Description:
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PHP 7 snapshots after 2014-10-16 (i.e. the last working snapshot I have is from 2014-10-16) always returns in "Out of memory" even for very things like php --version. It does not matter whether it is a TS, NTS, x86 or x64. The result is always the same.

Today I tried to look into it to determine the cause. Note that I've never debugged a PHP binary before and I may have done something entirely wrong. Here is what I have found out:

"Out of memory" is a message from https://github.com/php/php-src/blob/e9068cefb4d97483823f8ee4dc384da7adf0c124/Zend/zend_alloc.h#L173, meaning that malloc call failed because PHP has exhausted all available memory (8 GB installed).

This is a callstack from one of the exhausting allocation call:
php7.dll!_safe_malloc(unsigned __int64 nmemb=8791237589792, unsigned __int64 size=8791237761384, unsigned __int64 offset=2008765488)
php7.dll!_zend_hash_str_add(_HashTable * ht=0x0000000000000000, const char * str=0x0000000000000000, unsigned __int64 len=8791237589792, _zval_struct * pData=0x0000000000000000)
php7.dll!sapi_register_post_entries(_sapi_post_entry * post_entries=0x0000000000000000)
php7.dll!php_setup_sapi_content_types()
php7.dll!sapi_startup(_sapi_module_struct * sf=0x0000000000000002)
php.exe!main(int argc=0, char * * argv=0x01d030500c41b2c3)
php.exe!__tmainCRTStartup()

Screenshot showing that php.exe --version has allocated over 2 GB:
http://screencast.com/t/AdxbuA8o6i