bug in object implementation?

hkeach

There appears to be a bug in the implementation of inheritance in PHP4. Has anyone else seen this?

I tested 3 scenarios:

Extend class defined in current file in included file. This works.
Extend class defined in included file in another included file. This works
Extend class defined in included file in current file. This fails!! The error message is 'Cannot instantiate non-existent class: class1'

file 'class1.php'-------------------------
<BODY>
<?php
include("class2.php");
include("class3.php");

//this works: included file extends class in current file
$Fred = new Class2;
//this works: included file extends class in included file
$Mary = new Class3;
// this fails!! current file extends class in included file
$Sam = new Class1;
exit;

class Class1 extends Class2
{
function Class1()
{
print("hello from class1 \n");
}
}

class Class1a
{
function Class1a()
{
print("Hello from class1a ");
}
}
?>

</BODY>

file 'class2.php'--------------------------
<?php
class Class2 extends Class1a
{
function Class2()
{
$this->Class1a();
print("Hello from class2 \n");

}
}

?>

file 'class3.php'-------------------------
<?php
class Class3 extends Class2
{
function Class3()
{
$this->Class2();
print("hello from class3 \n");
}
}
?>

Anon

I think it has more to do with the including and the order in which you have defined your classes. I dont think its a bug in the object implementation.
this works, pretty much the same code:

<?php
$Fred = new Class2;
$Mary = new Class3;
$Sam = new Class1;

class Class1a {
function Class1a(){
print("Hello from class1a ");
}
}

class Class2 extends Class1a {
function Class2(){
$this->Class1a();
print("Hello from class2 \n");
}
}

class Class1 extends Class2 {
function Class1(){
print("hello from class1 \n");
}
}

class Class3 extends Class2 {
function Class3(){
$this->Class2();
print("hello from class3 \n");
}
}
?>

hkeach

If the developers intentionally limited inheritance to classes in the same file, that would not be a very useful implementation.

Anon

<?php
include(\"class2.php\");
include(\"class3.php\");

class Class1 extends Class2 {
function Class1() {
print(\"hello from class1 \n\");
}
}

class Class1a {
function Class1a(){
print(\"Hello from class1a \");
}
}

$Fred = new Class2;
$Mary = new Class3;
$Sam = new Class1;
exit;
?>

this works, I guess including breaks code a little