1. PHP is a recursive acronym for "PHP: Hypertext
Preprocessor".
3. It is integrated with a number of popular databases,
including MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL
Server.
4. PHP is pleasingly zippy in its execution, especially when
compiled as an Apache module on the Unix side. The MySQL server, once started,
executes even very complex queries with huge result sets in record-setting
time.
5. PHP supports a large number of major protocols such as
POP3, IMAP, and LDAP. PHP4 added support for Java and distributed object
architectures (COM and CORBA), making n-tier development a possibility for the
first time.
6. PHP is forgiving: PHP language tries to be as forgiving as
possible.
7. PHP Syntax is C-Like.
Common uses of PHP:
PHP performs system functions, i.e. from files on a system it
can create, open, read, write, and close them. The other uses of PHP are:
1. PHP can handle forms, i.e. gather data from files, save
data to a file, thru email you can send data, return data to the user.
2. You add, delete, modify elements within your database thru
PHP.
3. Access cookies variables and set cookies.
4. Using PHP, you can restrict users to access some pages of
your website.
5. It can encrypt data.
Characteristics of PHP:
Five important characteristics make PHP's practical nature
possible:
1. Simplicity
2. Efficiency
3. Security
4. Flexibility
5. Familiarity
"Hello World" Script in PHP :
To get a feel for PHP, first start with simple PHP scripts.
Since "Hello, World!" is an essential example, first we will create a
friendly little "Hello, World!" script.
As mentioned earlier, PHP is embedded in HTML. That means
that in amongst your normal HTML (or XHTML if you're cutting-edge) you'll have
PHP statements like this:
|
<html>
<head>
<title>Hello
World</title>
<body>
<?php echo "Hello,
World!";?>
</body>
</html>
|
It will produce following
result:
If you examine the HTML output of the above example, you'll
notice that the PHP code is not present in the file sent from the server to
your Web browser. All of the PHP present in the Web page is processed and
stripped from the page; the only thing returned to the client from the Web
server is pure HTML output.
>>>All PHP code must be included inside one of the
three special markup tags ate are recognized by the PHP Parser.
|
<?php PHP code
goes here ?>
<? PHP code goes
here ?>
|
|
<script
language="php"> PHP code goes here </script >
|
Most common tag is the <?php...?> and we will also use
the same tag in our tutorial.
From
the next chapter, we will start with PHP Environment Setup on your machine and
then we will dig out almost all concepts related to PHP to make you comfortable
with the PHP language.
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