PHP - Using Class Method

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

I have two classes:

## Admin.php

<?php
class Admin
{
public function __construct()
{
include("Config.php");
}

/**
* deletes a client
* @returns true or false
*/
function deleteClient($id)
{
return mysql_query("DELETE FROM usernames WHERE id = '$id'");
}
}
?>


## Projects.php

<?php
class Projects
{
public function __construct()
{
include("Config.php");
$this->admin = $admin;
$this->dataFolder = $dataFolder;
}

/**
* Deletes a project
* @returns true or false
*/
function deleteProject($id)
{
$root  = $_SERVER['DOCUMENT_ROOT'];
$theDir  = $root . $this->dataFolder;
$sql  = mysql_query("SELECT * FROM projectData WHERE proj_id = '$id'");
while ($row = mysql_fetch_array($sql))
{
$mainFile = $row['path'];
$thumb = $row['thumbnail'];
if ($thumb != 'null')
{
unlink($theDir . "/" . substr($thumb,13));
}
unlink($theDir . "/" . substr($mainFile,13));
}
$delete = mysql_query("DELETE FROM projectData WHERE proj_id = '$id'");
$getDir = mysql_query("SELECT proj_path FROM projects WHERE id = '$id'");
$res = mysql_fetch_array($getDir);
rmdir($theDir . "/" . $res['proj_path']);
return mysql_query("DELETE FROM projects WHERE id = '$id'");
}
}
?>


How can I call deleteProject() from within Admin.php?

Using this locally works fine:


$html = $name::add_content($name, $html);


but i get the double colon error whe using it live.
$name is a name of a valid class.

What could throw this error when it works locally?

Hi
I have a problem with the following:
Code: [Select]
<?php
class ClassA {
  public $propertyClassName = "ClassB";

  public function methodClassName() {
    return "ClassB";
  }
}

class ClassB {
public function bmethod() {
echo "great!";
}
}

//works
$a = new ClassA();
$b = new $a->propertyClassName();
$b->bmethod();

//doesn't work
$a = new ClassA();
$b = new $a->methodClassName();
$b->bmethod();
?>
Of course I could do
Code: [Select]
<?php
$a = new ClassA();
$className = $a->methodClassName();
$b = new $className;
$b->bmethod();
?>but isn't there a way to do this without saving the method's return to a variable?
Thanks in advance
flolam

Well in the class UserValidator I have a public method validate(), which checks the validation type and then calls specific private methods to execute the validation script. It gets a bit tricky here since the method validate() has to decide what private method to call. I am thinking about using call_user_func_array(), the script currently looks like this below:

Code: [Select]
public function validate(){
      // The core method validate, it sends requests to different private methods based on the type
      if(empty($this->type)) throw new Exception('The validation type is empty, something must be seriously wrong...');
      if(is_array($this->type) and !is_array($this->value)) throw new Exception('Cannot have scalar value if the type is an array.');
      if(!is_array($this->type) and is_array($this->value)) throw new Exception('Cannot have scalar type if the value is an array.');
     
      // Now we are validating our user data or input!
      $validarray = array("register", "login", "password", "session", "email", "reset", "profile", "contacts", "friends");
      foreach($this->type as $val){
         $method = "{$val}validate";
         if(in_array($val, $validarray)) call_user_func_array(array($this, $method), array());
      }     
  }

The method to execute depends on the validation type passed into the validator class, so it is somewhat like a dynamic function call. The problem is, well, I am not sure if I am using call_user_func_array() properly. I read it from php manual that it needs to accept a class instance, but there is no such instance inside a class method so I use $this in the argument. Is this the correct way of using call_user_func_array()? If not, how am I supposed to do this? thanks.

Hi

I have created a Database class that uses the singleton method.

I have a query method within this class so i would call this to return an array of results.

What i need to know is what would be the best way to use this returned array

Database Class:
Code: [Select]
<?php

class Database
{
private static $dbInstance;
private $hostname;
private $username;
private $password;
private $database;

private function __construct()
{
$this->hostname = 'localhost';
$this->username = 'user';
$this->password = 'pass';
$this->database = 'test';

mysql_connect($this->hostname, $this->username, $this->password);
mysql_select_db($this->database);
}

public static function getDBInstance()
{
if (!self::$dbInstance) 
     { 
         self::$dbInstance = new Database(); 
      } 

      return self::$dbInstance; 
}


public function query($q)
{
return mysql_query($q);
}


}

?>

Person Class:
Code: [Select]
<?php
require_once('Database.php');

class person
{
public function getName($id)
{
$con = Database::getDBInstance();
$query = $con->query("select name from data where id = ".$id);
$result = mysql_fetch_assoc($query);
echo $result['name'];

}


}

?>

Index page:
Code: [Select]
<?php

require_once('person.php');

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
</head>

<body>

<?php

$person = new person();
$person->getName(1);
echo "<br />";
$person->getName(2);


?>

</body>
</html>

Can I not pass references into class properities from outside the object? 

class db_manipulation { 

private $connection = NULL;

function __construct(&$database_connection) {
$this->connection = $database_connection;
if (!$this->connection) die('couldnt connection to database');
}

function __destruct() {
mysqli_close($this->connection);
}
}

Results in: Warning: mysqli_close() [function.mysqli-close]: Couldn't fetch mysqli in

I have these two classes:
Code: [Select]
<?php
class A {
private $id;
public function __construct() {
$this->id = '11111';
}
public function getProperty($prop) {
return $this->$prop;
}
}?>
Code: [Select]
<?php
class B extends A {
private $message = "Nope, can't see it";
public function __construct() {
parent::__construct();
$this->message = "Yep, I can see it";
}
}?>
I tried this, but it just outputs the id (the first call)
Code: [Select]
$class = new B;
echo $class->getProperty('id');
echo $class->getProperty('message');
Why is that? I thought I could use a parent method on a child property..


*EDIT* Using a public or protected visibility on the message property gets me the output I expect...how come?

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?

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.

I have a class in which I have a function called connection. I am now trying to call this function from another class, but it will not work. It works if I put the code in from the other function rather than calling it but that defeats the purpous.

class locationbox

{
   function location()
   {
   
   
   $databaseconnect = new databaseconnect();
         $databaseconnect -> connection();{

$result = mysql_query("SELECT * FROM locations");

while($row = mysql_fetch_array($result)) // line that now gets the error, mysql_fetch_array() expects parameter 1 to be resource, boolean given //in
  {
  echo "<option>" . $row['location'] . "</option>";
    }
   
}
}}

I do know how to do this but I am curious about whether or not there is a "preferred" way to do this. I know there are a couple ways to use a class (I'll call Alpha_Class) within another class (I'll class Beta_Class)

Let's say we have this simple class (Beta_Class):

class beta {
    function foo(){
    
    }
}


If I wanted to use the Alpha Class within the Beta Class, I could any number of things. For example:

class beta {
    function foo(){
        $this->alpha = new alpha;
        //$this->alpha->bar();
    }
}


Or you could simply use the $GLOBALS array to store instantiated objects in:

$GLOBALS['alpha'] = new alpha;
class beta {
    function foo(){
        //GLOBALS['alpha']->bar();
    }
}


You could even declare Alpha_Class as a static class and thus would not need to be instantiated:

static class alpha {
    static function bar(){}
}

class beta {
    function foo(){
        //alpha::bar();
    }
}


Those are the only ways I can think of right now. Are there any other ways to accomplish this? I was wondering which way is the best in terms of readability and maintainability.

How does one go about using one class inside another?

For example, building a class that does some series of functions, and uses a db abstraction layer class in the process?

Hi all,

I have two classes. Registration and Connection.

Inside a registration.php I include my header.php, which then includes my connection.php...

So all the classes should be declared when the page is loaded.

This is my code:


registration.php:

<?php include ('assets/header.php'); ?> 
        
    <?php
        class registration{                    
            public $fields = array("username", "email", "password");
            public $data = array();
            public $table = "users";
            public $dateTime = "";
            public $datePos = 0;
            public $dateEntryName = "date";
            
            function timeStamp(){
                return($this->dateTime = date("Y-m-d H:i:s"));
            }
            
            function insertRow($data, $table){      
                    
                    foreach($this->fields as $key => $value){
                        mysql_query("INSERT INTO graphs ($this->fields)
                        VALUES ('$data[$key]')");
                    }
                    
                    mysql_close($connection->connect);
            }
            
            function validateFields(){
            
                $connection = new connection(); 
                $connection->connect();
                        
                foreach($this->fields as $key => $value){
                    array_push($this->data, $_POST[$this->fields[$key]]);
                }
                $this->dateTime = $this->timeStamp();
                array_unshift($this->data, $this->dateTime);                
                array_unshift($this->fields, $this->dateEntryName);   
                
                foreach($this->data as $value){
                    echo "$value";
                }
                
                $this->insertRow($this->data, $this->table);
            }
        }
        
        $registration = new registration();
        $registration->validateFields();
    ?>

<?php include ('assets/footer.php'); ?>



At this point I cannot find my connection class defined on another included/included page.



                $connection = new connection(); 
                $connection->connect;





config.php (included within header.php)

<?
    class connection{ 
        public $dbname = '**';   
        public $dbHost = '**';
        public $dbUser = '**';
        public $dbPass = '**';
        public $connect;
        
        function connect(){
            $this->connect = mysql_connect($this->dbHost, $this->dbUser, $this->dbPass) or die ('Error connecting to mysql');
            mysql_select_db($this->dbname, $this->connect);
        }
    }
?>



Any ideas how to call it properly?

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?