Passing by Reference

[Sanders Kaufman]

I think I finally get the idea of passing by reference, but I'm
struggling with the syntax and grammar of it.

I've got an object and I want to send it to a function to have its
properties modified like so:

class MyClass {
var $a;
function MyClass(){
$this->a=0;
}
 
function fnClassify($oClass){
$oClass->a = 1;
return true;
}
 
$oMyClass = new MyClass();
echo $oMyClass->a;    // displays "0"
 
$bSuccess = fnClassify($oMyClass);
echo $oMyClass->a;    // displays "1"
 

Unfortunately, the syntax is wrong somehow. At some point, I should be
passing a reference to, instead of the value of, $oMyClass - but I don't
know where or how.

Can someone help me out here?

[gosha bine]

On 11.09.2007 14:20 Sanders Kaufman wrote:

I think I finally get the idea of passing by reference, but I'm
struggling with the syntax and grammar of it.

I've got an object and I want to send it to a function to have its
properties modified like so:

class MyClass {
    var $a;
    function MyClass(){
        $this->a=0;
}

function fnClassify($oClass){
    $oClass->a = 1;
    return true;
}

$oMyClass = new MyClass();
echo $oMyClass->a;    // displays "0"

$bSuccess = fnClassify($oMyClass);
echo $oMyClass->a;    // displays "1"
 

Unfortunately, the syntax is wrong somehow. At some point, I should be
passing a reference to, instead of the value of, $oMyClass - but I don't
know where or how.

Can someone help me out here?

In php4 you should prepend & to any variable or a function parameter
containing or refering to an object. Examples include:

function foobar(&$someObject)

$someObj = &new ClassName;

$someObj = &$anotherObj;

Every function that returns an object, should return by reference (use &
twice)

function &getObject() {
....
return &$someObjectVar;
}

Again, all this is needed only for php4. I can't think of a good reason
to use it.
--
gosha bine

makrell ~ http://www.tagarga.com/blok/makrell
php done right ;) http://code.google.com/p/pihipi

[C.]

On 11 Sep, 13:20, Sanders Kaufman <[e-mail]:

I think I finally get the idea of passing by reference, but I'm
struggling with the syntax and grammar of it.

I've got an object and I want to send it to a function to have its
properties modified like so:

class MyClass {
        var $a;
        function MyClass(){
                $this->a=0;

}

function fnClassify($oClass){
        $oClass->a = 1;
        return true;

}

$oMyClass = new MyClass();
echo $oMyClass->a;   // displays "0"

$bSuccess = fnClassify($oMyClass);
echo $oMyClass->a;   // displays "1"
 

Unfortunately, the syntax is wrong somehow. At some point, I should be
passing a reference to, instead of the value of, $oMyClass - but I don't
know where or how.

Can someone help me out here?

I'm confused - do the comments show what you expect to happen? or what
*did* happen?

(the code you've posted shouldn't run - you're missing a '}' from the
method declaration).

IIRC PHP4 will pass the value of an object but PHP5 will pass a
reference to the object unless you specifically tell it to do
something different:

function fnClassify(&$oClass){

C.

[Sanders Kaufman]

C. wrote:

On 11 Sep, 13:20, Sanders Kaufman <[e-mail]:

>I think I finally get the idea of passing by reference, but I'm
struggling with the syntax and grammar of it.

I've got an object and I want to send it to a function to have its
properties modified like so:

class MyClass {
        var $a;
        function MyClass(){
                $this->a=0;
        };
}
function fnClassify($oClass){
        $oClass->a = 1;
        return true;
}
$oMyClass = new MyClass();
echo $oMyClass->a;   // displays "0"
$bSuccess = fnClassify($oMyClass);
echo $oMyClass->a;   // displays "1"

Unfortunately, the syntax is wrong somehow. At some point, I should be
passing a reference to, instead of the value of, $oMyClass - but I don't
know where or how.

Can someone help me out here?

I'm confused - do the comments show what you expect to happen? or what
*did* happen?

They show what I *want* to happen.

(the code you've posted shouldn't run - you're missing a '}' from the
method declaration).

OK - it's fixed.
But I'm still not sure where to put my "&" thingies.

IIRC PHP4 will pass the value of an object but PHP5 will pass a
reference to the object unless you specifically tell it to do
something different:

function fnClassify(&$oClass){

So... I should put my ByRef "&" in the function definition, not in the
function call - right?

[Sanders Kaufman]

gosha bine wrote:

On 11.09.2007 14:20 Sanders Kaufman wrote:

In php4 you should prepend & to any variable or a function parameter
containing or refering to an object. Examples include:

"Containing or referring, eh?
So - I should put the byref "&" thing in BOTH the function call AND the
function defintion?
Like thus:
function fnClassify(&$oClass){
$oClass->a = 1;
return true;
}
.... and so:
$bSuccess = fnClassify(&$oMyClass);

Again, all this is needed only for php4. I can't think of a good reason
to use it.

That's where I'm at with this thing - 4.

[gosha bine]

On 11.09.2007 15:02 Sanders Kaufman wrote:

gosha bine wrote:

>On 11.09.2007 14:20 Sanders Kaufman wrote:

>In php4 you should prepend & to any variable or a function parameter
containing or refering to an object. Examples include:

"Containing or referring, eh?
So - I should put the byref "&" thing in BOTH the function call AND the
function defintion?

no, only in the declaration

Like thus:
function fnClassify(&$oClass){
$oClass->a = 1;
return true;
}

correct

... and so:
$bSuccess = fnClassify(&$oMyClass);

incorrect

>

>Again, all this is needed only for php4. I can't think of a good
reason to use it.

That's where I'm at with this thing - 4.

good luck ;)
--
gosha bine

makrell ~ http://www.tagarga.com/blok/makrell
php done right ;) http://code.google.com/p/pihipi

[Sanders Kaufman]

gosha bine wrote:

On 11.09.2007 15:02 Sanders Kaufman wrote:

>gosha bine wrote:

>>On 11.09.2007 14:20 Sanders Kaufman wrote:

>>In php4 you should prepend & to any variable or a function parameter
containing or refering to an object. Examples include:

"Containing or referring, eh?
So - I should put the byref "&" thing in BOTH the function call AND
the function defintion?

no, only in the declaration

>Like thus:
function fnClassify(&$oClass){
$oClass->a = 1;
return true;
}

correct

>... and so:
$bSuccess = fnClassify(&$oMyClass);

incorrect

>>

>>Again, all this is needed only for php4. I can't think of a good
reason to use it.

That's where I'm at with this thing - 4.

good luck ;)

T'worked. Thanks. Gimme the name of a charity and maybe I'll Paypal
'em a few bucks.

[gosha bine]

On 11.09.2007 15:39 Sanders Kaufman wrote:

gosha bine wrote:

>On 11.09.2007 15:02 Sanders Kaufman wrote:

>>gosha bine wrote:
On 11.09.2007 14:20 Sanders Kaufman wrote:

In php4 you should prepend & to any variable or a function parameter
containing or refering to an object. Examples include:

"Containing or referring, eh?
So - I should put the byref "&" thing in BOTH the function call AND
the function defintion?

no, only in the declaration

>>Like thus:
function fnClassify(&$oClass){
$oClass->a = 1;
return true;
}

correct

>>... and so:
$bSuccess = fnClassify(&$oMyClass);

incorrect

>>>
Again, all this is needed only for php4. I can't think of a good
reason to use it.

That's where I'm at with this thing - 4.

good luck ;)

T'worked. Thanks. Gimme the name of a charity and maybe I'll Paypal
'em a few bucks.

You must be 18+ to do this. Are you?
--
gosha bine

makrell ~ http://www.tagarga.com/blok/makrell
php done right ;) http://code.google.com/p/pihipi

[Steve]

>T'worked. Thanks. Gimme the name of a charity and maybe I'll Paypal 'em

>a few bucks.

You must be 18+ to do this. Are you?

ROFLMAO !!!