KDB IPC implementation for PHP

KDB Client

A usable, but mostly incomplete K client in PHP:

$k=new K();
print_r($k->k("{a::x;(\"foo\";x)}", 69));

Can also create symbols with K::S() e.g.

print_r($k->k("{insert[x](`h`d`v!y)}", K::S("table"), array(array(42), array(69), array(38))));

KDB Server

class Receiver {
  public function ks($a, $x=null, $y=null, $z=null) {} // called for async
  public function k($a , $x=null, $y=null, $z=null) {return K::S("table");} // called for sync
};
K::server_loop(1234, new Receiver());

Reference Guide

Symbol Construction

K::S("text") creates a symbol from a string. This is what you get when you type:

`text

into KDB.

Guid Construction

K::G() creates a guid.

Instance Methods

$k->k(...)
$k->ks(...)

These send a statement (first argument). Optional arguments will be assigned to x, y, z, etc.

k will send a message, then wait for (and decode) the results. ks will send a message and tell KDB not to bother sending any results.

$k->ka(...)
$k->kr()

ka and kr work like the the send and receive legs of k. This allows you to pipeline messages:

for($i=0;$i<100;++$i) $k->ka("1+", $i);
for($i=0;$i<100;++$i) $r[] = $k->kr();

Read from String

$r = $k->krs("<ipc message>");

If you have an IPC message in a string (for example, you read it from a file) then you can parse it directly.

Opinionated TLS mode

If you're using kdb+ in TLS mode, you can connect if you supply the CA certificate so that qphp can verify it:

$k = new KTLS("ca.pem","localhost",1234);
print_r($k->k("2+2"));

You can also implement a TLS server:

KTLS::server_loop(array("ssl" => array("local_cert" => "server-crt.pem", "local_pk" => "server-key.pem")),
  1234, new Receiver());

geocar / qphp