Method/function overloading

[Matthew]

Am I correct in thinking there is no method/function overloading of any
kind in any version of PHP?

Thanks,

Matthew

[Captain Paralytic]

Re: Method/function overloading

On 10 Dec, 14:17, Matthew <matt...@spamki ller.comwrote:

Am I correct in thinking there is no method/function overloading of any
kind in any version of PHP?
>
Thanks,
>
Matthew

Depends if any of the about 758,000 items found by putting the words

overloading php

into Google fit the bill.

[Matthew]

Re: Method/function overloading

Captain Paralytic emailed this:

On 10 Dec, 14:17, Matthew <matt...@spamki ller.comwrote:

>Am I correct in thinking there is no method/function overloading of any
>kind in any version of PHP?
>>
>Thanks,
>>
>Matthew

>
Depends if any of the about 758,000 items found by putting the words
>
overloading php
>
into Google fit the bill.

I did that before posting, and got hits for class, property, method, and
an extension for overloading. When I looked in manual I found a function
called overload() which will enable method and property overloading in PHP
versions 4 >= 4.2.0.

I can't seem to find a simple answer to my question, hence my post, which
is specific to methods/functions (including constructors). I was unable to
find an example of what I would call 'method overloading' that you would
use in C++, Java, C#, etc..

EG.

function DoThis()
{
//something
}
function DoThis($var1)
{
//something
}
function DoThis($var1, $var2)
{
//something
}

the method that runs is chosen simply on the basis of the number of arguments.

Thanks.

[Rik Wasmus]

Re: Method/function overloading

On Mon, 10 Dec 2007 15:17:56 +0100, Matthew <matthew@spamki ller.comwrote:

Am I correct in thinking there is no method/function overloading of any
kind in any version of PHP?

RTFM:

http://nl2.php.net/manual/en/language.oop5.overloading.php

--
Rik Wasmus

[Captain Paralytic]

Re: Method/function overloading

On 10 Dec, 14:56, Matthew <matt...@spamki ller.comwrote:

Captain Paralytic emailed this:
>

On 10 Dec, 14:17, Matthew <matt...@spamki ller.comwrote:

Am I correct in thinking there is no method/function overloading of any
kind in any version of PHP?

>

Thanks,

>

Matthew

>

Depends if any of the about 758,000 items found by putting the words

>

overloading php

>

into Google fit the bill.

>
I did that before posting, and got hits for class, property, method, and
an extension for overloading. When I looked in manual I found a function
called overload() which will enable method and property overloading in PHP
versions 4 >= 4.2.0.
>
I can't seem to find a simple answer to my question, hence my post,

Your question was whether you were right in "thinking there is no
method/function overloading of any kind in any version of PHP"

You have now said that "I found a function called overload() which
will enable method and property overloading"

So it seems pretty obvious to me that you already had the answer to
the question you asked.

[Jerry Stuckle]

Re: Method/function overloading

Matthew wrote:

Am I correct in thinking there is no method/function overloading of any
kind in any version of PHP?
>
Thanks,
>
Matthew
>

Not in the way I think you're saying - where two methods in the same
class (or both not in any class) can have the same name but different
parameter lists . PHP hasn't gotten that far yet. Maybe in a future
release.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
=============== ===

[ZeldorBlat]

Re: Method/function overloading

On Dec 10, 9:56 am, Matthew <matt...@spamki ller.comwrote:

Captain Paralytic emailed this:
>

On 10 Dec, 14:17, Matthew <matt...@spamki ller.comwrote:

Am I correct in thinking there is no method/function overloading of any
kind in any version of PHP?

>

Thanks,

>

Matthew

>

Depends if any of the about 758,000 items found by putting the words

>

overloading php

>

into Google fit the bill.

>
I did that before posting, and got hits for class, property, method, and
an extension for overloading. When I looked in manual I found a function
called overload() which will enable method and property overloading in PHP
versions 4 >= 4.2.0.
>
I can't seem to find a simple answer to my question, hence my post, which
is specific to methods/functions (including constructors). I was unable to
find an example of what I would call 'method overloading' that you would
use in C++, Java, C#, etc..
>
EG.
>
function DoThis()
{
//something}
>
function DoThis($var1)
{
//something}
>
function DoThis($var1, $var2)
{
//something
>
}
>
the method that runs is chosen simply on the basis of the number of arguments.
>
Thanks.

You can achieve the same thing by using default values for function
parameters:

function DoThis($var1 = 'foo', $var2 = 'bar')

If you don't provide values for those parameters it will take the
default instead.

[Matthew]

Re: Method/function overloading

Jerry Stuckle emailed this:

Matthew wrote:

>Am I correct in thinking there is no method/function overloading of
>any kind in any version of PHP?
>>
>Thanks,
>>
>Matthew
>>

>
Not in the way I think you're saying - where two methods in the same
class (or both not in any class) can have the same name but different
parameter lists . PHP hasn't gotten that far yet. Maybe in a future
release.

Thanks Jerry - this is what I meant and wanted to know.
Cheers.

[Matthew]

Re: Method/function overloading

ZeldorBlat emailed this:

On Dec 10, 9:56 am, Matthew <matt...@spamki ller.comwrote:

>Captain Paralytic emailed this:
>>

>>On 10 Dec, 14:17, Matthew <matt...@spamki ller.comwrote:
>>>Am I correct in thinking there is no method/function overloading of any
>>>kind in any version of PHP?
>>>Thanks,
>>>Matthew
>>Depends if any of the about 758,000 items found by putting the words
>>overloading php
>>into Google fit the bill.

>I did that before posting, and got hits for class, property, method, and
>an extension for overloading. When I looked in manual I found a function
>called overload() which will enable method and property overloading in PHP
>versions 4 >= 4.2.0.
>>
>I can't seem to find a simple answer to my question, hence my post, which
>is specific to methods/functions (including constructors). I was unable to
>find an example of what I would call 'method overloading' that you would
>use in C++, Java, C#, etc..
>>
>EG.
>>
>function DoThis()
>{
> //something}
>>
>function DoThis($var1)
>{
> //something}
>>
>function DoThis($var1, $var2)
>{
> //something
>>
>}
>>
>the method that runs is chosen simply on the basis of the number of arguments.
>>
>Thanks.

>
You can achieve the same thing by using default values for function
parameters:
>
function DoThis($var1 = 'foo', $var2 = 'bar')
>
If you don't provide values for those parameters it will take the
default instead.

It's not the same thing. But thanks for the hint.
Cheers.

[ZeldorBlat]

Re: Method/function overloading

On Dec 10, 11:40 am, Matthew <matt...@spamki ller.comwrote:

ZeldorBlat emailed this:
>
>
>

On Dec 10, 9:56 am, Matthew <matt...@spamki ller.comwrote:

Captain Paralytic emailed this:

>

>On 10 Dec, 14:17, Matthew <matt...@spamki ller.comwrote:
>>Am I correct in thinking there is no method/function overloading of any
>>kind in any version of PHP?
>>Thanks,
>>Matthew
>Depends if any of the about 758,000 items found by putting the words
>overloading php
>into Google fit the bill.
I did that before posting, and got hits for class, property, method, and
an extension for overloading. When I looked in manual I found a function
called overload() which will enable method and property overloading in PHP
versions 4 >= 4.2.0.

>

I can't seem to find a simple answer to my question, hence my post, which
is specific to methods/functions (including constructors). I was unable to
find an example of what I would call 'method overloading' that you would
use in C++, Java, C#, etc..

>

EG.

>

function DoThis()
{
//something}

>

function DoThis($var1)
{
//something}

>

function DoThis($var1, $var2)
{
//something

>

}

>

the method that runs is chosen simply on the basis of the number of arguments.

>

Thanks.

>

You can achieve the same thing by using default values for function
parameters:

>

function DoThis($var1 = 'foo', $var2 = 'bar')

>

If you don't provide values for those parameters it will take the
default instead.

>
It's not the same thing. But thanks for the hint.
Cheers.

I didn't say it was the same. But you can achieve the same effect.
I've seen plenty of constructs like this:

function DoThis() {
return DoThis('foo');
}

function DoThis($var1) {
return DoThis($var1, 'bar');
}

functionDoThis( $var1, $var2) {
//do something
}


In PHP the equivalent is:

function DoThis($var1 = 'foo', $var2 = 'bar') {
//do something
}

[Toby A Inkster]

Re: Method/function overloading

Matthew wrote:

Am I correct in thinking there is no method/function overloading of any
kind in any version of PHP?

OK. In some other programming language you might have:

function reverse (int $i)
{ return 0 - $i; }

function reverse (string $s)
{ return strrev($s); }

function reverse (array $a)
{ return array_reverse($ a); }

In PHP you'd write:

function _reverse_int ($i)
{ return 0 - $i; }

function _reverse_string ($s)
{ return strrev($s); }

function _reverse_array ($a)
{ return array_reverse($ a); }

function reverse ($x)
{
if (is_numeric($x) )
return _reverse_int($x );
elseif (is_string($x))
return _reverse_string ($x);
elseif (is_array($x))
return _reverse_array( $x);
else
{
$emsg = sprintf("Can't reverse type '%s'",
gettype($x));
throw new Exception($emsg );
}
}

Different syntax, same effect.

Also, with regards to the number of arguments, consider:

function add_ints (int $a, int $b)
{ return $a + $b; }

function add_ints (int $a, int $b, int $c)
{ return $a + $b + $c; }

In PHP you could use a similar technique to what I showed before:

function _add_ints__2 ($a, $b)
{ return $a + $b; }

function _add_ints__3 ($a, $b, $c)
{ return $a + $b + $c; }

function add_ints ()
{
if (func_num_args( )==2)
return call_user_func_ array('_add_int s__2',
func_get_args() );
elseif (func_num_args( )==3)
return call_user_func_ array('_add_int s__3',
func_get_args() );
}

But it would be simpler to rewrite the function as:

function add_ints ($a=0, $b=0, $c=0)
{
return $a + $b + $c;
}

Or:

function add_ints ()
{
return array_reduce(
func_get_args() ,
create_function ('$a,$b', 'return $a+$b;')
);
}

--
Toby A Inkster BSc (Hons) ARCS
[Geek of HTML/SQL/Perl/PHP/Python/Apache/Linux]
[OS: Linux 2.6.17.14-mm-desktop-9mdvsmp, up 3 days, 22:33.]

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