I have ran into this limitation too....
or something like
foo();
or
foo($bar);
function foo(&$bar = null)
{
}
--- Andi Gutmans <[EMAIL PROTECTED]> wrote:
> I don't see any reason to allow passing non-variables by reference.
> It is semantically incorrect.
>
> Andi
>
> At 09:40 29/05/2002 +0200, Stig S. Bakken wrote:
> >If this patch doesn't break anything, and it doesn't give us any
> >difficulties with ZE2 or major design issues, I'm +1.
> >
> > - Stig
> >
> >On Tue, 2002-05-28 at 21:12, Jason T. Greene wrote:
> > > Due to this patch being sent during the msession discussion, it has not
> > > been noticed, so I am resending.
> > >
> > >
> > > -Jason
> > > ----
> > >
> >
> > > From: Jason Greene <[EMAIL PROTECTED]>
> > > To: [EMAIL PROTECTED]
> > > Cc: [EMAIL PROTECTED], [EMAIL PROTECTED]
> > > Subject: [PHP-DEV] [PATCH] Allow constants / expressions to be passed
> > by reference
> > > Date: 25 May 2002 02:18:52 -0500
> > >
> > > Problem
> > > -------
> > >
> > > There are some scenarios where a function requires the ability to modify
> > > parameters that may also be optional. Optional parameters work well,
> > > except in the scenario where all of the pass by reference parameters can
> > > be optional. ex the socket_select() function. Since select is
> > > argument-result, all three arrays that are taken as input must be passed
> > > by reference, yet any can be excluded. So for example if you were
> > > calling socket_select with a read socket array, a write socket array,
> > > yet no exception array (quite common), you are currently forced to do
> > > something like the following:
> > >
> > > $wfds = array($sock1, $sock2);
> > > $rfds = array($sock3, $sock4);
> > > $null = NULL;
> > >
> > > socket_select($rfds, $wfds, $null);
> > >
> > >
> > > I have ran into this problem before several times while developing in
> > > user space. (Especially when passing around semi-complex data
> > > structures)
> > >
> > > Proposed Solution
> > > ------------------
> > >
> > > Allow all expressions to be passed by reference. This will allow
> > > something like the following
> > >
> > > function normalize(&$element_tree, &$node_mapping, $max_depth){
> > > //Code
> > > }
> > >
> > > normalize($my_tree, NULL, 25000);
> > >
> > >
> > > Patch
> > > ------
> > >
> > > I have attached a patch against ZE2 that accomplishes this.
> > >
> > >
> > > Thanks,
> > > -Jason
> > >
> > >
> > >
> > >
> > >
> > > ----
> > >
> >
> > > Index: zend_compile.c
> > > ===================================================================
> > > RCS file: /repository/ZendEngine2/zend_compile.c,v
> > > retrieving revision 1.285
> > > diff -u -r1.285 zend_compile.c
> > > --- zend_compile.c 23 Apr 2002 18:06:53 -0000 1.285
> > > +++ zend_compile.c 25 May 2002 06:45:21 -0000
> > > @@ -1271,7 +1271,7 @@
> > > op = ZEND_SEND_REF;
> > > break;
> > > default:
> > > - zend_error(E_COMPILE_ERROR, "Only
> > variables can be passed by reference");
> > > + op = ZEND_SEND_VAR;
> > > break;
> > > }
> > > }
> > > Index: zend_execute.c
> > > ===================================================================
> > > RCS file: /repository/ZendEngine2/zend_execute.c,v
> > > retrieving revision 1.341
> > > diff -u -r1.341 zend_execute.c
> > > --- zend_execute.c 8 May 2002 18:43:19 -0000 1.341
> > > +++ zend_execute.c 25 May 2002 06:45:25 -0000
> > > @@ -2292,10 +2292,6 @@
> > > NEXT_OPCODE();
> > > }
> > > case ZEND_SEND_VAL:
> > > - if
> > (EX(opline)->extended_value==ZEND_DO_FCALL_BY_NAME
> > > - &&
> > ARG_SHOULD_BE_SENT_BY_REF(EX(opline)->op2.u.opline_num, EX(fbc),
> > EX(fbc)->common.arg_types)) {
> > > - zend_error(E_ERROR,
> > "Cannot pass parameter %d by reference", EX(opline)->op2.u.opline_num);
> > > - }
> > > {
> > > zval *valptr;
> > > zval *value;
> > > @@ -2329,7 +2325,8 @@
> > >
> > zend_ptr_stack_push(&EG(argument_stack), varptr);
> > > NEXT_OPCODE();
> > > }
> > > - zend_error(E_ERROR, "Only
> > variables can be passed by reference");
> > > + /* Should only occur with an
> > uninitialized variable */
> > > + goto send_by_var;
> > > }
> > > NEXT_OPCODE();
> > > case ZEND_SEND_VAR:
> > >
> > > ----
> > >
> >
> > > --
> > > PHP Development Mailing List <http://www.php.net/>
> > > To unsubscribe, visit: http://www.php.net/unsub.php
> > > ----
> > >
> >
> > > --
> > > PHP Development Mailing List <http://www.php.net/>
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>
>
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