Php tutorial

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PHP TUTORIAL
PHP Programming
With
My SQL Connection
www.kumarvijaybaswa.blogspot.com

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PHP: The Basics
 Why PHP and MySQL?

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What Is PHP?
 PHP is the Web development language written by and for Web
developers.
 PHP stands for PHP: Hypertext Preprocessor. The product was
originally named Personal Home Page Tools, and many people still
think that’s what the acronym stands for. But as it expanded in scope,
a new and more appropriate name was selected by community vote.
PHP is currently in its fifth major rewrite, called PHP5 or just plain
PHP.

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Server-Side Scripting
 A “script” is a collection of program or sequence of instructions that is
interpreted or carried out by another program rather than by the computer
processor.
 Client-side
 Server-side
 In server-side scripting, (such as PHP, ASP) the script is processed by the
server Like: Apache, ColdFusion, ISAPI and Microsoft's IIS on Windows.
 Client-side scripting such as JavaScript runs on the web browser.

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Advantages of Server-Side Scripting
 Dynamic content.
 Computational capability.
 Database and file system access.
 Network access (from the server only).
 Built-in libraries and functions.
 Known platform for execution (as opposed
to client-side,
 where the platform is uncontrolled.)
 Security improvements

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INTRODUCTION TO PHP
 PHP stands for PHP: Hypertext Preprocessor
 Developed by Rasmus Lerdorf in 1994
 It is a powerful server-side scripting language for creating
dynamic and interactive websites.
 It is an open source software, which is widely used and free to
download and use (PHP is FREE to download from the official
PHP resource: www.php.net).
 It is an efficient alternative to competitors such as Microsoft's
ASP.

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 PHP is perfectly suited for Web development and can be
embedded directly into the HTML code.
 The PHP syntax is very similar to JavaScript, Perl and C.
 PHP is often used together with Apache (web server) on
various operating systems. It also supports ISAPI and can
be used with Microsoft's IIS on Windows.
 PHP supports many databases (MySQL, Informix, Oracle,
Sybase,
 Solid, PostgreSQL, Generic ODBC, etc.)
INTRODUCTION TO PHP

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What is a PHP File?
 PHP files have a file extension of ".php", ".php3", or
".phtml"
 PHP files can contain text, HTML tags and scripts
 PHP files are returned to the browser as plain HTML
INTRODUCTION TO PHP

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What you need to develop PHP Application:
 Install Apache (or IIS) on your own server, install PHP, and
MySQL
 Install Wampserver2 or XAMPP (a bundle of PHP,
Apache, and MySql server) on your own server/machine
INTRODUCTION TO PHP

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PHP Syntax
 A PHP scripting block always starts
with <?php and ends with ?>
 <?php……………. ?>

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Example simple html & php page
 PHP and HTML Code:
<html>
<head>
<title>My First PHP Page
</title>
</head>
<body>
<?php
echo "Hello World!";
?>
</body> </html>

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PHP VARIABLES
 Variables are used for storing values, such as
numbers, strings or function results, so that they can
be used many times in a script.
 All variables in PHP start with a $ sign symbol.
 Variables are assigned using the assignment
operator "=“
 Variable names are case sensitive in PHP:
 $name is not the same as $NAME or $Name.
 In PHP a variable does not need to be declared before
being set.
 PHP is a Loosely Typed Language.

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Example:
 <?php
 $var1 = 'PHP'; // Assigns a
value of 'PHP' to $var1
 $var2 = 5; // Assigns a value
of 5 to $var2
 $var3 = $var2 + 1; // Assigns
a value of 6 to $var3
 $var2 = $var1; // Assigns a
value of 'PHP' to $var2
 echo $var1; // Outputs 'PHP‘
 echo "<br />";
 echo $var2; // Outputs 'PHP'
 echo "<br />";
 echo $var3; // Outputs '6'
 echo "<br />";
 echo $var1 . ' rules!'; //
Outputs 'PHP rules!'
 echo "$var1 rules!"; //
Outputs 'PHP rules!'
 echo '$var1 rules!'; // Outputs
'$var1 rules!‘
 ?>

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VARIABLE SCOPE AND LIFETIME
 The scope of a variable defined within a
function is local to that function.
 A variable defined in the main body of code
has a global scope.
 If a function needs to use a variable that is
defined in the main body of the program, it
must reference it using the "global"
keyword, like this:

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Example:
 <?php
 function mul()
 {
 global $start;
 print "<tr>";
 for ($num=1; $num <= 10; $num++ )
 {
 $cell = $num * $start;
 print "<td> " . $cell . " </td>";
 }
 print "</tr>";
 }
 $start = 0;

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 print "<table border=1
cellpadding=3>";
 while ( $start <=10 )
 {
 mul();
 $start++;
 }
 print "</table>";
 ?>

Php tutorial

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