Static Attributes

[MichaelD]

Just read a book on OOPHP and started playing around with PHP's OOP.
Most of it's working just fine, but I cant seem to figure out how to
access static attributes - here's my code:

class testing implements Iterator
{
protected static $connection = false;
...

public static function setConnection($ connection)
{
if(!testing::co nnection)
$this->connection = $connection;
}

public function __construct($qu ery)
{
if(!testing::co nnection)
echo 'Connection not set.';
}
...
}

So here's my problem(s): first off, I get a Fatal error: Undefined
class constant 'connection' at the line 'if(!testing::c onnection)' in
the constructor. Using $this->connection doesn't work (and it
wouldn't really make sense if it did) using self::connectio n causes
the same error as testing::connec tion (which also makes sense) but I
cant figure out how to refrence the attribute.

That said, see the static function above? That gets by another class
called before the constructor, and it works fine. Previously I used
testing::connec tion = $connection; but that threw an error and told me
to use $this-which doesn't make any sense at all, since there isn't
a $this object to refrence.

Can someone please explain both what I'm doing wrong and how to
properly work with static attributes?

[Toby A Inkster]

Re: Static Attributes

MichaelD wrote:

class testing implements Iterator
{
protected static $connection = false;
...
>
public static function setConnection($ connection)
{
if(!testing::co nnection)
$this->connection = $connection;
}
>
public function __construct($qu ery)
{
if(!testing::co nnection)
echo 'Connection not set.';
}
...
}

class testing implements Iterator
{
protected static $connection = false;
...

public static function setConnection($ connection)
{
if(!self::$conn ection)
self::$connecti on = $connection;
}

public function __construct($qu ery)
{
if(!self::$conn ection)
echo 'Connection not set.';
}
...
}

--
Toby A Inkster BSc (Hons) ARCS
[Geek of HTML/SQL/Perl/PHP/Python/Apache/Linux]
[OS: Linux 2.6.12-12mdksmp, up 22 days, 15:48.]

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[Darko]

Re: Static Attributes

On Jul 13, 12:14 pm, MichaelD <dimo...@gmail. comwrote:

Just read a book on OOPHP and started playing around with PHP's OOP.
Most of it's working just fine, but I cant seem to figure out how to
access static attributes - here's my code:
>
class testing implements Iterator
{
protected static $connection = false;
...
>
public static function setConnection($ connection)
{
if(!testing::co nnection)
$this->connection = $connection;
}
>
public function __construct($qu ery)
{
if(!testing::co nnection)
echo 'Connection not set.';
}
...
>
}
>
So here's my problem(s): first off, I get a Fatal error: Undefined
class constant 'connection' at the line 'if(!testing::c onnection)' in
the constructor. Using $this->connection doesn't work (and it
wouldn't really make sense if it did) using self::connectio n causes
the same error as testing::connec tion (which also makes sense) but I
cant figure out how to refrence the attribute.
>
That said, see the static function above? That gets by another class
called before the constructor, and it works fine. Previously I used
testing::connec tion = $connection; but that threw an error and told me
to use $this-which doesn't make any sense at all, since there isn't
a $this object to refrence.
>
Can someone please explain both what I'm doing wrong and how to
properly work with static attributes?

If you use the attribute without the string sign ($) you get constants
declared in the class. Same as with ordinary variables.