Call class function from within another function?

Hey fellow nerds,

Take this code for example:

class hello {
function world() {
echo "Hello";
}
}

$hello = new hello();

function writeHelloWorld() {
$hello->world();
}

writeHelloWorld();

I get this error

Fatal error: Call to a member function on a non-object in (points to
"$hello->world();" line)

Why is this?

Robbie

robbiesmith79 wrote:
> Hey fellow nerds,
>
> Take this code for example:
>
> class hello {
> function world() {
> echo "Hello";
> }
> }
>
> $hello = new hello();
>
> function writeHelloWorld() {
> $hello->world();
> }
>
> writeHelloWorld();
>
> I get this error
>
> Fatal error: Call to a member function on a non-object in (points to
> "$hello->world();" line)
>
> Why is this?
>
> Robbie

Because $hello is not in scope within the function writeHelloWorld

robbiesmith79 wrote:
> Hey fellow nerds,
>
> Take this code for example:
>
> class hello {
> function world() {
> echo "Hello";
> }
> }
>
> $hello = new hello();
>
> function writeHelloWorld() {
> $hello->world();
> }
>
> writeHelloWorld();
>
> I get this error
>
> Fatal error: Call to a member function on a non-object in (points to
> "$hello->world();" line)
>
> Why is this?
>
> Robbie

It's bad scope.
You could do (bad way):
--------------------------------

$hello = new hello();

function writeHelloWorld() {
global $hello;
$hello->world();
}

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

or (good way):

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

$hello = new hello();

function writeHelloWorld($hello) {
$hello->world();
}

writeHelloWorld($hello);
--------------------------------
best regaards
Piotr N

Fantastic!

Piotr schrieb:

> $hello = new hello();
>
> function writeHelloWorld($hello) {
> $hello->world();
> }

// Typehint to make sure
// that method world() is available
function writeHelloWorld( hello $hello )
{
$hello->world();
}

Greetings,
Thomas


--
Ce n'est pas parce qu'ils sont nombreux Ã* avoir tort qu'ils ont raison!
(Coluche)

On Sun, 04 May 2008 19:03:40 +0200, Piotr <spam@poczta.onet.pl> wrote:

> robbiesmith79 wrote:
>> Hey fellow nerds,
>> Take this code for example:
>> class hello {
>> function world() {
>> echo "Hello";
>> }
>> }
>> $hello = new hello();
>> function writeHelloWorld() {
>> $hello->world();
>> }
>> writeHelloWorld();
>> I get this error
>> Fatal error: Call to a member function on a non-object in (points to
>> "$hello->world();" line)
>> Why is this?
>> Robbie
>
> It's bad scope.
> You could do (bad way):
> --------------------------------
>
> $hello = new hello();
>
> function writeHelloWorld() {
> global $hello;
> $hello->world();
> }
>
> --------------------------------
>
> or (good way):
>
> --------------------------------
>
> $hello = new hello();
>
> function writeHelloWorld($hello) {
> $hello->world();
> }
>
> writeHelloWorld($hello);
> --------------------------------


Either that, or depending on the need:

class hello{
static function world(){
echo "Hello";
}
}
function writeHelloWorld(){
hello::world();
}
--
Rik Wasmus