Gets current raw backtrace leading to this function call.
This is quicker than debug_get_backtrace, because it doesn't demangle the backtrace. To demangle it (replace addresses with actual function calls and eventually line numbers, if available) call debug_demangle_backtrace.
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Current raw backtrace, or null, if cannot determine it. Note: Getting backtraces only works if the library was configured with --enable-backtraces. See also debug_get_backtrace |