[php-src] Issue #18873: `OCI_RETURN_LOBS` flag causes oci8 to leak memory

Issue: https://github.com/php/php-src/issues/18873 Author: mvorisek ### Description The following code: https://raw.githubusercontent.com/php/pecl-database-oci8/9a1241341cd02aa68c587046f11b0343bc713b8f/tests/gh-4-return-lob.phpt (2 lines changed of https://raw.githubusercontent.com/php/pecl-database-oci8/9a1241341cd02aa68c587046f11b0343bc713b8f/tests/gh-4.phpt already present test) Resulted in this output: ``` array(9) { [1]=> int(6872016) [2]=> int(6872368) [3]=> int(6872400) [4]=> int(6872432) [5]=> int(6872464) ... } PHP Fatal error: Uncaught Exception: memory leak detected in ... ``` But I expected this output instead: ``` ok ``` Notes: https://github.com/php/pecl-database-oci8/pull/29 fixed memory leak once after 8th descriptor create, and such fix can be backported into PHP 8.2 however it is not critical and maybe it can be even considered a feature. This issue is about a clear memory leak after every iteration when the data are fetched using OCI_RETURN_LOBS flag. Such flag imply the data are not returned as descriptor, but as a string instead. So it seems the descriptor is somehow not released after the data are read. ### PHP Version ```plain PHP 8.2 - master ``` ### Operating System any (tested linux and Windows)