Description:
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The oauth_http_build_query does not verify the data that the user submits via the extra_parameters array in the fetch method.

param_value = oauth_url_encode(Z_STRVAL_PP((zval**)cur_val)); 

This assumes that the user submits a string value in the extra_parameters array, if however the user submits an integer value as the array value, PHP crashes with out of bounds memory error. 

-Works
$arrayResp = $o->fetch("https://fireeagle.yahooapis.com/api/0.1/update",array("postal" => "95054"));

-Crashes
$arrayResp = $o->fetch("https://fireeagle.yahooapis.com/api/0.1/update",array("postal" => 95054));

Reproduce code:
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This will crash.

$arrayResp = $o->fetch("https://fireeagle.yahooapis.com/api/0.1/update",array("postal" => 95054));

This does not as it is a string.

$arrayResp = $o->fetch("https://fireeagle.yahooapis.com/api/0.1/update",array("postal" => "95054"));