(PHP 3 >= 3.0.7, PHP 4, PHP 5)
This function will discard a BLOB created by ibase_create_blob() if it has not yet been closed by ibase_blob_close(). 如果成功则返回 TRUE,失败则返回 FALSE。
See also ibase_blob_close(), ibase_blob_create() and ibase_blob_import().