Re: [PHP] Re: PHP class question
Shawn McKenzie wrote:
Shawn McKenzie wrote:
Peter van der Does wrote:
On Thu, 21 May 2009 14:08:11 -0500
Shawn McKenzie wrote:
This doesn't make sense. You say "class A needs to be extended with
another class", however what you show below is "class A extending
framework_class".
I worded it wrong, I apologize.
Class A needs to be an extension of the framework class.
Well I guess from my point of view there are several ways depending upon
the requirements. Others that are better with OOP will chime in I'm sure.
This I'll get flamed for, but you can use one instance of core as a global:
class A extends framework_class {
var $core;
function A() {
$this->core =& $GLOBALS['core'];
$this->core->go();
}
}
//in global scope in bootstrap or whatever
$core = new core();
Along the same lines but more OOP and without globals, maybe use a
registry class and store core in the registry. This also uses one
instance of core:
class Registry {
protected $_objects = array();
function set($name, &$object) {
$this->_objects[$name] =& $object;
}
function &get($name) {
return $this->_objects[$name];
}
}
class A extends framework_class {
var $core;
function A(&$registry) { //dunno if you need a reference here or not
$this->core = $registry->get('core');
$this->core->go();
}
//i guess you could also pass in core, but registry will give you all
objects in the registry
//function A(&core) {
//$this->core = $core;
//$this->core->go();
//}
}
//this is in your bootstrap or whatever
$core = new core();
$registry = new registry();
$registry->set('core', $core);
Or, if you don't need an object, call it statically:
class A extends framework_class {
function A() {
core::go();
}
}
I guess you could always do a singleton so that you always have the same
instance. Add something like this to the core class (not tested):
static $_instance;
function getInstance() {
if(self::$_instance === null) {
self::$_instance = new self();
}
return self::$_instance;
}
Then you can do:
class A extends framework_class {
var $core;
function A() {
$this->core = core::getInstance();
$this->core->go();
}
}
bullseye, static is the way to approach when you only need a single instance
however you don't always need to include a referent to the instance
inside your class.. you can easily
core::getInstance()->go()
or
core::go()
and have class core store an instance of itself
class core {
var $instance;
function getInstance()
..etc - been so long since i touched php4
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Re: [PHP] Re: PHP class question
Shawn McKenzie wrote:
> Peter van der Does wrote:
>> On Thu, 21 May 2009 14:08:11 -0500
>> Shawn McKenzie wrote:
>>
>>
>>> This doesn't make sense. You say "class A needs to be extended with
>>> another class", however what you show below is "class A extending
>>> framework_class".
>>>
>> I worded it wrong, I apologize.
>> Class A needs to be an extension of the framework class.
>>
>
> Well I guess from my point of view there are several ways depending upon
> the requirements. Others that are better with OOP will chime in I'm sure.
>
> This I'll get flamed for, but you can use one instance of core as a global:
>
> class A extends framework_class {
> var $core;
>
> function A() {
> $this->core =& $GLOBALS['core'];
> $this->core->go();
> }
> }
>
> //in global scope in bootstrap or whatever
> $core = new core();
>
> Along the same lines but more OOP and without globals, maybe use a
> registry class and store core in the registry. This also uses one
> instance of core:
>
> class Registry {
> protected $_objects = array();
>
> function set($name, &$object) {
> $this->_objects[$name] =& $object;
> }
>
> function &get($name) {
> return $this->_objects[$name];
> }
> }
>
> class A extends framework_class {
> var $core;
>
> function A(&$registry) { //dunno if you need a reference here or not
> $this->core = $registry->get('core');
> $this->core->go();
> }
> //i guess you could also pass in core, but registry will give you all
> objects in the registry
> //function A(&core) {
> //$this->core = $core;
> //$this->core->go();
> //}
> }
>
> //this is in your bootstrap or whatever
> $core = new core();
> $registry = new registry();
> $registry->set('core', $core);
>
> Or, if you don't need an object, call it statically:
>
> class A extends framework_class {
>
> function A() {
> core::go();
> }
> }
>
I guess you could always do a singleton so that you always have the same
instance. Add something like this to the core class (not tested):
static $_instance;
function getInstance() {
if(self::$_instance === null) {
self::$_instance = new self();
}
return self::$_instance;
}
Then you can do:
class A extends framework_class {
var $core;
function A() {
$this->core = core::getInstance();
$this->core->go();
}
}
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Thanks!
-Shawn
http://www.spidean.com
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Re: [PHP] Re: PHP class question
Peter van der Does wrote:
> On Thu, 21 May 2009 14:08:11 -0500
> Shawn McKenzie wrote:
>
>
>> This doesn't make sense. You say "class A needs to be extended with
>> another class", however what you show below is "class A extending
>> framework_class".
>>
>
> I worded it wrong, I apologize.
> Class A needs to be an extension of the framework class.
>
Well I guess from my point of view there are several ways depending upon
the requirements. Others that are better with OOP will chime in I'm sure.
This I'll get flamed for, but you can use one instance of core as a global:
class A extends framework_class {
var $core;
function A() {
$this->core =& $GLOBALS['core'];
$this->core->go();
}
}
//in global scope in bootstrap or whatever
$core = new core();
Along the same lines but more OOP and without globals, maybe use a
registry class and store core in the registry. This also uses one
instance of core:
class Registry {
protected $_objects = array();
function set($name, &$object) {
$this->_objects[$name] =& $object;
}
function &get($name) {
return $this->_objects[$name];
}
}
class A extends framework_class {
var $core;
function A(&$registry) { //dunno if you need a reference here or not
$this->core = $registry->get('core');
$this->core->go();
}
//i guess you could also pass in core, but registry will give you all
objects in the registry
//function A(&core) {
//$this->core = $core;
//$this->core->go();
//}
}
//this is in your bootstrap or whatever
$core = new core();
$registry = new registry();
$registry->set('core', $core);
Or, if you don't need an object, call it statically:
class A extends framework_class {
function A() {
core::go();
}
}
--
Thanks!
-Shawn
http://www.spidean.com
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Re: [PHP] Re: PHP class question
On Thu, 21 May 2009 14:08:11 -0500 Shawn McKenzie wrote: > > This doesn't make sense. You say "class A needs to be extended with > another class", however what you show below is "class A extending > framework_class". > I worded it wrong, I apologize. Class A needs to be an extension of the framework class. -- Peter van der Does GPG key: E77E8E98 IRC: Ganseki on irc.freenode.net Blog: http://blog.avirtualhome.com Forums: http://forums.avirtualhome.com Jabber ID: pvanderd...@gmail.com GetDeb Package Builder http://www.getdeb.net - Software you want for Ubuntu -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Re: PHP class question
Peter van der Does wrote:
> I have the following situation.
>
> I wrote some software and split it up into functionality:
>
> class core {
> function go{
> }
> }
>
> class A extends core {
> // PHP4 constructor
> function A {
> $this->go();
> }
>
> }
>
> class B extends core {
> }
>
> In core I define functions and variables that are to be used
> through out my program and to address those functions/variables I just
> use $this-> .
>
> Now I ran into a situation where class A needs to be extended with
> another class. This is not my choice, it's part of a framework I have
> to use.
This doesn't make sense. You say "class A needs to be extended with
another class", however what you show below is "class A extending
framework_class".
Show your classes and we can help I think.
> Currently I solved this by doing this:
>
> class A extends framework_class {
> $var core;
>
> // PHP4 constructor
> function A {
> $this->core = new core();
> $this->core->go();
> }
> }
>
> The question I have, is this a good solution, is it the only solution
> or are there different ways to tackle this?
> As you might see it needs to run in PHP4.
>
I'm sure there are. This doesn't look right to me, but I'm confused by
your examples.
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Thanks!
-Shawn
http://www.spidean.com
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[PHP] Re: PHP class question
Peter van der Does wrote:
I have the following situation.
I wrote some software and split it up into functionality:
class core {
function go{
}
}
class A extends core {
// PHP4 constructor
function A {
$this->go();
}
}
class B extends core {
}
In core I define functions and variables that are to be used
through out my program and to address those functions/variables I just
use $this-> .
Now I ran into a situation where class A needs to be extended with
another class. This is not my choice, it's part of a framework I have
to use.
Currently I solved this by doing this:
class A extends framework_class {
$var core;
// PHP4 constructor
function A {
$this->core = new core();
$this->core->go();
}
}
The question I have, is this a good solution, is it the only solution
or are there different ways to tackle this?
As you might see it needs to run in PHP4.
has to extend? if it *has* to extend then you have no choice, but you
may want to look up on class inheritance, specifically inheritance vs
composition.
also the "isa" / "hasa" rule /should/ always apply.
which one of the following is true
1: A isa framework_class_name
2: A hasa framework_class_name
if it's 1 then you extend
if it's 2 then A should contain an instance of framework_class
eg:
class A
{
var $framework_class = new framework_class_name();
}
you can also always proxy the methods you need.
all in, this appears to be a design pattern issue and really can't help
any more unless you give some specifics. (like the source of your
classes and the framework class you need to extend)
regards,
nathan
incidentally, I play inheritance vs composition as game with my 4 year
old son, and he's really good - the untainted mind of a child can easily
solve things us older types find more complex.
eg: car isa wheel, car hasa wheel
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[PHP] PHP class question
I have the following situation.
I wrote some software and split it up into functionality:
class core {
function go{
}
}
class A extends core {
// PHP4 constructor
function A {
$this->go();
}
}
class B extends core {
}
In core I define functions and variables that are to be used
through out my program and to address those functions/variables I just
use $this-> .
Now I ran into a situation where class A needs to be extended with
another class. This is not my choice, it's part of a framework I have
to use.
Currently I solved this by doing this:
class A extends framework_class {
$var core;
// PHP4 constructor
function A {
$this->core = new core();
$this->core->go();
}
}
The question I have, is this a good solution, is it the only solution
or are there different ways to tackle this?
As you might see it needs to run in PHP4.
--
Peter van der Does
GPG key: E77E8E98
IRC: Ganseki on irc.freenode.net
Blog: http://blog.avirtualhome.com
Forums: http://forums.avirtualhome.com
Jabber ID: pvanderd...@gmail.com
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Re: [PHP] Class question
What does "$this->A(); "" do ?(in constructor of class B)
does it make another instance of class A, and if not why do I have to
parse vars to the A constructor ($this->A($var1,$var2))?.
I dont think that is what I want.
A can have many instances of B. B can have many instances of C.
A
B B B
B
Should not a instanse(object) of class B bee able to request av var of
the calling object (class A)?
Sorry about this stupid questions, I'm not a coder.
Thomas Munz wrote:
Use 'extends' syntax for sub classes
class A {
var $some_var;
var $class_B;
function A(){
$this->class_B = new B();
$this->some_var=2;
}
}
class B extends A {
var $class_C;
function B(){
$this->A();
$this->class_C = new C();
// $this->some_var= some_var_from_class_A; <-- $this->some_var
contains the value allready
}
}
class C extends A {
function C(){
$this->A();
// $this->some_var= some_var_from_class_A; <-- $this->some_var
contains the value allready
}
}
on Friday 15 September 2006 11:01, Roger Helgesen wrote:
I have 3 classes, CLASS A,B and C
class A {
var $some_var;
var $class_B;
function A(){
$this->class_B = new B();
$this->some_var=2;
}
}
class B {
var $some_var;
var $class_C;
function B(){
$this->class_C = new C();
$this->some_var= some_var_from_class_A;
}
}
class C {
var $some_var;
function C(){
$this->some_var= some_var_from_class_A;
}
}
How can class B and C get the value of $some_var_class_A without using
"$this->class_B = new B($some_var);"
roger helgesen
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Re: [PHP] Class question
Well in this example it will get to an infinite loop, but anyway like
Thomas said you must check into extending classes.
Andy
Thomas Munz wrote:
> Use 'extends' syntax for sub classes
>
> class A {
> var $some_var;
>var $class_B;
> function A(){
> $this->class_B = new B();
> $this->some_var=2;
> }
> }
>
> class B extends A {
> var $class_C;
> function B(){
> $this->A();
> $this->class_C = new C();
>// $this->some_var= some_var_from_class_A; <--
> $this->some_var contains the value allready
> }
> }
>
> class C extends A {
> function C(){
> $this->A();
> // $this->some_var= some_var_from_class_A; <--
> $this->some_var contains the value allready
> }
> }
>
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Re: [PHP] Class question
Use 'extends' syntax for sub classes
class A {
var $some_var;
var $class_B;
function A(){
$this->class_B = new B();
$this->some_var=2;
}
}
class B extends A {
var $class_C;
function B(){
$this->A();
$this->class_C = new C();
// $this->some_var= some_var_from_class_A; <-- $this->some_var
contains the value allready
}
}
class C extends A {
function C(){
$this->A();
// $this->some_var= some_var_from_class_A; <-- $this->some_var
contains the value allready
}
}
on Friday 15 September 2006 11:01, Roger Helgesen wrote:
> I have 3 classes, CLASS A,B and C
>
> class A {
> var $some_var;
>var $class_B;
> function A(){
> $this->class_B = new B();
> $this->some_var=2;
> }
> }
>
> class B {
> var $some_var;
>var $class_C;
> function B(){
> $this->class_C = new C();
> $this->some_var= some_var_from_class_A;
> }
> }
>
> class C {
> var $some_var;
>
> function C(){
> $this->some_var= some_var_from_class_A;
> }
> }
>
>
>
> How can class B and C get the value of $some_var_class_A without using
> "$this->class_B = new B($some_var);"
>
>
> roger helgesen
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[PHP] Class question
I have 3 classes, CLASS A,B and C
class A {
var $some_var;
var $class_B;
function A(){
$this->class_B = new B();
$this->some_var=2;
}
}
class B {
var $some_var;
var $class_C;
function B(){
$this->class_C = new C();
$this->some_var= some_var_from_class_A;
}
}
class C {
var $some_var;
function C(){
$this->some_var= some_var_from_class_A;
}
}
How can class B and C get the value of $some_var_class_A without using
"$this->class_B = new B($some_var);"
roger helgesen
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Re[2]: [PHP] PHP - class question
Hi,
Thursday, August 15, 2002, 5:17:00 AM, you wrote:
MA> Well, I actually have a full db class which has a connect and close method
MA> as well as query, fetch_array, etc... What I really want to know is how to
MA> use the methods in my db class from another class (myclass for example)..
MA> Do I include the db class from the myclass constructor and then set a
MA> myclass variable = to the db object?
MA> ie.
MA> class my_class {
MA> var $db;
MA> function my_class() {
MA> include('class_database.php');
MA> $this->db = new database;
MA> }
MA> ...
MA> }
MA> or is there a differnet or better way?
I set up interclass communication by having a global array for
references like this:
t;
}
}
class b {
var $a; //class a holder
//constructor
function b(){
global $classes;
//if the class already exists use it...
if(is_object($classes['a'])){
$this->a =& $classes['a'];
}
//otherwise create it...
else{
$this->a = new a();
}
$this->a->test();
}
}
$a1 =& new a();
$a1->t = 'This is a test';
$b1 = new b();
?>
whether it is better depends on usage, but it should be good for a db
class so you only make the one connection :)
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regards,
Tom
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Re: [PHP] PHP - class question
Do you know where I can find more info on how to use the scope resolution operator? My searches aren't giving much (at leant not mcuh regarding php) and in the manual, it only shows up momentarily as a note in the operators section... Mark "Nick Oostveen" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > If you are just trying to access a classes functions without creating an > instance of it you're probably looking to use the scope resolution operator > ::. For this to work all you have to do is ensure that the definition for > the class you wish to use is included into the file containing the class > you are trying to call the functions from. > > You would then call the functions as follows: > > ClassName::FunctionName(); > > At 02:43 PM 8/14/2002 -0400, you wrote: > >Hello, To begin.. i'm new to the list... > > > >I'm trying to learn good practices in OOP based PHP. I'm actually a bit new > >to OOP in general, but I've done quite a bit of reading and playing around > >with it in the past couple of months. > > > >What I'm trying to figure out is the proper way to call a class from a > >class. I dont mean by extending the class, but actaully just getting the > >functions... > > > >For instance... > > > >I'm trying to connect to a Database (database class) from my gen_XML class. > >Do I include the database class in the gen_XML constructor? Do I set a > >gen_XML variable as a database object (i.e. $this->mydb)? > > > >I hope my question makes some sense... > > > >Your help is appreciated... > > > >Mark Armendariz > > > > > > > >-- > >PHP General Mailing List (http://www.php.net/) > >To unsubscribe, visit: http://www.php.net/unsub.php > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] PHP - class question
That seems more like what I'm looking for.. Thank you, Nick... Mark "Nick Oostveen" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > If you are just trying to access a classes functions without creating an > instance of it you're probably looking to use the scope resolution operator > ::. For this to work all you have to do is ensure that the definition for > the class you wish to use is included into the file containing the class > you are trying to call the functions from. > > You would then call the functions as follows: > > ClassName::FunctionName(); > > At 02:43 PM 8/14/2002 -0400, you wrote: > >Hello, To begin.. i'm new to the list... > > > >I'm trying to learn good practices in OOP based PHP. I'm actually a bit new > >to OOP in general, but I've done quite a bit of reading and playing around > >with it in the past couple of months. > > > >What I'm trying to figure out is the proper way to call a class from a > >class. I dont mean by extending the class, but actaully just getting the > >functions... > > > >For instance... > > > >I'm trying to connect to a Database (database class) from my gen_XML class. > >Do I include the database class in the gen_XML constructor? Do I set a > >gen_XML variable as a database object (i.e. $this->mydb)? > > > >I hope my question makes some sense... > > > >Your help is appreciated... > > > >Mark Armendariz > > > > > > > >-- > >PHP General Mailing List (http://www.php.net/) > >To unsubscribe, visit: http://www.php.net/unsub.php > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] PHP - class question
Well, I actually have a full db class which has a connect and close method
as well as query, fetch_array, etc... What I really want to know is how to
use the methods in my db class from another class (myclass for example)..
Do I include the db class from the myclass constructor and then set a
myclass variable = to the db object?
ie.
class my_class {
var $db;
function my_class() {
include('class_database.php');
$this->db = new database;
}
...
}
or is there a differnet or better way?
Thanks
Mark
"Steve Bradwell" <[EMAIL PROTECTED]> wrote in message
57A1618E7109D311A97D0008C7EBB3A10119EF03@KITCHENER">news:57A1618E7109D311A97D0008C7EBB3A10119EF03@KITCHENER...
> I would suggest you write a method (called mydb() for example) that
connects
> to your database, and if needed, call it from your constructor like:
> $this->mydb(); This way you can always reuse the method from other code.
>
> hth,
> Steve.
>
> -Original Message-
> From: Mark Armendariz [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 14, 2002 2:44 PM
> To: [EMAIL PROTECTED]
> Subject: [PHP] PHP - class question
>
>
> Hello, To begin.. i'm new to the list...
>
> I'm trying to learn good practices in OOP based PHP. I'm actually a bit
new
> to OOP in general, but I've done quite a bit of reading and playing around
> with it in the past couple of months.
>
> What I'm trying to figure out is the proper way to call a class from a
> class. I dont mean by extending the class, but actaully just getting the
> functions...
>
> For instance...
>
> I'm trying to connect to a Database (database class) from my gen_XML
class.
> Do I include the database class in the gen_XML constructor? Do I set a
> gen_XML variable as a database object (i.e. $this->mydb)?
>
> I hope my question makes some sense...
>
> Your help is appreciated...
>
> Mark Armendariz
>
>
>
> --
> PHP General Mailing List (http://www.php.net/)
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Re: [PHP] PHP - class question
If you are just trying to access a classes functions without creating an instance of it you're probably looking to use the scope resolution operator ::. For this to work all you have to do is ensure that the definition for the class you wish to use is included into the file containing the class you are trying to call the functions from. You would then call the functions as follows: ClassName::FunctionName(); At 02:43 PM 8/14/2002 -0400, you wrote: >Hello, To begin.. i'm new to the list... > >I'm trying to learn good practices in OOP based PHP. I'm actually a bit new >to OOP in general, but I've done quite a bit of reading and playing around >with it in the past couple of months. > >What I'm trying to figure out is the proper way to call a class from a >class. I dont mean by extending the class, but actaully just getting the >functions... > >For instance... > >I'm trying to connect to a Database (database class) from my gen_XML class. >Do I include the database class in the gen_XML constructor? Do I set a >gen_XML variable as a database object (i.e. $this->mydb)? > >I hope my question makes some sense... > >Your help is appreciated... > >Mark Armendariz > > > >-- >PHP General Mailing List (http://www.php.net/) >To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] PHP - class question
I would suggest you write a method (called mydb() for example) that connects to your database, and if needed, call it from your constructor like: $this->mydb(); This way you can always reuse the method from other code. hth, Steve. -Original Message- From: Mark Armendariz [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 14, 2002 2:44 PM To: [EMAIL PROTECTED] Subject: [PHP] PHP - class question Hello, To begin.. i'm new to the list... I'm trying to learn good practices in OOP based PHP. I'm actually a bit new to OOP in general, but I've done quite a bit of reading and playing around with it in the past couple of months. What I'm trying to figure out is the proper way to call a class from a class. I dont mean by extending the class, but actaully just getting the functions... For instance... I'm trying to connect to a Database (database class) from my gen_XML class. Do I include the database class in the gen_XML constructor? Do I set a gen_XML variable as a database object (i.e. $this->mydb)? I hope my question makes some sense... Your help is appreciated... Mark Armendariz -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] PHP - class question
Hello, To begin.. i'm new to the list... I'm trying to learn good practices in OOP based PHP. I'm actually a bit new to OOP in general, but I've done quite a bit of reading and playing around with it in the past couple of months. What I'm trying to figure out is the proper way to call a class from a class. I dont mean by extending the class, but actaully just getting the functions... For instance... I'm trying to connect to a Database (database class) from my gen_XML class. Do I include the database class in the gen_XML constructor? Do I set a gen_XML variable as a database object (i.e. $this->mydb)? I hope my question makes some sense... Your help is appreciated... Mark Armendariz -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] class question 2
once their instantiated, they're just like any other variable - that is: if a "normal" variable, declared in the same place as the object, is accessable in another function, then the object will be too. HTH Martin -Original Message- From: Caspar Kennerdale [mailto:[EMAIL PROTECTED]] Sent: Thursday, March 28, 2002 1:17 PM To: Php-General-List (E-mail) Subject: [PHP] class question 2 Sorry Another question- Do instances of classes remain in 'communication' with each other if declared my different functions in a case switch statement. At present I have an admin.php which is one long swtich statement. Wihin each is a list iof functions which created the elements of the page Each of these functions are defined in anither file and are instances of classes. If I create an instance of a DB class for exapmle- can I refer to it thoughout the visit to the website- ie does it maintaoin its values and variables even if different functions freom the main index.php page are called sorry if this is really confusing any ideas much appreciated -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] class question 2
Objects which are instantiated from classes on one page are not available on the next page. You have to use session functionality. -Original Message- From: Caspar Kennerdale [mailto:[EMAIL PROTECTED]] Sent: Wednesday, March 27, 2002 8:17 PM To: Php-General-List (E-mail) Subject: [PHP] class question 2 Sorry Another question- Do instances of classes remain in 'communication' with each other if declared my different functions in a case switch statement. At present I have an admin.php which is one long swtich statement. Wihin each is a list iof functions which created the elements of the page Each of these functions are defined in anither file and are instances of classes. If I create an instance of a DB class for exapmle- can I refer to it thoughout the visit to the website- ie does it maintaoin its values and variables even if different functions freom the main index.php page are called sorry if this is really confusing any ideas much appreciated -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] class question 2
Sorry Another question- Do instances of classes remain in 'communication' with each other if declared my different functions in a case switch statement. At present I have an admin.php which is one long swtich statement. Wihin each is a list iof functions which created the elements of the page Each of these functions are defined in anither file and are instances of classes. If I create an instance of a DB class for exapmle- can I refer to it thoughout the visit to the website- ie does it maintaoin its values and variables even if different functions freom the main index.php page are called sorry if this is really confusing any ideas much appreciated -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Class question
Well, I guess many things are "accepted" now, but here's my two cents: I wouldn't access global variables, instead you should pass everything you need as parameters. Using global variables can come back to bite you occasionally because you may think you are changing a local variable at one point, but you actually change a global variable, and then who knows what will happen when you try to access the global variable later in your code expecting an int, for example, and it is suddenly a string... As for using other user defined functions from elsewhere in your code, I think it depends on the context... But think about what if you want to use this class elsewhere, then you will always need to copy over whatever file contains your other functions. In that case it would obviously make more sense to contain whatever functions are needed inside of the class. Hope that gives you some ideas. Jeff At 02:58 PM 2/20/2002 -0600, Chris Boget wrote: >I'm still kind of new when it comes to dealing with classes. >I'm curious, is it accepted practice for member functions of >your class to: > >* access global variables >* use non member, user defined functions > >Chris > > >-- >PHP General Mailing List (http://www.php.net/) >To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Class question
The whole idea with object-oriented programming is polymorphism and encapsulation. You do not want your classes to access global variables but access that information through objects and messaging between objects. If you are referring to the use of non-member as being outside of the class, then again you want to use objects. As for practice, it is up to you. For me, no... Ray Hunter Firmware Engineer ENTERASYS NETWORKS -Original Message- From: Chris Boget [mailto:[EMAIL PROTECTED]] Sent: Wednesday, February 20, 2002 1:58 PM To: PHP General Subject: [PHP] Class question I'm still kind of new when it comes to dealing with classes. I'm curious, is it accepted practice for member functions of your class to: * access global variables * use non member, user defined functions Chris -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Class question
I'm still kind of new when it comes to dealing with classes. I'm curious, is it accepted practice for member functions of your class to: * access global variables * use non member, user defined functions Chris -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Class Question
Hello,
This is the first time I write OOP in PHP. I wrote a small class for
Mysql and from the index.php, I am calling the new function. I have a
display before new class and I have a display after the new and only the
display I am getting is the before class and after that there is no error.
Is there any thing I should know before using the class?
I have the class in a protected directory and index.php in the main
directory.
and the class is
host = hostname;
$this->db_name = dbname;
$this->uid = uid;
$this->pwd = pwd;
$link = @mysql_db_connect($host, $uid, $pwd);
}
//*** run the query
***
function run($query)
{
$this->number_of_columns = 0;
$this->number_of_rows = 0;
$this->return_code = 0;
$this->error_info = "";
$this->result = @mysql_db_query($db_name, $query, $link);
if(!$result)
{
echo "Query didn't run";
echo @mysql_error();
$error_info = @mysql_error();
}
else
{
$number_of_columns = @mysql_num_fields($result);
$number_of_rows = @mysql_num_rows($result);
$error_info = "";
}//end of bad return code
return $return_code;
}// end of run query function
//* extract or fetch a row
**
function get_values()
{
$this->row = @mysql_fetch_object($result);
if($row)
{
extract($row);
$return_code = 0;
}
else
{
$return_code = -1;
}// end of if
}//end of get_values function
}//end of class
?>
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