# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`XHPROF_FLAGS_NO_BUILTINS` (int)
  Used to skip all built-in (internal) functions.
`XHPROF_FLAGS_CPU` (int)
  Used to add CPU profiling information to the output.
`XHPROF_FLAGS_MEMORY` (int)
  Used to add memory profiling information to the output.