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Xhprof
PHP Manual

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