[wp-hackers] passing references to do_action/apply_filters

[Robert Deaton]

A quick note, allow_call_time_pass_reference is "1" by default. While
it doesn't stop the warning, at least we know the code still works on
default installs for now.

On 8/4/05, Nikolay Bachiyski <nbachiyski at developer.bg> wrote:
> In newer default php.ini setups the value of
> 
> allow_call_time_pass_reference (see http://uk2.php.net/ini.core)
> 
> is Off, which does not allow to pass arguments by reference unless it is
> explicitly noted in the function's declaration.
> 
> However, sometimes is is needed a hook to change the values of its
> arguments. For example see the patch for pre_ping hook
> (http://trac.wordpress.org/ticket/1489 and
> http://trac.wordpress.org/changeset/2743 ) and if
> allow_call_time_pass_reference is Off it causes a Warning: "Warning:
> Call-time pass-by-reference has been deprecated.." (see
> http://trac.wordpress.org/ticket/1547).
> 
> Unfortunately there isn't an easy way to control whether
> do_action/apply_filter arguments are passed by reference of by value.
> 
> Of course there are some dirty hacks, as for example using an array to
> pass all the variables:
> 
> <?php
> function varargs_by_ref($arg_list = null) {
>         if (is_array($arg_list)) {
>                 foreach ($arg_list as &$arg) {
>                         # do whatever you want with $arg...
>                 }
>         }
> }
> 
> $by_ref = 'to_be_midified_inside_func';
> $by_val = 'to_be_passed_by_value';
> 
> varargs_by_ref(array('baba', &$by_ref, $by_value));
> 
> ?>
> 
> Any other suggestions?
> 
> Nikolay.
> 
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> 


-- 
--Robert Deaton
http://somethingunpredictable.com