Role of PHP in Web Application Development

ROLE OF PHP IN WEB
APPLICATION

ROLE OF PHP IN WEB
APPLICATION
PHP IS A SERVER SIDE SCRIPTING
LANGUAGE WHICH IS USED TO DEVELOP A
DYNAMIC AND ATTRACTIVE WEB
APPLICATIONS.
PHP CAN ALSO BE USES AS A LANGUAGE
FOR COMMAND LINE SCRIPTING AND
DESKTOP APPLICATIONS. BUT IT'S WIDELY
USED FOR WEB APPLICATION.

ROLE OF PHP IN WEB
APPLICATION
TO UNDERSTAND THE ROLE OF PHP LET'S LOOK AT
HOW A NORMAL WEB REQUEST AND A WEB
REQUEST THAT INVOLVES PHP HAPPEN. PLEASE
NOTE THAT THERE CAN BE MANY INTERMEDIATE
STEPS INVOLVED BUT ONLY THE MAIN AND
IMPORTAN ONES HAVE BEEN MENTIONED FOR
UNDERSTANDING PURPOSES.

CYCLE OF A NORMAL WEB
REQUEST
LOCATE intro.html AND
SEND IT AS
RESPONSE
CLIENT
REQUEST
FOR
intro.html
RESPONSE FROM intro.html
SERVER

CYCLE OF A WEB
REQUEST THAT
INVOLVES PHP
SEND THE REQUEST
TO PHP ENGINEAND
SEND ITS OUTPUT
AS THE RESPONSE
PHP ENGINE
CLIENT
REQUEST
FOR intro.php
RESPONSE FROM intro.php
SERVER

HOW PHP ENGINE
OUTPUTS CONTENT
WHEN PHP INTERPRETER READS A FILE, IT
ONLY PROCESSES LINES BETWEEN

<php !

TAGS. IT OUTPUTS REST OF THE LINES
WITHOUT ANY PROCESSING.

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