# 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.

`PTHREADS_INHERIT_ALL` (int)
  The default options for all Threads, causes pthreads to copy the environment when new Threads are started
`PTHREADS_INHERIT_NONE` (int)
  Do not inherit anything when new Threads are started
`PTHREADS_INHERIT_INI` (int)
  Inherit INI entries when new Threads are started
`PTHREADS_INHERIT_CONSTANTS` (int)
  Inherit user declared constants when new Threads are started
`PTHREADS_INHERIT_CLASSES` (int)
  Inherit user declared classes when new Threads are started
`PTHREADS_INHERIT_FUNCTIONS` (int)
  Inherit user declared functions when new Threads are started
`PTHREADS_INHERIT_INCLUDES` (int)
  Inherit included file information when new Threads are started
`PTHREADS_INHERIT_COMMENTS` (int)
  Inherit all comments when new Threads are started
`PTHREADS_ALLOW_HEADERS` (int)
  Allow new Threads to send headers to standard output (normally prohibited)