Hi All,
In Zend/zend_API.c 
function module_destructor
There is a code to do a dlclose on the dlopened handle.
The code looks like following,
        if (module->handle) {
                dlclose(module->handle);
        }

Unfortunately this module->handle is always 0 which causes this symbols
not getting unloaded.(Even for dynamically loaded PHP extnsion also
handle is 0)
Till version 1.91 of ext/standard/dl.c this handle member was getting
populated.
>From 1.92 onwards this stopped happening..

With regards
Kamesh Jayachandran

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