(PECL ibm_db2 >= 1.0.0)
db2_free_result — Frees resources associated with a result set
$stmt): boolFrees the system and database resources that are associated with a result set. These resources are freed implicitly when a script finishes, but you can call db2_free_result() to explicitly free the result set resources before the end of the script.
stmtA valid statement resource.
成功时返回 true， 或者在失败时返回 false。