xdebug.auto_trace=1 ; enable tracing
xdebug.trace_output_dir=/tmp ; trace output directory
xdebug.trace_output_name=crc32 ; tracefile extension
xdebug.collect_params=0 ; parameter collection
xdebug.collect_includes=1 ; collecting includes
xdebug.extended_info=0 ; extended code generation
xdebug.show_mem_delta=1 ; memory difference