|
|
Posted by Oliver Grδtz on 10/16/49 11:32
Georgi Ivanov schrieb:
> Hi,
> AFAIK, in PHP5 one can't call function with function parameters .
> The error is that you only can pass variables by reference.
> foo(strlen('aaa'),strlen('bbbb'));
>
> Is there some sort of workaround ?
First of all, the problem with this arises if your function foo is
defined as
function foo(&$a,&$b) { ... }
There is no problem if a and b are not reference parameters.
So think a second about this: You tell in the definition of foo that you
want to write to the position where a and b are stored. But by calling
the funtion with strlen() you don't have a position in user space
because the results of strlen() are just values which haven't been
explicitly stored.
Now you can decide if you don't write to your parameters a and b. Then
there is no need for call by reference! It is not true that PHP copies
the value and that you save memory by using references! The values of
call-by-value parameters are copied if and only if you WRITE to them!
The Zend Engine 2 is highly optimized for this.
If you want to write to a and/or b then you must supply a storage
container (also called variable *g*). Simplest way of supplying a
temporary container:
foo($t1=strlen('aaa'),$t2=strlen('bbbb'));
Have Fun!
OLLi
Navigation:
[Reply to this message]
|