PHP - Oo Extends With A Constructor

I was wondering if there was a class that I could extend that extends the main class in php. For example all of the classes that I am creating will extend the core class or will be extending a class that extends from the core class. However if the class doesnt exist then it will throw an error. What I would like to do is be able to handle this error instead of just throwing the error so I was hoping that there was a class that I could extend the core class from to handle these errors. This way I can use the magic method __get() to handle the error. If there is another way to go about this please let me know so that I can look into that solution.

This code works without problems:

<?php
namespace NamespaceA;
class A extends \NamespaceB\B {}

namespace NamespaceB;
class B {}

But why the following code cause Fatal error: Class 'NamespaceB\B' not found in ...file?
 

<?php
namespace NamespaceA;
class A extends \NamespaceB\B {}

namespace NamespaceB;
class B extends \NamespaceC\C {}

namespace NamespaceC;
class C {}

And this code also works without problems:

<?php
namespace NamespaceA;
class A extends \NamespaceB\B {}

namespace NamespaceC;
class C {}

namespace NamespaceB;
class B extends \NamespaceC\C {}

Without any namespace, also Fatal error: Class 'B' not found in ...file:
 

<?php

class A extends B {}

class B extends C {}

class C {}

Works without problems:

<?php

class A extends B {}

class B {}

And yes everything is in the same PHP file....

hi phpfreaks

I have an class that is called "connDatabase" what I want to do with it is either extend it or implement it.
But I don't know which one to use. The other issue I have is say class "a" has three vars that the that the construct
needs to obstantiate and "connDatabase" needs three of its own. How do I obstantiate?

thanks for any help

Hello all,

I have been trying to create a new constructor function using OOP PHP that will automatically encrypt passwords before they are sent to the database.  However, I am not sure if my understanding of constructors is wrong if I am just not doing it right.  As I understand it a constructor function will allow you to perform an operation on an object before the object is used.  I have included some snippets of my code and would appreciate any insight on this matter:

Code from the User object is below:

     function __construct($encrypt_pass) {
          $this->password = $encrypt_pass;
}
     public function new_user() {
          $create_new_user = new User();
          if(isset($create_new_user->id)) {
            $create_new_user->update();
          } else {
          return false;
    }
  }
     public static function authenticate($username="", $password="") {
          global $db;
          $username = $db->escape_value($username);
          $password = $db->escape_value($password);

          $sql  = "SELECT * FROM users ";
          $sql .= "WHERE username = '{$username}' ";
          $sql .= "AND password = '{$password}' ";
          $sql .= "LIMIT 1";
          $result_array = self::find_by_sql($sql);
          return !empty($result_array) ? array_shift($result_array) : false;
}

The following code is from the administrative script to create a new user:

<?php
if(isset($_POST['submit'])) {
  $create_new_user = new User();
  $create_new_user->username = trim($_POST['username']);
  $create_new_user->password = trim($_POST['password']);
  $create_new_user->first_name = trim($_POST['first_name']);
  $create_new_user->last_name = trim($_POST['last_name']);
  $create_new_user->email = trim($_POST['email']);

  if($create_new_user && $create_new_user->create()) {
    $session->message("echo $username has been successfully added as a new us$
    redirect_to("index.php");
} else {
  $message = "There was an error while creating the new user.  Please contact$
}
} else {
  $username ="";
  $password ="";
  $first_name="";
  $last_name="";
  $email="";
}
?>

The following snippet is from the login page:

if (isset($_POST['submit'])) {
  $username = trim($_POST['username']);
  $password = trim($_POST['password']);

  $found_user = User::authenticate($username, $password);

if ($found_user) {
  $session->login($found_user);
  log_action('Login', "{$found_user->username} logged in.");
  redirect_to("index.php");
    } else {
    $message = "Username/password combination incorrect.";
  }
} else {
  $username = "";
  $password = "";
}
?>

Since I am using the sha algorithm built into PHP I figured it would be best to build it into the object so it would occur automatically. 

class 1:
 class HelloWorld { public $world; function getHtml() { return "<html><body>". "Hello, ".$this->world."!". "</body></html>"; } }

class2:
class HelloWorld {
public $world;
function __construct($world) {
$this->world = $world;
}
function getHtml() {
return "<html><body>".
"Hello ".$this->world."!".
"</body></html>";
}
}

i don't know why in class 2 it uses a construct function. i feel it is unnecessary .any tips would be appreciated.