PHP Tutorial #3 - The Basic

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Okay, time to get your hand dirty :D

For Ubuntu / Debian distribution:
1st, the starting page for apache is default pointed /var/www/
it is configured in /etc/apache2/sites-available/default assigned as parameter of DocumentRoot
The default file to open for directory will be in /etc/apache2/mods-enabled/dir.conf as parameter of DirectoryIndex

PHP files need to be declared as .php extension by default.
The starting page will be index.php

Create a file in /var/www/index.php
Enter the content:

<?php
$sNo = 123;
echo $sNo;
?>

You will get output:

123

In this tutorial, we will only show you the very simple basic.
For more information, please refer to php documentation or tutorial found here:
http://www.php.net/manual/en/language.basic-syntax.php

In PHP, a variable type is not needed to define. You may reassign the variable at any time to any type. "$" indicate it is a variable. Each statement must end with ";"
Example:

$mVar = 123;
echo $mVar;
echo "\r\n";
$mVar = "xyz";
echo $mVar;

Output:

123
xyz

"echo" is the simple function like c print.
you may also use the function print to do it.

To call a function:
$mResult = myFunction([parameter...]);

To define your function:
Example:

function myFunction($param1, $param2)
{
$iResult = $param1 + $param2;
return $iResult;
}

To call it:
Example:

$iResult = myFunction(123, 555);
echo $iResult;

Output:

678

For comment, use c like concept:
// Line based comment
/*
Multiple line
comments...
*/

Operators

Operators in PHP is alike C.
Example:

$iResult = 123 + 555;
//result to 678

$iResult = 111 - 10;
//result to 101

$iResult = 500 / 2;
//result to 250

$iResult = 50 * 3;
//result to 150

$bResult = (1==2)
//result to false (boolean)

$bResult = (1==1)
//result to true (boolean)

$bResult = (1!=2)
//result to true

$bResult = (1!=1)
//result to false

// AND operator
$bResult = (true && false)
//result to false

$bResult = (true && true)
//result to true

// OR operator
$bResult = (true || false )
// result to true

$bResult = (false || false )
// result to false

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