Hi internals, following recently added alternative to `token_get_all()` in form of a dedicated class `PhpToken` I've made a similar proposal for collecting stack traces by introducing `StackFrame::getTrace()` and `StackFrame` which replaces array with keys and values known from `debug_backtrace()`.
To compete with easier adoption `StackFrame` implements `ArrayAccess` giving identical API to `debug_backtrace()`. A test script with deep recursion up to 1M frames uses 50% less memory than `debug_backtrace()`. The RFC is described here https://wiki.php.net/rfc/stack-frame-class It includes implementation of PoC and tests. Cheers, Michał Marcin Brzuchalski
