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(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0)
yaz_addinfo — Returns additional error information
Returns additional error information for the last request on the server.
With some servers, this function may return the same string as yaz_error().
The connection resource returned by yaz_connect().
A string containing additional error information or an empty string if the last operation was successful or if no additional information was provided by the server.