PHP OOPS - Polymorphism

What is Polymorphism?
Polymorphism in PHP5 is a technique where the function to be called is detected based on the class object calling it at runtime. The basis of Polymorphism is Inheritance and function overridden.


Example – Basic Polymorphism


class BaseClass
{
public function myMethod()
{
echo "BaseClass method called";
}
}

class DerivedClass extends BaseClass
{
public function myMethod()
{
echo "DerivedClass method called";
}
}

function processClass(BaseClass $c)
{
$c->myMethod();
}

$c = new DerivedClass();
processClass($c);

Output:
DerivedClass method called

Here i am declaring BaseClass and DerivedClass but i am calling the the processClass with the Derived Class Object.

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Jooma Events

The events triggered in Joomla! are:

These are the related methods trigged when a particular event occurs

Authentication

* onAuthenticate

Content

* onPrepareContent
* onAfterDisplayTitle
* onBeforeDisplayContent
* onBeforeContentSave (new in 1.5.4)
* onAfterContentSave (new in 1.5.4)

Editors

* onInit
* onGetContent
* onSetContent
* onSave
* onDisplay
* onGetInsertMethod

Editors XTD (Extended)

* onDisplay

Seach

* onSearch
* onSearchAreas

System

* onAfterInitialise
* onAfterRoute
* onAfterDispatch
* onAfterRender

User

* onLoginUser
* onLoginFailure
* onLogoutUser
* onLogoutFailure
* onBeforeStoreUser
* onAfterStoreUser
* onBeforeDeleteUser
* onAfterDeleteUser

XML-RPC

* onGetWebServices

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What is DTD? Types of DTD?

The doctype declaration should be the very first thing in an HTML document, before the html tag.

The doctype declaration is not an HTML tag; it is an instruction to the web browser about what version of the markup language the page is written in.

The doctype declaration refers to a Document Type Definition (DTD). The DTD specifies the rules for the markup language, so that the browsers can render the content correctly.

Doctypes Available in the W3C Recommendations
HTML 4.01 Strict

This DTD contains all HTML elements and attributes, but does NOT INCLUDE presentational or deprecated elements (like font). Framesets are not allowed.

HTML 4.01 Transitional

This DTD contains all HTML elements and attributes, INCLUDING presentational and deprecated elements (like font). Framesets are not allowed.

HTML 4.01 Frameset

This DTD is equal to HTML 4.01 Transitional, but allows the use of frameset content.

XHTML 1.0 Strict

This DTD contains all HTML elements and attributes, but does NOT INCLUDE presentational or deprecated elements (like font). Framesets are not allowed. The markup must also be written as well-formed XML.

XHTML 1.0 Transitional

This DTD contains all HTML elements and attributes, INCLUDING presentational and deprecated elements (like font). Framesets are not allowed. The markup must also be written as well-formed XML.

XHTML 1.0 Frameset

This DTD is equal to XHTML 1.0 Transitional, but allows the use of frameset content.

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What is Http? Types of Headers in HTTP

The Hypertext Transfer Protocol (HTTP) is an Application Layer protocol for distributed, collaborative, hypermedia information systems.

HTTP is a request-response standard typical of client-server computing. In HTTP, web browsers or spiders typically act as clients, while an application running on the computer hosting the web site acts as a server. The client, which submits HTTP requests, is also referred to as the user agent. The responding server, which stores or creates resources such as HTML files and images, may be called the origin server. In between the user agent and origin server may be several intermediaries, such as proxies, gateways, and tunnels.

HTTP is not constrained in principle to using TCP/IP, although this is its most popular implementation platform. Indeed HTTP can be "implemented on top of any other protocol on the Internet, or on other networks." HTTP only presumes a reliable transport; any protocol that provides such guarantees can be used.

Resources to be accessed by HTTP are identified using Uniform Resource Identifiers (URIs)—or, more specifically, Uniform Resource Locators (URLs)—using the http or https URI schemes.

Requests Headers:
These are the following request headers:
Accept Content-Types that are acceptable
Accept-Charset Character sets that are acceptable
Accept-Encoding Acceptable encodings
Accept-Language Acceptable languages for response
Cache-Control Used to specify directives that MUST be obeyed by all caching
mechanisms along the request/response chain
Content-Type The mime type of the body of the request (used with POST and PUT
requests)
Host The domain name of the server (for virtual hosting), mandatory since
HTTP/1.1
Pragma Implementation-specific headers that may have various effects
anywhere along the request-response chain.

Responses
These are the response headers

Accept Content-Types that are acceptable
Accept-Charset Character sets that are acceptable
Accept-Encoding Acceptable encodings
Accept-Language Acceptable languages for response
Cache-Control Used to specify directives that MUST be obeyed by all caching
mechanisms along the request/response chain
Content-Type The mime type of the body of the request (used with POST and PUT
requests)
Host The domain name of the server (for virtual hosting), mandatory since
HTTP/1.1
Pragma Implementation-specific headers that may have various effects
anywhere along the request-response chain.
WWW-Authenticate Indicates the authentication scheme that should be used to access
the requested entity.
Set-Cookie an HTTP cookie

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Send Mail using SMTP Authentication

Sending Mail from PHP Using SMTP Authentication - Example

require_once "Mail.php";

$from = "Sandra Sender ";
$to = "Ramona Recipient ";
$subject = "Hi!";
$body = "Hi,\n\nHow are you?";

$host = "mail.example.com";
$username = "smtp_username";
$password = "smtp_password";

$headers = array ('From' => $from,
'To' => $to,
'Subject' => $subject);
$smtp = Mail::factory('smtp',
array ('host' => $host,
'auth' => true,
'username' => $username,
'password' => $password));

$mail = $smtp->send($to, $headers, $body);

if (PEAR::isError($mail)) {
echo("
" . $mail->getMessage() . "
");
} else {
echo("Message successfully sent!
");
}
?>

Sending Mail from PHP Using SMTP Authentication and SSL Encryption - Example

require_once "Mail.php";

$from = "Sandra Sender ";
$to = "Ramona Recipient ";
$subject = "Hi!";
$body = "Hi,\n\nHow are you?";

$host = "ssl://mail.example.com";
$port = "465";
$username = "smtp_username";
$password = "smtp_password";

$headers = array ('From' => $from,
'To' => $to,
'Subject' => $subject);
$smtp = Mail::factory('smtp',
array ('host' => $host,
'port' => $port,
'auth' => true,
'username' => $username,
'password' => $password));

$mail = $smtp->send($to, $headers, $body);

if (PEAR::isError($mail)) {
echo("" . $mail->getMessage() . "
");
} else {
echo("Message successfully sent!
");
}
?> Reference URL is http://www.9lessons.info/2009/10/send-mail-using-smtp-and-php.html

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