I've been looking for a way to check if a point is part of a polygon; this polygon is loaded from a file.
All the answers related to this question are solved with javascript, but I require to do this on server-side; this because the result does not need to be shown to the user as a webclient, it needs to be stored and later be used as a parameter to select a group of users (that use the system) inside that area (polygon).
I looked for a Google Maps API for PHP but it looks like it does not exists at all. I found this one, but it is not related to Google and also focuses on the front end.
I also looked for a REST API; it would have been relatively easy to load the content to my php and parse it, but looks like Google put all its efforts on the JS API.
Is there any workaround for this?
Edit 1: As #Spacedman requested, the file format is a KML
Clarification 1: I expected that Google provide a tool for this (as it exists with JS); parsing the file to check via an algorithm is a posibility and I'll have to check if it works properly.
Did you try searching for "php point in polygon" in your favourite search engine? Top hit:
http://assemblysys.com/php-point-in-polygon-algorithm/
It uses a scanline algorithm, and there's some examples. All you need to do is read your polygon file into the right format (you neglected to say what format you have) and call the function.
You can try somthing like this (in php should be similar):
int iCheck=0;
for (i = 0, v = HowManyVecotrsHasThePolygon - 1; i < HowManyVecotrsHasThePolygon; v = i++)
{
if (((vectorPointLatitud[i] > ptoLatitud) != (vectorPointLatitud[v] > ptoLatitud)) && (ptoLongitud < (vectorPointLongitud[v] - vectorPointLongitud[i]) * (ptoLatitud - vectorPointLatitud[i]) / (vectorPointLatitud[v] - vectorPointLatitud[i]) + vectorPointLongitud[i]))
iCheck++;
}
if iCheck is pair the point is outside, even inside
Checkout Polygons Eric Haines. I got the idea from him.
The idea is you've to create a Ray from your point, and check how many intersections between this ray and the Polygons vectors
The algorithm is just a bit of algebra, that you can check in any book.
You could use the PHP V8 PECL extension to execute javascript within PHP. Alternatively, you could call a node.js script using a shell command (which essentially does the same thing).
http://php.net/manual/en/book.v8js.php
http://php.net/manual/en/function.shell-exec.php
Related
I plan to use Spree for a shopping site but at some point need to sign some data with a PHP program provided by a bank. The only alternative I can think of is to link to somePage.php that runs PHP program and come back to Spree. Is there any easier way like a sending to some PHP shell inside Ruby? or changing for the view to have php extension?
Any help would be appreciated.
Well, first I would check for a native Ruby way of signing your data in Ruby. Have a look at Spree documentation first, or at your bank specs (they usually are very bad, take how bankers write contracts, they can't be any good at writing software specs).
As a second alternative, if you have the PHP program you should try and translate it in Ruby.
If that is not an option for you then you can play with open4 like this:
status = Open4::popen4("/path/to/php bank_code.php #{data_to_sign}") do |pid, stdin, stdout, stderr|
out_msg = stdout.read
err_msg = stderr.read
logger.error "out_msg #{out_msg}"
logger.error "err_msg #{err_msg}"
end
handle_error_case if status.existatus != 0
Cheers,
I'm not entirely sure the wording for the title is correct, but what I'm attempting to do is run and execute PHP files from within the Lift framework.
I'm not after any url queries to a PHP file residing on a server, more interested in somehow getting the PHP runtime working through my Scala/Lift app.
Use case: I have my app packaged into a .war file, I host this via a cloud provider. I upload code snippets to said app which then runs the php file and does whatever necessary.
I've seen various posts regarding Bianca but am hoping to keep this setup light and require only the PHP binary itself and a little code to get it flying.
Thanks in advance, please let me know if you need me to elaborate :)
“Never say never, because limits, like fears, are often just an
illusion.”
― Michael Jordan
What you really need is an open source (GPL), embeddable, full PHP 5 implementation, written entirely in Java!
Caucho's Quercus PHP Java runtime is just that, and it will let you run PHP within a Java app without external libraries or native code.
Below is a Quercus-PHP-in-Java code sample I found in this answer
import javax.script.ScriptEngine;
import com.caucho.quercus.script.QuercusScriptEngineFactory;
QuercusScriptEngineFactory factory = new QuercusScriptEngineFactory();
ScriptEngine engine = factory.getScriptEngine();
String phpCode = "<?php $foo = strlen('abc'); print $foo; return 'yikes'; ?>"; //PHP Code as String
Object o = engine.eval(phpCode);
System.out.println(o);
It should be little effort to convert this code to idiomatic Scala. Obviously, the 'phpCode' variable could be constructed from external PHP file contents etc.
Let us know how you get on ;-)
That's a bit of an odd requirement, but if it's what you need to do, you can use a ProcessBuilder to execute and interact with your PHP script from the command line.
I have a large number of EXE files and need to figure out which ones have digital signatures. Does anyone know if there is a way to check without access to WinVerifyTrust (they're all on a Unix server).
I can't seem to find any information on where the digital signature actually is inside the EXE. If I could find out where it is I might be able to open the file and fseek to a location to test. I don't need to do "real" verification on the certificate, I just want to see if a digital signature is present (or, more importantly, NOT present) without having to use WinVerifyTrust.
As mentioned above, the solely presence of the IMAGE_DIRECTORY_ENTRY_SECURITY directory is a clear indicator to detect the presence of a signature inside a PE file. If you have a large amount of files to test and want to filter these, just testing the presence of this standard directory is valid. You don't need a library to do this.
I tried to solve the problem in the same situation.
I recommend osslsigncode.
This is an implementation of windows authenticode with openssl.
https://github.com/develar/osslsigncode
Below is a code block excerpt from osslsigncode.
siglen = GET_UINT32_LE(indata + peheader + 152 + pe32plus*16 + 4);
If siglen is 0 in osslsigncode, it determines that there is no signature.
If you just want to check the signature, you don't need a library.
However, see osslsigncode for help.
You can find this information using code from Mono.Security.dll AuthenticodeBase [1]
[1] https://github.com/mono/mono/blob/master/mcs/class/Mono.Security/Mono.Security.Authenticode/AuthenticodeBase.cs
Your best hint (if an authenticode signature is present) is:
// 2.2. Locate IMAGE_DIRECTORY_ENTRY_SECURITY (offset and size)
dirSecurityOffset = BitConverterLE.ToInt32 (fileblock, peOffset + 152);
dirSecuritySize = BitConverterLE.ToInt32 (fileblock, peOffset + 156);
if dirSecuritySize is larger than 8 then there's an signature entry (valid or not).
I need to compare a webpage's DOM structure at various points in point. What are the ways to retrieve and snapshot it.
I need the DOM on server-side for processing.
I basically need to track structural changes to a webpage. Such as removing of a div tag, or inserting a p tag. Changing data (innerHTML) on those tags should not be seen as a difference.
$html_page = file_get_contents("http://awesomesite.com");
$html_dom = new DOMDocument();
$html_dom->loadHTML($html_page);
That uses PHP DOM. Very simple and actually a bit fun to use. Reference
EDIT: After clarification, a better answer lies here.
Perform the following steps on server-side:
Retrieve a snapshot of the webpage via HTTP GET
Save consecutive snapshots of a page with different names for later comparison
Compare the files with an HTML-aware diff tool (see HtmlDiff tool listing page on ESW wiki).
As a proof-of-concept example with Linux shell, you can perform this comparison as follows:
wget --output-document=snapshot1.html http://example.com/
wget --output-document=snapshot2.html http://example.com/
diff snapshot1.html snapshot2.html
You can of course wrap up these commands into a server-side program or a script.
For PHP, I would suggest you to take a look at daisydiff-php. It readily provides a PHP class that enables you to easily create an HTML-aware diff tool. Example:
<?
require_once('HTMLDiff.php');
$file1 = file_get_contents('snapshot1.html');
$file2 = file_get_contents('snapshot1.html');
HTMLDiffer->htmlDiffer( $file1, $file2 );
?>
Note that with file_get_contents, you can also retrieve data from a given URL as well.
Note that DaisyDiff itself is very fine tool for visualisation of structural changes as well.
If you use firefox, firebug lets you view the DOM structure of any web page.
I am trying to control stuff with PHP from keyboard input. The way I am currently detecting keystrokes is with:
function read() {
$fp1=fopen("/dev/stdin", "r");
$input=fgets($fp1, 255);
fclose($fp1);
return $input;
}
print("What is your first name? ");
$first_name = read();
The problem is that it is not reading the keystrokes 'live'. I don't know if this is possible using this method, and I would imagine that this isn't the most effective way to do it either. My question is 1) if this is a good way to do it, then how can I get it to work so that as you type on the page, it will capture the keystrokes, and 2) if this is a bad way of doing it, how can I implement it better (maybe using ajax or something)?
edit: I am using PHP as a webpage, not command line.
I'm assuming that you're using PHP as a web-scripting language (not from the command line)...
From what I've seen, you'll want to use Javascript on the client side to read key inputs. Once the server delivers the page to the client, there's no PHP interaction. So using AJAX to read client key inputs and make calls back to the server is the way to go.
There's some more info on Javascript and detecting key presses here and some info on how to use AJAX here.
A neat option for jQuery is to use something like delayedObserver
If you are writing a CLI application (as opposed to a web application), you can use ncurses' getch() function to get a single key stroke. Good luck!
If you're not writing a CLI application, I would suggest following Andrew's answer.
Try readline:
http://us3.php.net/manual/en/function.readline.php