As
discussed
earlier
in
this
chapter
(
see
the
description
of
the
Zend
module
descriptor
block
)
,
there
are
global
,
module
,
and
request
startup
and
shutdown
events
.
The
global
startup
functions
are
called
once
when
PHP
starts
up
;
similarly
,
the
global
shutdown
functions
are
called
once
when
PHP
shuts
down
.
Please
note
that
they
'
re
really
only
called
once
,
not
when
a
new
Apache
process
is
being
created
!