PHP - Way Of Accessing Static Variables Inside Class With Expression Returns?

Can somebody help me what i'm  doing wrong? The value from database is not visible when using:
<?php
$artikel = new Artikel();
$content= $artikel->printArtikel();
echo $content;
?>


<?php
class Artikel {
                // db connection
protected $mydb; 

                // database value
protected $land;

public function __construct($artikelnummer = false)
{  // databaseconnection:
$this->mydb = new MyDB();

if($artikelnummer)
{
$this->load($artikelnummer); 
}
else // load everything from database.
{
$sql = "SELECT * FROM artikel";
$this->mydb->doQuery($sql);
$this->mydb->close();
}
}

public function load($artikelnummer)
{
$sql = "SELECT * FROM artikel";
$this->mydb->doQuery($sql);

if($artikel = $this->mydb->fetch())
{
    // i got a feeling there is something missing here, like query from database??
                }
$this->mydb->close();
}

public function printArtikel()
{
// return database value as table.
$html = "<table border='1'>";
$html .= "<tr>
<td>".$this->land."</td> 
                </tr>";
$html .= "</table>";
return $html;
}
}
?>


Other class are accessing extern. For example database connection with class MyDB.
please, can somebody correct my script??

I have 2 php files. I am unable to get B's global variable from A's static method:

A.php
Code: [Select]
class c_A
  { public static function f_A()
      { include_once( "B.php" ) ;
        print f_B() ;
      }
  }
c_A::f_A( ); // only prints "B : "

B.php
Code: [Select]
$gvs = "global variable from B" ;

function f_B()
  { return "B : " . $GLOBALS[ "gvs" ] ;
  }


any thoughts?


thanks,
Shannon

I have the following simple class:

Code: [Select]
class Settings {
  public static $mysql_datetime_format = "%c/%e/%Y %l:%i %p " . date("[T]");
}

And referencing like:

Code: [Select]
echo Settings::$mysql_datetime_format;

But, I am getting the error: Parse error: syntax error, unexpected '.', expecting ',' or ';'.

Why is this invalid?

Hello, my first post here.

I created a Validation class that depends entirely on static methods. It appears to be working well, but perhaps I misunderstood exactly the purpose and the consequences of using static methods.

My class essentially looks like this:


class Validate
{
static public $errors  = array();
static public $valid   = array();

static public function Name($name)
{
if ($name != '')
{
self::$valid['name'] = $name;
return true;
}
                                else
                                {
                self::$errors['name'] = 'Name is empty';
                return false;
                                 }
}
}


Does this create any chance whatsoever for a collision of data from multiple users? I am beginning to think it does, simply because from what I have recently learned about static methods, theyr'e essentially global variables because they are not instantiated. If that's the case, then it would seem possible that during times of heavy use, any application depending on this class would confuse submitted data.

Any thoughts?

Thanks in advance.

Is there any way to access a variable that is not assigned until further down the page eg:

echo $myname;

$myname = 'batman'; // clearly my real name which is why I am so poor at coding

Thanks 

I have an existing instance of my class Database, now I want to call that instance in my Session class, how would I go about doing this?

Ok. I know you can pass the object of a class as an argument. Example:


class A {
    function test() {
        echo "This is TEST from class A";
    }
}


class B {
    function __construct( $obj ) {
        $this->a = $obj;
    }

    function test() {
       $this->a->test();
    }

}


Then you could do:

$a = new A();
$b = new B($a);


Ok so that's one way i know of.

I also thought that you could make a method static, and do this: (assuming class A's test is 'static')

class B {
    function test() {
       A::test(); 
   }
}


But that is not working.


I'd like to know all possible ways of accomplishing this. Any hints are appreciated. thanks

Hey guys,   I'm using the following pagination script from a website I found. I'ts basically a pagination script that takes data from a MySQL database and displays a certain number of sets before placing the next set on a new page.   This script works great if I substitute a static value for the data I want returned but If the request is stored in a $POST variable like from an HTML form the data refuses to paginate. It will render the first set of data but will not paginate the rest and only shows blank pages   I'm thinking it has something to do with the $POST variable not being set or carrying over to each page but I'm not sure.   I truly appreciate the help!

<?php
	/*
		Place code to connect to your DB here.
	*/
	include('config.php');	// include your code to connect to DB.

	$tbl_name="";		//your table name
	// How many adjacent pages should be shown on each side?
	$adjacents = 3;
	
	/* 
	   First get total number of rows in data table. 
	   If you have a WHERE clause in your query, make sure you mirror it here.
	*/
	$query = "SELECT COUNT(*) as num FROM $tbl_name";
	$total_pages = mysql_fetch_array(mysql_query($query));
	$total_pages = $total_pages[num];
	
	/* Setup vars for query. */
	$targetpage = "filename.php"; 	//your file name  (the name of this file)
	$limit = 2; 								//how many items to show per page
	$page = $_GET['page'];
	if($page) 
		$start = ($page - 1) * $limit; 			//first item to display on this page
	else
		$start = 0;								//if no page var is given, set start to 0
	
	/* Get data. */
	$sql = "SELECT column_name FROM $tbl_name LIMIT $start, $limit";
	$result = mysql_query($sql);
	
	/* Setup page vars for display. */
	if ($page == 0) $page = 1;					//if no page var is given, default to 1.
	$prev = $page - 1;							//previous page is page - 1
	$next = $page + 1;							//next page is page + 1
	$lastpage = ceil($total_pages/$limit);		//lastpage is = total pages / items per page, rounded up.
	$lpm1 = $lastpage - 1;						//last page minus 1
	
	/* 
		Now we apply our rules and draw the pagination object. 
		We're actually saving the code to a variable in case we want to draw it more than once.
	*/
	$pagination = "";
	if($lastpage > 1)
	{	
		$pagination .= "<div class=\"pagination\">";
		//previous button
		if ($page > 1) 
			$pagination.= "<a href=\"$targetpage?page=$prev\">� previous</a>";
		else
			$pagination.= "<span class=\"disabled\">� previous</span>";	
		
		//pages	
		if ($lastpage < 7 + ($adjacents * 2))	//not enough pages to bother breaking it up
		{	
			for ($counter = 1; $counter <= $lastpage; $counter++)
			{
				if ($counter == $page)
					$pagination.= "<span class=\"current\">$counter</span>";
				else
					$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
			}
		}
		elseif($lastpage > 5 + ($adjacents * 2))	//enough pages to hide some
		{
			//close to beginning; only hide later pages
			if($page < 1 + ($adjacents * 2))		
			{
				for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
				{
					if ($counter == $page)
						$pagination.= "<span class=\"current\">$counter</span>";
					else
						$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
				}
				$pagination.= "...";
				$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
				$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";		
			}
			//in middle; hide some front and some back
			elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
			{
				$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
				$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
				$pagination.= "...";
				for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
				{
					if ($counter == $page)
						$pagination.= "<span class=\"current\">$counter</span>";
					else
						$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
				}
				$pagination.= "...";
				$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
				$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";		
			}
			//close to end; only hide early pages
			else
			{
				$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
				$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
				$pagination.= "...";
				for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
				{
					if ($counter == $page)
						$pagination.= "<span class=\"current\">$counter</span>";
					else
						$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";					
				}
			}
		}
		
		//next button
		if ($page < $counter - 1) 
			$pagination.= "<a href=\"$targetpage?page=$next\">next �</a>";
		else
			$pagination.= "<span class=\"disabled\">next �</span>";
		$pagination.= "</div>\n";		
	}
?>

	<?php
		while($row = mysql_fetch_array($result))
		{
	
		// Your while loop here
	
		}
	?>

<?=$pagination?>
	

Was just wondering why some people choose NOT to make use of static functions when initializing objects via Factory Classes/Containers.

What are the benefits of initializing the Factory class when for all intensive purposes, it's only used to initialize new classes, etc? 
Does this have any impact on Dependency Injection?  I'm assuming that it doesn't since that would defeat the purpose.

---------

Also, I've noticed that there seems to be an intense stigma within the development community in regard to singletons. 
Are singletons necessarily a bad thing? 

What about database objects? 

One argument I've heard is that this can often impact the flexibility of your application in the event that a new instance of said class needs to be initialized(a second completely separate connection).

However, I was thinking that you could simply store these objects within a static member variable in the factory class; leaving the Database Class' __construct public in the event that you need to create that second/third/fourth connection.

Wouldn't this resolve the issue? 

I have a file, test.php. It has a require statement to include line.php. Now on normal load, I can access the variables set in test.php in line.php.

However, I also have an automated reload of line.php using AJAX, where I send a request to access the file and it outputs the same information. HOWEVER, in this case, the variables set in test.php can no longer be access :s .. why is that?

I haven't set any data to be passed in the request, but I assume this doesn't have to be done.

Well the title may seem a bit confusing, but heres an example:

Code: [Select]
<?php
class User{
   public $uid;
   public $username;
   protected $password;
   protected $email;
   public $usergroup;
   public $profile;
   

  public function __construct($id){
      // constructor code inside
  }

  public function getemail(){
      return $this->email;
  } 
   
  public function getusergroup(){
      return $this->usergroup;
  }

  public function getprofile(){
      $this->profile = new UserProfile($this->uid);
  }
}

class UserProfile(){
   protected $avatar;
   protected $bio;
   protected $gender;
   protected $favcolor;
   

  public function __construct($id){
      // constructor code inside
  }

  public function formatavatar(){
      // avatar formatting code inside
  }

  public function formatusername(){
      // format username?
  } 
}
?>

As you can see, the User class(an outer class) has a property called Profile, which can be instantiated as a UserProfile object(an inner class). The two objects have distinct functionalities, but there are times when the UserProfile object needs to access property and methods from the user object. I know its easy for outer class to access methods from inner class by using the single arrow access operator twice, but how about the other way around?

Lets say from the above example the userprofile can format the username displayed to the screen by adding a sun to the left of the username if the usergroup is admin, a moon if the usergroup is mod, and nothing if its just a member. The usergroup property is stored in the outer class, and can be accessed with this $user->getusergroup() method only. I know I can always do the hard way by passing a user object to the method's argument, but is there an easier way for the inner class UserProfile to access properties/methods for outerclass User? If so, how can I achieve that?

Hi,

I need to be able to call a class based on variables.  E.G.

I would normally do:
Code: [Select]
$action = new pattern1()
but i would like to be able to do it dynamicaly:
Code: [Select]
$patNum = 1;
$action = new pattern.$patNum.()
Im wondering if that's possible?  If so what would the correct syntax be?

Many Thanks.

In my code I call PEAR::isError to see if there was an error in the SQL Query so I can log it but its always returning this error. Does anyone know a fix? I have tried to search google it and found http://pear.php.net/bugs/bug.php?id=9950 but it does not say how to fix it. Does anyone have any ideas?

Error
Non-static method PEAR::isError() should not be called statically

$query = "SELECT
Column
            FROM
             TableName";
$res = $db['database']->query($query);
if (PEAR::isError($res)) {
  $logger->err("Error pulling results from DB. Query:" . $query);
}

Hi people!

class FirstOne{

public function FunctionOne($FirstInput){
//do stuff and output value
return $value1;
}

}


Then:-


class SecondOne{

public function FunctionTwo($AnotherInput){
//do stuff and output value
return $value2;
}

}


What I want to know is this, if I want to use FunctionOne() in Class SecondOne do I do it like this:-

(Assume as I have instantiated the first class using $Test = new FirstOne(); )


class SecondOne{

function SecondedFunction(){
global $Test;
return $Test->FunctionOne();
}

public function FunctionTwo($AnotherInput){
//do stuff and output value
return $value2;
}

public function FunctionThree(){

//some code here
$this->Test->SecondedFunction();<--I think as I can omit the $this-> reference
}
}


My point is: Do I have to do it this way or is there way of having this done through __construct() that would negate the need for a third party function?

I have a version working, I just think that it is a little convoluted in the way as I have done it, so I thought I would ask you guys.

Any help/advice is appreciated.

Cheers
Rw

Hello all, I have some piece of code that is nested like this


$variable = 'This is a global argument';
function parentFunction($variable) {
function childFunction() {
echo 'Argument of the parent function is '.$GLOBALS['variable'];
}
childFunction();
}
parentFunction(5);


What I want to know is - Is there a way to access a variable from the parent function without passing arguments to the child function? (Something like how classes have parent::?). I don't want to use $GLOBALS because it might cause some variable collision, and I didn't want to pass arguments because incase I decide to change the arguments in the parent function I'd have to do it in the child function aswell. From my searching around in the Internet it seems like this is not possible, but if theres a slight chance that there might be something out there, i'm willing to give it a shot .

Thanks in advance