PHP Assignment Help
PHP Assignment
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What is PHP?PHP is a scripting language commonly used on web
servers.Stands for PHP: Hypertext PreprocessorOpen sourceEmbedded
codeComparable with ASPMultiple operating systems/web servers
PHPdeveloped in 1995 by Rasmus Lerdorf (member of the Apache
Group)originally designed as a tool for tracking visitors at
Lerdorf's Web sitewithin 2 years, widely used in conjunction with
the Apache serverdeveloped into full-featured, scripting language
for server-side programmingfree, open-sourceserver plug-ins exist
for various serversnow fully integrated to work with mySQL
databasesPHP is similar to JavaScript, only its a server-side
languagePHP code is embedded in HTML using tagswhen a page request
arrives, the server recognizes PHP content via the file extension
(.php or .phtml)the server executes the PHP code, substitutes
output into the HTML pagethe resulting page is then downloaded to
the clientuser never sees the PHP code, only the output in the
page
Why it is used?Dynamic generation of web-page contentDatabase
interactionProcessing of user supplied dataEmailFile handlingText
processingNetwork interaction
Hello World! PHP Test
Using your favoured text editor (e.g. Notepad) create the file
on the slide
Save it in your web space as hello.php and navigate to the file
via your web browser
You should seeHello World! On the page
If that has worked replace all with phpinfo(); and run again
You should now see a page with lots of information about the PHP
installation this will become useful later!
NOT XHTML (NO DOCTYPE SETTING ETC) TO SAVE SPACE ON PAGE
Comments// This is a comment# This is also a comment/* This is a
commentthat is spread overmultiple lines */Do not nest multi-line
comments// recommended over #
Comments
Variables: Naming$ followed by variable nameCase
sensitive$variable differs from $VariableStick to lower-case to be
sure!Name must started with a letter or an underscoreFollowed by
any number of letters, numbers and underscores
Variables: example
Demo the fact that the variable can be changed..
$name = Phil;$age = 23;$name = Ed;echo $name;echo is ;echo
$age;// Ed is 23
ConstantsConstants (unchangeable variables) can also be
defined.Each constant is given a name (note no preceding dollar is
applied here).By convention, constant names are usually in
UPPERCASE.
A constant is an identifier for a single valueCannot be changed
during execution (or undefined)Same naming convention as a standard
variable (just no $)Are global (can be accessed anywhere within
functions, etc.)
There are many predefined constants (see www.php.net for the
long list!)Core constantsSet in the PHP coreMostly to do with error
tracking and also core items like version, install directories,
etc.Standard constantsLoads more!Extension constantsThese are set
by extensions if they are loadedSee individual extension
descriptions for details
Constants
OperatorsArithmetic Operators: +, -, *,/ , %, ++, --Assignment
Operators: =, +=, -=, *=, /=, %=
Comparison Operators: ==, !=, >, =,
PHP - Forms
Access to the HTTP POST and GET data is simple in PHP The global
variables $_POST[] and $_GET[] contain the request data
