Added memory management doc

Author: C-Stevens

doc/memory-management.md

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+[<-- Return to index](../README.md)
+# Memory Management
+
+### How is memory handled?
+#### PHP
+PHP is a managed memory environment, meaning it will automatically allocate and deallocate memory space as necessary without any specific thought necessarily being given by the user.
+#### Python
+Likewise, Python is also a managed memory environment. The language environment will manage memory as necessary on its own, and requires no explicit programmatic consideration for day-to-day code.
+
+### How does memory management work?
+#### PHP
+PHP uses the [Zend Memory Manager](https://secure.php.net/manual/en/internals2.memory.php) to act as a go-between for PHP's requests for memory space and the traditional C libraries for asking the operating system for resources.
+#### Python
+Python uses the [Python Memory Manager](https://docs.python.org/3/c-api/memory.html) to act as a go-between for the language and the OS-level memory allocation layer.
+
+### Is there a garbage collection service?
+#### PHP
+[Yes](https://secure.php.net/manual/en/features.gc.php)
+#### Python
+[Yes](https://docs.python.org/3/library/gc.html), and is directly accessible at the module level.
+
+### Is there automatic reference counting?
+#### PHP
+[Yes](https://secure.php.net/manual/en/features.gc.refcounting-basics.php). PHP stores the reference count internally in an `refcount` variable inside a `zval` container attached to all variables.
+#### Python
+[Yes](https://docs.python.org/2.0/ext/refcounts.html), the memory manager will automatically return an objects memory space to the OS-level if its reference count reaches zero.