PHP nusoap

hi,
i have a problem with maxResult  params.

when maxResult is greater than 10,  i don't get the array with the result.

here it is:

$params = array(
        'key' => 'googlelicensekeyxxxxxxxxxxxxxxxxxxxxxx',   // Google 
license key
        'q'   => $query,                                      // search 
term
        'start' => 0,                                  // start from 
result n
        'maxResults' => 20,                            // when is 
greater than 10 got no result.
        'filter' => true,                              // remove 
similar results
        'restrict' => '',                              // restrict by topic
        'safeSearch' => true,                          // remove adult 
links
        'lr' => '',                                    // restrict by 
language
        'ie' => '',                                    // input encoding
        'oe' => ''                                     // output encoding
);
...

// invoke the method on the server
$result = $soapclient->call("doGoogleSearch", 
$params,"urn:GoogleSearch", "urn:GoogleSearch");

Thanks


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