(PHP 5, PHP 7 < 7.4.0)
ibase_free_result — Free a result set
ibase_free_result ( resource $result_identifier ) : bool
Frees a result set.
result_identifier
A result set created by ibase_query() or ibase_execute().
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/function.ibase-free-result.php