I am using one com object with php. It is working fine for some no. of files (random), and then it stops working. After I restart apache server it again works fine.
I tried using: ob_start() before using com object and at the end of code: ob_end_flush(),ob_flush() and flush() functions.
But still not able to solve my problem.

so go back to the author and or vendor of the com object and find out what they suggest

I test my code. It works fine up to initialization of com object, after that it hangs without giving any error. Just by restarting of apache, apache releases that memory and my code works fine.
I want to release that same memory from my PHP code.