Tipos de Recurso
Thread
pthreads
PHP Manual

# Constantes pré-definidas

As contantes abaixo são definidas por esta extensão e somente estarão disponíveis quando a extensão foi compilada com o PHP ou carregada dinamicamente durante a execução.

The following constants are for selective inheritance:

`PTHREADS_INHERIT_ALL` (integer)
  The default inheritance mask used when starting Threads and Workers
`PTHREADS_INHERIT_INI` (integer)
  Determines wether the ini entries are inherited by the new context
`PTHREADS_INHERIT_CONSTANTS` (integer)
  Determines wether the constants are inherited by the new context
`PTHREADS_INHERIT_CLASSES` (integer)
  Determines wether the class table is inherited by the new context
`PTHREADS_INHERIT_FUNCTIONS` (integer)
  Determines wether the function table is inherited by the new context
`PTHREADS_INHERIT_INCLUDES` (integer)
  Determines wether the included_files table is inherit by the new context
`PTHREADS_INHERIT_NONE` (integer)
  Nothing will be inherited by the new context

Tipos de Recurso
Thread
pthreads
PHP Manual