Overwriting functions in PHP?

[Lars Plessmann]

Is ist possible, to overwrite a function in PHP by calling the parent
function that has the same name?


I have a classA and a classB with a method funcDisplay():

----------------------------------

classA {

function funcDisplay()
{
print "line 1A";
print "line 2A";
}

}

-----------------------------------

classB extends classA
{

functionm funcDisplay
{
$this->funcDisplay( );
// should call the func of the parent class!

print "line 1B";
print "line 2B";
}

}


When I test this, I get an memory failure and a fatal error message from
windows. I think $this->funcDisplay is an endless loop by calling
itself. But how can I tell this the PHP compiler to use the upper class?

I want to call from funcDisplay() from classB the funcDisplay() in
classA, that I get the inherited function of the parent class like the
following result:

----
line 1A
line 2A
line 1B
line 1B
----



I thank you in advance,

Lars

[Garp]

Re: Overwriting functions in PHP?


"Lars Plessmann" <Lars.Plessmann @gmx.de> wrote in message
news:c72lhu$hi7 $04$2@news.t-online.com...[color=blue]
> Is ist possible, to overwrite a function in PHP by calling the parent
> function that has the same name?[/color]
<snip>

Yes, use parent: http://uk.php.net/manual/en/keyword.parent.php.

The example given is:
<?php
class A {
function example() {
echo "I am A::example() and provide basic functionality.< br
/>\n";
}
}

class B extends A {
function example() {
echo "I am B::example() and provide additional
functionality.< br />\n";
parent::example ();
}
}

$b = new B;

// This will call B::example(), which will in turn call A::example().
$b->example();
?>


HTH
Garp

[Adriaan]

Re: Overwriting functions in PHP?

"Lars Plessmann" wrote[color=blue]
> $this->funcDisplay( );
> // should call the func of the parent class![/color]

No, this is called recursion, and like you expected this calls itself, until
it runs out of memory.
[color=blue]
> But how can I tell this the PHP compiler to use the upper class?[/color]

See http://php.net/keyword.parent

Adriaan

[Lars Plessmann]

Re: Overwriting functions in PHP?

Lars Plessmann wrote:
[color=blue]
> Is ist possible, to overwrite a function in PHP by calling the parent
> function that has the same name?
>
>
> I have a classA and a classB with a method funcDisplay():
>
> ----------------------------------
>
> classA {
>
> function funcDisplay()
> {
> print "line 1A";
> print "line 2A";
> }
>
> }
>
> -----------------------------------
>
> classB extends classA
> {
>
> functionm funcDisplay
> {
> $this->funcDisplay( );
> // should call the func of the parent class!
>
> print "line 1B";
> print "line 2B";
> }
>
> }
>
>
> When I test this, I get an memory failure and a fatal error message from
> windows. I think $this->funcDisplay is an endless loop by calling
> itself. But how can I tell this the PHP compiler to use the upper class?
>
> I want to call from funcDisplay() from classB the funcDisplay() in
> classA, that I get the inherited function of the parent class like the
> following result:
>
> ----
> line 1A
> line 2A
> line 1B
> line 1B
> ----
>
>
>
> I thank you in advance,
>
> Lars[/color]

it works!!
many thanks :-)