I have a method
>>>
function appendChildNode ( AST $aNewChild ) {
...
}
<<<
where AST is a class. If I pass null, PHP renders this message:
>>>
Catchable fatal error: Argument 1 passed to AST::appendChil dNode()
must be an instance of AST, null given, called in /Applications/MAMP/
htdocs/compile/includes/CParser.inc.php (517) : eval()'d code on line 1
and defined in /Applications/MAMP/htdocs/compile/includes/AST.inc.php
on line 43
<<<
Any ideas, why I can't pass a null value?
[appendChildNode () is a method declared inside the class AST] 13  4748 
in php, null is not only a value but also a type, and the type hint was
violated
On 13 Jan., 03:56, "Peter Pei" <yan...@telus.c omwrote:
in php, null is not only a value but also a type, and the type hint was
violated
OK, thx. How do I have to pass a null 'pointer' as an object?
On Sun, 13 Jan 2008 03:50:33 +0100, seaside <se********@mac .comwrote:
I have a method
>>>>
function appendChildNode ( AST $aNewChild ) {
...
}
<<<
where AST is a class. If I pass null, PHP renders this message:
>>>>
Catchable fatal error: Argument 1 passed to AST::appendChil dNode()
must be an instance of AST, null given, called in /Applications/MAMP/
htdocs/compile/includes/CParser.inc.php (517) : eval()'d code on line 1
and defined in /Applications/MAMP/htdocs/compile/includes/AST.inc.php
on line 43
<<<
Any ideas, why I can't pass a null value?
For some reason:
function appendChildNode ( AST $aNewChild = NULL ) {
....
}
.... now it will work.
--
Rik Wasmus
buggy. inconsistent lang design
On 13 Jan., 04:00, "Rik Wasmus" <luiheidsgoe... @hotmail.comwro te:
On Sun, 13 Jan 2008 03:50:33 +0100, seaside <seaside...@mac .comwrote:
I have a method
* function appendChildNode ( AST $aNewChild ) {
* ...
* }
<<<
where AST is a class. If I pass null, PHP renders this message:
Catchable fatal error: Argument 1 passed to AST::appendChil dNode()
must be an instance of AST, null given, called in /Applications/MAMP/
htdocs/compile/includes/CParser.inc.php (517) : eval()'d code on line 1
and defined in /Applications/MAMP/htdocs/compile/includes/AST.inc.php
on line 43
<<<
Any ideas, why I can't pass a null value?
For some reason:
function appendChildNode ( AST $aNewChild = NULL ) {
}
But now, I can call it 'legally' with no parameters, which I don't
want.
At least any reader would think, 'OK, passing no value is OK'.
Do we have other options?
Additionally: I'll go into details of the code soon, but does the
default value make to
exception disappear, since I passed no value at all to appendChildNode ?
seaside wrote:
On 13 Jan., 04:00, "Rik Wasmus" <luiheidsgoe... @hotmail.comwro te:
>On Sun, 13 Jan 2008 03:50:33 +0100, seaside <seaside...@mac .comwrote:
>>I have a method
function appendChildNode ( AST $aNewChild ) {
...
}
<<<
where AST is a class. If I pass null, PHP renders this message:
Catchable fatal error: Argument 1 passed to AST::appendChil dNode()
must be an instance of AST, null given, called in /Applications/MAMP/
htdocs/compile/includes/CParser.inc.php (517) : eval()'d code on line 1
and defined in /Applications/MAMP/htdocs/compile/includes/AST.inc.php
on line 43
<<<
Any ideas, why I can't pass a null value?
For some reason:
function appendChildNode ( AST $aNewChild = NULL ) {
}
But now, I can call it 'legally' with no parameters, which I don't
want.
At least any reader would think, 'OK, passing no value is OK'.
Do we have other options?
Additionally: I'll go into details of the code soon, but does the
default value make to
exception disappear, since I passed no value at all to appendChildNode ?
As Rik pointed out, type hinting is a somewhat inconsistent operation in
PHP. But this a new area for PHP, and I'm not sure it's been entirely
thought out yet (as seems to be with a lot of things in PHP).
Of course, you could not use type hinting. Instead, you can use
instanceof() in the function itself to ensure you have an instance of
the object. This way you can check for null, also.
--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp. js*******@attgl obal.net
=============== ===
On 13 Jan., 04:32, Jerry Stuckle <jstuck...@attg lobal.netwrote:
seaside wrote:
On 13 Jan., 04:00, "Rik Wasmus" <luiheidsgoe... @hotmail.comwro te:
On Sun, 13 Jan 2008 03:50:33 +0100, seaside <seaside...@mac .comwrote:
I have a method
* function appendChildNode ( AST $aNewChild ) {
* ...
* }
<<<
where AST is a class. If I pass null, PHP renders this message:
Catchable fatal error: Argument 1 passed to AST::appendChil dNode()
must be an instance of AST, null given, called in /Applications/MAMP/
htdocs/compile/includes/CParser.inc.php (517) : eval()'d code on line 1
and defined in /Applications/MAMP/htdocs/compile/includes/AST.inc.php
on line 43
<<<
Any ideas, why I can't pass a null value?
For some reason:
function appendChildNode ( AST $aNewChild = NULL ) {
}
But now, I can call it 'legally' with no parameters, which I don't
want.
At least any reader would think, 'OK, passing no value is OK'.
Do we have other options?
Additionally: I'll go into details of the code soon, but does the
default value make to
exception disappear, since I passed no value at all to appendChildNode ?
As Rik pointed out, type hinting is a somewhat inconsistent operation in
PHP. *But this a new area for PHP, and I'm not sure it's been entirely
thought out yet (as seems to be with a lot of things in PHP).
Thx, Jerry! In fact, the app failed to pass a value as an argument to
appendChildNode ().
I'm building a parser generator and fetched a returned value from a
non-terminal symbol
from the wrong (let's say) stack frame.
Fixed it, removed the ' = NULL' - and things work fine.
Thx again for all quick answers!
..oO(seaside)
>On 13 Jan., 04:00, "Rik Wasmus" <luiheidsgoe... @hotmail.comwro te:
>For some reason:
function appendChildNode ( AST $aNewChild = NULL ) {
}
But now, I can call it 'legally' with no parameters, which I don't
want.
Correct. It's the same as if you explicitly pass NULL.
>At least any reader would think, 'OK, passing no value is OK'.
Do we have other options?
For what? It does exactly what you described in your original posting.
Micha
it is absolutely inconsistent and bad design. null should assume the role of
any type, but not its own type. by saying = null, you are defining a default
value in any other normal cases. here it happens to mean something else.
the slightest inconsistent is inconsistent to me.
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