Thanks in advance.
If I understand it correctly, you have a service in PHP, and want to communicate with another one in Python.
Now, this is not really related to PHP or Python: this is quite a classic issue of integration and there are several ways to accomplish it; without more details about your problem, it may be very difficult to be specific about a solution and what kind of approach could be the better for you, but below you can find some ideas.
You could for instance save the status from PHP service in an ad-hoc table in the database, and then query it from the Python service.
Another way could be to use a RESTful approach: the information is available as a resource, accessible via a GET query; in PHP you would have a small handler that would just return a small JSON (or XML, if you like that kind of stuff), and in Python you would have instead the client. Of course, there are security issues to consider, but I think you got the idea.
For more information, I recommend you having a look at an interesting series written some time ago by Paul Stovell about integration. It is very accessible, and shows several approaches - although not all of them apply to your current issue.
Elaborate. Is the PHP file local? On a webserver? Where's the python file?
If the php file is on a server with the python file, use an exec statement.
If the python file is local and the php file is on a server, then you need to use urllib.
If both are local, write an interpreter...
I am writing a small web server, nothing fancy, I basically just want to be able to show some files. I would like to use PHP though, and im wondering if just putting the php code inside of the html will be fine, or if I need to actually use some type of PHP library?
http://www.adp-gmbh.ch/win/misc/webserver.html
I just downloaded that and I am going to use that to work off of. Basically I am writing a serverside game plugin that will allow game server owners to access a web control panel for their server. Some features would be possible with PHP so this is my goal. Any help would be appreciated, thanks!
The PHP won't serve itself. What happens in a web server like Apache is before the PHP is served to the user it is passed through a PHP parser. That PHP parser reads, understands and executes anything between (or even ) tags depending on configuration. The resultant output, usually still HTML, is served by the web server.
There are a number of ways to achieve this. Modules to process PHP have been written by Apache but you do not have to use these. PHP.exe on windows, installed from windows.php.net, will do this for you. Given a PHP file as an argument it will parse the PHP and spit the result back out on the standard output.
So, one option for you is to start PHP.exe from within your web server with a re-directed standard output to your program, and serve the result.
How to create a child process with re-directed IO: http://msdn.microsoft.com/en-us/library/ms682499%28VS.85%29.aspx however, you won't be writing the child process, that'll be PHP.exe
Caveat: I am not sure from a security / in production use perspective if this is the most secure approach, but it would work.
PHP needs to be processed by the PHP runtime. I'm assuming the case you're talking about is that you have a C++ server answering HTTP queries, and you want to write PHP code out with the HTML when you respond to clients.
I'm not aware of any general-purpose PHP library. The most straightforward solution is probably to use PHP as a CGI program.
Here's a link that might be useful for that: http://osdir.com/ml/php-general/2009-06/msg00473.html
This method is nice because you don't need to write the HTML+PHP out to a file first; you can stream it to PHP.
You need execute the PHP page to serve the page it generates.
The easiest thing for you to do would be to add CGI support to your webserver in some basic form. This is non-trivial, but not too difficult. Basically you need to pass PHP an environment and input, and retrieve the output.
Once you have CGI support you can just use any executable, including PHP, to generate webpages.
My question is whether or not Flex's fcsh can be called from within a PHP script. Here is the background:
I have been created a simple process that creates a simple quiz/tutorial by converting a text file into a .mxml file and compiling to a .swf file using the mxmlc compiler. This works well from the command line, but I wanted to make the process easier by creating a web-interface to do this. My initial attempts with PHP's exec() function have not worked. The Python scripts I use to create the .mxml file work fine (using exec()), but I have not been able to get the mxmlc compiler to work.
After searching on the Web and on this site, I believe that using fcsh (instead of mxmlc) may be the way to go. Using fcsh would certainly compile the .mxml file faster (after the first run), and I think that fcsh can be launched as a service that might be able to be called from PHP.
On the other hand, maybe I am approaching this the wrong way. Would it be better to write a Flex application that calls fcsh and avoid using PHP?
Edit: Using fcshctl as hasseg suggested in his answer below worked very well. Thanks Ali.
The problem with calling fcsh from within scripts is that it works as an interactive shell instead of taking command-line arguments, compiling, and returning an exit status. There are different ways to get around this, which I've listed in this blog post of mine, where I mainly talk about fcshctl (which is my own solution for this,) but at the bottom of the post I've also listed other similar solutions to get fcsh integrated into nonstandard build workflows.
There are a few other ways in php to execute an external script. They are exec(), passthru(), system(), and backticks i.e. the key to the left of the 1 key. Each one has a different purpose and return mechanism.
You may have to put the command that executes your executable into a script and call that script via one of these functions.
Is there a particular reason why you can't use mxmlc directly? It seems like it would be easier to call than fcsh. Just specify all your compiler options in a XML file run it like mxmlc -load-config path/to/config.xml. You can find an example of the XML configuration format in FLEX_HOME/frameworks/flex-config.xml.