What
References
Do
it means that
$a
and
$b
point to the same variable.
Notatka:
$a
and
$b
are completely equal here, that's not
$a
is pointing to
$b
or vice versa, that's
$a
and
$b
pointing to the same place.
will make
$a
to be 6. This happens because in the function
foo
the variable
$var
refers to the same content as
$a
. See also more detailed explanations about
passing by reference
.