The document provides an overview of PHP by Tabeer Patoli. It discusses that PHP is a server-side scripting language used for web development. PHP was originally created by Rasmus Lerdorf as a tool for observing webpage traffic and stands for Hypertext Preprocessor. It has since been upgraded and is now free and open source. The document also gives brief descriptions of PHP tags, comments, variables, constants, and operators.

1. OVERVIEW OF PHPOVERVIEW OF PHP
BY: Tabeer PatoliBY: Tabeer Patoli

2. Overview Of PHP:Overview Of PHP:
 PHP stands for Hypertext preprocessor.PHP stands for Hypertext preprocessor.
 Old name:Old name:
personal home pagepersonal home page
OROR
Professional home pageProfessional home page
 PHP is a server side scripting languagePHP is a server side scripting language
 PHP is used for web development.PHP is used for web development.
 It is used to create dynamic websites..It is used to create dynamic websites..
 It is free & open source.It is free & open source.

3. History:History:
Originally created byOriginally created by
Rasmus LerdorfRasmus Lerdorf
 PHP originallyPHP originally
stood for Personalstood for Personal
Home PageHome Page
 Used as a tool forUsed as a tool for
observing trafficobserving traffic
on webpageon webpage
 Known as fatherKnown as father
of PHP.of PHP.

4.  Upgrade in 1997 by Andi & zeev to addUpgrade in 1997 by Andi & zeev to add
OOP (Object Oriented Programming)..OOP (Object Oriented Programming)..
Andi Gutmans Zeev suraski

5.  For use the phpFor use the php
we must havewe must have
install Xamp,install Xamp,
Wamp or lamp.Wamp or lamp.
 Now adays theNow adays the
most universallymost universally
used xamp.used xamp.
 Install xamp in CInstall xamp in C
drive.drive.

6. When installing is finishedWhen installing is finished
then start the control panel:then start the control panel:

7. Php opening & closing tags:Php opening & closing tags:
There are four types of PHP tags:There are four types of PHP tags:
1.1. <?php….?><?php….?>
2.2. <?.....?><?.....?>
3.3. <%....%><%....%>
4.4. <script language=“PHP”>…</script><script language=“PHP”>…</script>
The most universally effective tag style isThe most universally effective tag style is
first one………..first one………..

8. Commenting in php:Commenting in php:
A commenting is the portion of aA commenting is the portion of a
program that exists only for the humanprogram that exists only for the human
reader.reader.
There are two commenting formats in php:There are two commenting formats in php:
 Single line commentSingle line comment
//………………////………………//
 Multi lines commentMulti lines comment
/*…………./*………….
…………………………………….*/.*/

9. Keep In mind:Keep In mind:
 Every language have print function,
Php use “echo” keyword to print the
statement.
 A statement in php is any expression
that is followed by a semicolon ”;”.
 merge two statements with dot “.”.

10. Simple programSimple program::
<?php // opening tag<?php // opening tag
echo “introduction to Php”; // printecho “introduction to Php”; // print
the statementthe statement
?> // closing tag?> // closing tag

11. Php variable types:Php variable types:
All variables in PHP are denoted with a leading dollar sign($).All variables in PHP are denoted with a leading dollar sign($).
Php has a total of seven data types:Php has a total of seven data types:
1.1. Integers are whole numbers like (45, 67)Integers are whole numbers like (45, 67)
2.2. Doubles are floating point numbers like (58.4, 67.2)Doubles are floating point numbers like (58.4, 67.2)
3.3. Booleans have only two possible values either true or false.Booleans have only two possible values either true or false.
4.4. Null is a special type that only has one value: null.Null is a special type that only has one value: null.
5.5. Strings are sequences of characters .Strings are sequences of characters .
6.6. Arrays are named & indexed collections of different dataArrays are named & indexed collections of different data
types.types.
7.7. Resources are special variables that hold references to resourceResources are special variables that hold references to resource
external to php (such as database connections)external to php (such as database connections)
Note:Note: variable name can consist of numbers, letters, underscores,variable name can consist of numbers, letters, underscores,
but you cant use characters like (+,-,%,) etc.but you cant use characters like (+,-,%,) etc.
There Is no size limit for variables.There Is no size limit for variables.

12. Php constantsPhp constants
 A constant is a name or identifier for a simple value. A constantA constant is a name or identifier for a simple value. A constant
value can not change during the execution of the script.value can not change during the execution of the script.
 To define the constant you have to use define() function.To define the constant you have to use define() function.
 Constant identifiers are always in upper case.Constant identifiers are always in upper case.
 You have not need to have a constant with a $.You have not need to have a constant with a $.
 Constant define in single comma.Constant define in single comma.
Example:Example:
<?php<?php
define(‘MINSIZE’, 50);define(‘MINSIZE’, 50);
echo MINSIZE;echo MINSIZE;
?>?>

13. Php Operators:Php Operators:
Php supports following type of operators:Php supports following type of operators:
 Arithmetic operatorsArithmetic operators
 Comparison operatorsComparison operators
 Logical operatorsLogical operators
 Assignment operatorsAssignment operators
 Conditional (or ternary) operatorsConditional (or ternary) operators

14. Thank youThank you