php tutorial variables & comments 01

PHP Course PHP is a server scripting language, powerful tool for

making dynamic and interactive Web pages..

This presentation provide you with PHP source code and the HTML

output of that code………….Enjoy!.

PHP Course [email protected]

Instructor Name: Mohamed Saad.

Email: [email protected]

Occupation: Web Developer In IT Big Dig.


http://itbigdig.com/

PHP Course 1: Variables & Comments


Naming Rules


• $ sign then Name of the variable.

• Begin with a letter or the underscore character.

• Name can only contain alpha-numeric characters and

underscores.

• Name Should not contain spaces.

• Variable names are case sensitive.

• No command for declaring a variable.

Variables

Variables Scopes


Global Declared outside of any function.

Local Declared within a PHP function can only be accessed within that

function

Static

When a function is completed, all of its variables are normally

deleted. However, sometimes you want a local variable to not be

deleted. use the static keyword .

Parameter A parameter is a local variable whose value is passed to the

function by the calling code.

Variables Data Types


String Hello Mohamed Saad

Integer 48, -5, 160,…

Double 2.209, -1.3, 3.14,…

Boolean True or False

Date 2015-12-31 12:55:22


Athematic Operators

Operator Name Description

A + B Addition Sum of A and B

A - B Subtraction Difference of A and B

A * B Multiplication Product of A and B

A / B Division Quotient of A and B

A % B Modulus Remainder of A divided by B

A . B Concatenation Concatenate two strings

Dreamweaver Create New Site


Dreamweaver CS 6

Dreamweaver From Site menu Select New Site


project

Navigate to desktop and create New Folder

Dreamweaver CS 6

Dreamweaver Configure Your Server


Navigate to desktop and create New Folder

Dreamweaver CS 6



Configure your server

Dreamweaver CS 6


Dreamweaver CS 6


Server name any name

FTB Address Domain

Username FTP User

Password FTP Pass

Root Folder on your host

For this Tutorial I created a Demo folder on my host and we will use it along


Dreamweaver CS 6


Dreamweaver Rename File: variables.php

Dreamweaver CS 6


PHP Tag Open variables.php and insert basic code

<?php

?>

Copy Code Open variables.php and insert basic code

<?php

?>


<!DOCTYPE html> <html>

<body> <?php ?> </body>

</html>

PHP String Data Output Data

<?php

echo “ ”;

?>

PHP String Data Store & Output Data

<?php

$VariableName= „Saad‟ ;

?>

PHP String Data Concatenation Operator

<?php

echo $first . " " . $last ;

?>

PHP String Data Get Type Function

<?php

echo gettype($user);

?>

<?php

echo strlen($user);

?>


PHP String Data String Length Function

<?php

echo strpos("Hello","H")

?>


PHP String Data Search for a text

<?php

echo chr(65)

?>


PHP String Data Character Function

Comments Insert comments & add remarks to your code.


Single Line

• //Comments here

Multi Lines

• /*

Comments here

Comments here */

Dig …? calculate the Area of square which have the

Length of 4 cm.

Print the result in • Meter (m).

• Centimeter (Cm).

• Millimeter (mm).


Answer


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Square Area</title> </head> <body> <?php $x=1;//legnth in centimeter echo "Length of the square =$x ";//Print out the length $meter=$x/1000;//legnth in meter $Ameter =$meter*$meter;//Area in meter echo "Area of the square= $Ameter M2 "; $Acent = $x*$x;//Area in centimeter echo "Area of the square= $Acent Cm2 "; $milli =$x*1000;//legnth in millimeter $Amilli=$milli*$milli;//Area in millimeter echo "Area of the square= $Amilli mm2"; ?> </body> </html>


Copy Code

We hope You enjoy This Tutorial.

For any Suggestions Please email Us

[email protected]


End Variables & Comments

Itbigdig.com

http://itbigdig.com/

php tutorial variables & comments 01

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