Strange behavior with parser/methods?
| From: | T.S.Bhatnagar | Date: | Sun, 04 Feb 2001 21:43:20 +0000 |
| Subject: | Strange behavior with parser/methods? | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-38148@lists.php.net to get a copy of this message | ||
[script at end]
Does it seem strange that although object members can
store functions, they can't be used as methods?
That is, we can have
$TestObject->mTestMember = create_function('','echo
"TestMember<br>";');
but we can't do
$TestObject->mTestMember();
Can I get around this using clever placement of {}'s or ()'s?
Or do I have to make two separate calls, such as
$temp = $TestObject->mTestMember;
$temp();
At first glance, it seems like a parser problem.
But I couldn't get it to go away by placing ()'s
and {}'s... Perhaps I wasn't being clever enough.
Can anyone help? It seems odd that accessing members
as methods wouldn't be allowed, but variable functions
(http://www.php.net/manual/en/functions.variable-functions.php PHP Manual, Chap 12)
would be.
On the other hand, it's not safe to willy-nilly be
introducing methods to a class. But then again,
I can still do
$TestObject->mPreviouslyUndeclaredMember = 'Huh?';
so, I don't buy this line of reasoning.
Bug or language feature or other?
Thanks,
TSB
Here's a script which illustrates this problem...
<?php
class TestClass {
function TestMethod() {
echo "TestMethod<br>";
}
function Init() {
$this->mTestMember = create_function('','echo
"TestMember<br>";');
}
var $mTestMember;
}
$Tc = new TestClass;
//case 1: works (standard method invocation)
$Tc->TestMethod();
$Tc->Init();
//case 2: doesn't work (member as method)
//$Tc->mTestMember(); //doesn't work
//case 3: works (two-step)
$holder = $Tc->mTestMember;
$holder();
?>