encryption in php

Question

$key = file_get_contents('http://keyserver.pramberger.at/pks/lookup?op=get&search=userid');

this code gives me public key with the html tag .how to extract the public key block form begin pgp public key block ---to---- end pgp public key block and using this public key i need to encrypt the data .i need to do it in php.

Answer 1

try this
preg_match('/PUBLIC KEY BLOCK-----\s(.*?)\s-----END PGP/s', $data, $match);
echo $match[1]; //returns the key

Answer 2

or that

$pgp_key = trim(preg_replace('/(.*)<pre>(.*)<\/pre>(.*)/s','\2',$key));