Code:

    <?php
    putenv('GNUPGHOME=/var/www/.gnupg/');
    error_reporting(E_ALL);
    $res = gnupg_init();
    gnupg_seterrormode($res,GNUPG_ERROR_WARNING);
    $info = gnupg_keyinfo($res, '1D2757F6764AA8A68EE96008651FBE12F7A623EC');
    echo "KEY INFO print_r gnupg_gete =\n";
    print_r(gnupg_geterror($res));
    echo "KEY INFO vardump enc = \n";
    var_dump($enc);
    echo "Key - Info<pre>";
    var_dump($info);
    echo "</pre>";


    // Enter your .gnupg environment
    gnupg_addencryptkey($res,"1D2757F6764AA8A68EE96008651FBE12F7A623EC");
    gnupg_addsignkey($res,"1D2757F6764AA8A68EE96008651FBE12F7A623EC","");
    $enc = gnupg_encryptsign($res, "just a test");
    echo "TXT print_r(gnupg_geterror(res));TXT\n";
    print_r(gnupg_geterror($res));
    echo "TXT var_dump($enc); TXT\n";
    var_dump($enc);
    ?>

output:


KEY INFO print_r gnupg_gete =
KEY INFO vardump enc =
NULL
Key - Info<pre>array(1) {
  [0]=>
  array(8) {
    ["disabled"]=>
    bool(false)
    ["expired"]=>
    bool(false)
    ["revoked"]=>
    bool(false)
    ["is_secret"]=>
    bool(false)
    ["can_sign"]=>
    bool(true)
    ["can_encrypt"]=>
    bool(true)
    ["uids"]=>
    array(1) {
      [0]=>
      array(6) {
        ["name"]=>
        string(8) "Passbolt"
        ["comment"]=>
        string(0) ""
        ["email"]=>
        string(16) "security@domain.com"
        ["uid"]=>
        string(27) "Passbolt <security@domain.com>"
        ["revoked"]=>
        bool(false)
        ["invalid"]=>
        bool(false)
      }
    }
    ["subkeys"]=>
    array(2) {
      [0]=>
      array(11) {
        ["fingerprint"]=>
        string(40) "1D2757F6764AA8A68EE96008651FBE12F7A623EC"
        ["keyid"]=>
        string(16) "651FBE12F7A623EC"
        ["timestamp"]=>
        int(1512390494)
        ["expires"]=>
        int(0)
        ["is_secret"]=>
        bool(false)
        ["invalid"]=>
        bool(false)
        ["can_encrypt"]=>
        bool(false)
        ["can_sign"]=>
        bool(true)
        ["disabled"]=>
        bool(false)
        ["expired"]=>
        bool(false)
        ["revoked"]=>
        bool(false)
      }
      [1]=>
      array(11) {
        ["fingerprint"]=>
        string(40) "7DB712B657B432086CDA30466D0AD4AA4C799C97"
        ["keyid"]=>
        string(16) "6D0AD4AA4C799C97"
        ["timestamp"]=>
        int(1512390494)
        ["expires"]=>
        int(0)
        ["is_secret"]=>
        bool(false)
        ["invalid"]=>
        bool(false)
        ["can_encrypt"]=>
        bool(true)
        ["can_sign"]=>
        bool(false)
        ["disabled"]=>
        bool(false)
        ["expired"]=>
        bool(false)
        ["revoked"]=>
        bool(false)
      }
    }
  }
}
</pre>TXT print_r(gnupg_geterror(res));TXT
TXT var_dump(); TXT
bool(false)