PHP - Class Advantages

If a class has a constructor but also has a static method, if I call the static method does the constructor run so that I can use an output from the constructor in my static method?

--Kenoli

Hi

Can you call Class A's methods or properties from Class B's methods?

Thanks.

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 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?

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

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?

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.

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>";
    }
   
}
}}

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?

I need to add a class to the div at the end of my for each.  How do I say if the function breaks, add in class="lastmessage"


<?php

$counter = 0;

foreach ($conversations as $conversation)

{

if(++$counter == 5) break;

?>

<div class="(add class here)">

<a href="blah"><?php echo blah; ?></a>

</div>
                <?php
         }
?>

im trying to learn more on OOP so decided to try this code:


class asf
{
    public $_template;
    
    public function __construct()
    {
        $this->_template = new newTemplate;
    }
}

class newTemplate
{    
    public function setTemplate($template)
    {
        global $asf;
        $asf->_template = $template;
    }
    
    public function getTemplate()
    {
        global $asf;
        return $asf->_template;
    }
}

$asf = new asf;

$asf->_template->setTemplate('default');

echo $asf->_template->getTemplate();


setTemplate() works but i get the following error on getTemplate():

Code: [Select]
Call to a member function getTemplate() on a non-object
can anyone explain why and let me know how to fix it? Thanks.

I am building a classified ads module for a CMS I use and want to use a class to 'build' each ad before it is displayed on the browser.  What I have is something like this.
Code: [Select]
<?php
class classifedAds {
var $id;
//set method
function setData($data) {
$this->id=$data;
}
//ad method
function getAd()
if(isset($this-id)) {
$sql = "SELECT * FROM ads WHERE ad_id =".$this->id;
}
else {
$sql = "SELECT * FROM ads";
}
$query = mysql_query($sql);
while($data = mysqk_fetch_array($query, MYSQL_ASSOC)) {
//get ad images
$images = self::getImages($data['ad_id']);
//get ad category name
$category = self::getCategory($data[cat_id]);
$ad = array(
'title'=> $data['title'],
'desc'=> $data['desc'],
'price'=> $data['price'],
'image'=> $images['image'],
'category'->$category['category_name']
);

return $ad;
}//end getAd
//get images method
function getImages($ad_id) {
$sql = "SELECT image FROM images WHERE ad_id=$ad_id";
$query = mysqL_query;
$images = mysql_fetch_arry($query, MYSQL_ASSOC);
return $images;
//get categories method
function getImages($ad_id) {
$sql = "SELECT category FROM categories WHERE cat_id=$cat_id";
$query = mysqL_query;
$category = mysql_fetch_arry($query, MYSQL_ASSOC);
return $category;
}
}//end class
?>

This works ok if i set an ad id first like this....

Code: [Select]
<?php
$class = new classifedAds;
$class -> setData($some_ad_id_number);
$ad = $class->getAd();
?>

But because I need to display a list of ads same on the main page I would like to just do this...

Code: [Select]
<?php
$class = new classifedAds;
$ad = $class->getAd();
?>

Which does not work at all.  I'll post a screen shot later when I get home and run it.  Hopefully someone here can point me in the right direction.  The other Issue I seem to have is being able to loop through ads images.  So assuming that the getAd() method works fine I try this to get the images to display.

Code: [Select]
<?php
foreach($ad['image'] as $img) {
echo '<img scr="/path_to_images/'.$img.'"/>';
}
?>

This outputs something like this...

Code: [Select]
<img scr="/path_ti_images/(some random letter)"/>

for each of the images in the $ad['image'] array.

Any help on either of these issues is greatly appreciated.

Here it is, comments please guys! THnkas

<?php
class buddyList
{
// PenpalA = current logged in member; 
// PenpalB = member to add to list; 
// name = name of member to add to list
var $buddyList; //an array of buddies
var $buddies; //an amount
var $loggedUserID;

function __construct(){
$this->loggedUserID = $_ENV['loggedMemberID'];
}

function add($penpalB)
{
//check if row already exists
$sql = "SELECT id FROM buddy WHERE `PenpalA` = '$this->loggedUserID' AND `PenpalB` = '$penpalB' AND `status` = 1"; 
$mysql = new mysql(); $mysql->query($sql);
if( mysql_num_rows( $mysql->result ) < 1 ){ //if row doesnt exist add new row
$sql = "INSERT INTO  `buddy` (`penpalA` ,`PenpalB`) VALUES ('$this->loggedUserID','$penpalB');";
$mysql = new mysql(); $mysql->query($sql);
$tempMember = new member($penpalB);
//display success message
echo '<span  class="pint2"><strong>'.PROFILEadded_buddy_before.$tempMember->name.'</strong> '.PROFILEadded_buddy_after.' <a style="color:#ffffff" href="http://localhost/penpalparade/buddy'.( in_array($lang,$_ENV['supportedLanguages']) ? "/".$lang : $nothing).'">'.PROFILEsee_buddy_list.'</a> </span>';
}
}

function remove($penpalB)
{
$sql = "UPDATE buddy SET `status` = 0 WHERE `PenpalA` = '$this->loggedUserID' AND `PenpalB` = '$penpalB'";
$mysql = new mysql(); $mysql->query($sql);

$tempMember = new member($penpalB);

// display success message
echo '<span  class="pint2"><strong>'.PROFILEremoved_buddy_before.$tempMember->name.'</strong> '.PROFILEremoved_buddy_after.' <a style="color:#ffffff" href="http://localhost/penpalparade/buddy'.( in_array($lang,$_ENV['supportedLanguages']) ? "/".$lang : $nothing).'">'.PROFILEsee_buddy_list.'</a></span>';
}

function build()
{
$this->buddyList = array();
$sql = "SELECT `PenpalB` FROM buddy WHERE `PenpalA` = '$this->loggedUserID' AND `status` = 1";
$mysql = new mysql(); $mysql->query($sql); 
$i = 0;
while($row = mysql_fetch_array($mysql->result)){
$this->buddyList[$i] = $row['PenpalB'];
$i++;
}
$this->buddies = $i;
}

function display()
{
//build table
echo '<table border="1" width="100%">';
echo '<tr><td align="center"><strong>'.MISCbuddy_name.'</strong></td>';
echo '<td align="center"><strong>'.MISCbuddy_last_online.'</strong></td>';
echo '<td></td><td></td></tr>';

//display buddies
for ( $counter = 0; $counter <= $this->buddies-1; $counter += 1) {

$tempMember = new member($this->buddyList[$counter]);
echo '<tr>'; //start row
echo '<td align="center">';
echo '<a href='.(in_array($lang,$_ENV['supportedLanguages']) ? $lang."/" : $nothing).HEADlanguage_exchange.'/id/'.$tempMember->id.'">'.$tempMember->name.'<br />';
$tempMember->displayPhoto(82);
echo '</td>';
echo '<td align="center">'.MISCbuddy_ago_before.time_since($tempMember->lastOnline).MISCbuddy_ago_after.'</td>';
echo '<td align="center"><a href="http://localhost/penpalparade/email.php?id='.$tempMember->id.'&email=yes'.(in_array($lang,$_ENV['supportedLanguages']) ? '&lang='.$lang : $nothing).'">'.MISCbuddy_message.'</a></td>';
echo '<td align="center">';
?>
<form action="javascript:void(0);" method="post" onsubmit="if( confirm('<?=MISCbuddy_remove_confirm?>') ){ document.getElementById('removePenpal<?=$tempMember->id?>').innerHTML='<?=MISCbuddy_remove_change?>';document.getElementById('ajax-loader<?=$tempMember->id?>').style.display = 'block';window.location = 'buddy.php?remove=<?=$tempMember->id?><?=(in_array($lang,$_ENV['supportedLanguages']) ? '&lang='.$lang : $nothing)?>' }else{ }">
<div style="display:inline;" id="removePenpal<?=$tempMember->id?>"><input type="submit" value="<?=MISCbuddy_remove?>" /></div>
<div style="display:none;" id="ajax-loader<?=$tempMember->id?>"><img class="ajaxLoader" src="mages/ajax-loader.gif" alt="removing..."/></div>
</form></td>
<?php
echo '</tr>'; //end row

}

echo '</table>';
}
}
?>

Hi
I am trying to set this simple bit of code up in a class:
Code: [Select]
$lastID_sql = "SELECT max(id) FROM admin_interest";
$lastID_query = mysql_query($lastID_sql) or die ('Line 6: '.mysql_error());
$lastID_Row = mysql_fetch_array($lastID_query);
$lastID = $lastID_Row['max(id)'];

As you can see, you need to return the max(id) to be able to display that value that you want.


My Class:
Code: [Select]
class Admin_interest {

protected static $table_name="admin_interest";
protected static $db_fields = array('id', 'interest_category', 'type');
public $id;
public $interest_category;
public $type;

public static function find_by_maxID(){
global $database;
$sql = "SELECT max(id) FROM ".self::$table_name." LIMIT 1";
$result_array = self::find_by_sql($sql);
return !empty($result_array) ? array_shift($result_array) : false;
}

Displaying the class
Code: [Select]
$found_lastID = Admin_interest::find_by_maxID();
echo $found_lastID->id . '<br>';


The value, as expected is blank.
I've tried $found_lastID->max(id)
But this comes back with an error


Any ideas?

Thanks