What is PHP? PHP stands for PHP: Hypertext Preprocessor PHP is a server-side scripting language, like ASP PHP scripts are executed on the server PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.) PHP is an open source software PHP is free to download and use
What is a PHP File? PHP files can contain text, HTML tags and scripts PHP files are returned to the browser as plain HTML PHP files have a file extension of ".php", ".php3", or ".phtml"
What is MySQL? MySQL is a database server MySQL is ideal for both small and large applications MySQL supports standard SQL MySQL compiles on a number of platforms MySQL is free to download and use
PHP + MySQL PHP combined with MySQL are cross- platform (you can develop in Windows and serve on a Unix platform)
Why PHP? PHP runs on different platforms (Windows, Linux, Unix, etc.) PHP is compatible with almost all servers used today (Apache, IIS, etc.) PHP is FREE to download from the official PHP resource: www.php.net PHP is easy to learn and runs efficiently on the server side
Start With PHP To start with PHP you will need to install PHP 5.0 or higher. In addition to PHP you should install MY SQL as database You can download PHP from
How the PHP works
OOP What Is an Object? An object is a software bundle of related state and behavior. Software objects are often used to model the real-world objects that you find in everyday life. What is a class? Class is a collection of a objects with common properties.
Object Software objects are conceptually similar to real- world objects: they too consist of state and related behavior. An object stores its state in fields (variables in some programming languages) and exposes its behavior through methods (functions in some programming languages). Methods operate on an objects internal state and serve as the primary mechanism for object-to-object communication. Hiding internal state and requiring all interaction to be performed through an objects methods is known as data encapsulation — a fundamental principle of object-oriented programming.
Object Objects are key to understanding object-oriented technology. Look around right now and youll find many examples of real-world objects: your dog, your desk, your television set, your bicycle. Real-world objects share two characteristics: They all have state and behavior. Dogs have state<attributes> (name, color, breed, hungry) and behavior (barking, fetching, wagging tail). Bicycles also have state (current gear, current pedal cadence, current speed) and behavior (changing gear, changing pedal cadence, applying brakes). Identifying the state and behavior for real-world objects is a great way to begin thinking in terms of object-oriented programming.
Class In the real world, youll often find many individual objects all of the same kind. There may be thousands of other bicycles in existence, all of the same make and model. Each bicycle was built from the same set of blueprints and therefore contains the same components. In object-oriented terms, we say that your bicycle is an instance of the class of objects known as bicycles. A class is the blueprint from which individual objects are created.
What Is Inheritance? Different kinds of objects often have a certain amount in common with each other. Mountain bikes, road bikes, and tandem bikes, for example, all share the characteristics of bicycles (current speed, current pedal cadence, current gear). Yet each also defines additional features that make them different: tandem bicycles have two seats and two sets of handlebars; road bikes have drop handlebars; some mountain bikes have an additional chain ring, giving them a lower gear ratio. Object-oriented programming allows classes to inherit commonly used state and behavior from other classes. In this example, Bicycle now becomes the superclass of MountainBike, RoadBike, and TandemBike. In the Java programming language, each class is allowed to have one direct superclass, and each superclass has the potential for an unlimited number of subclasses:
Interface Interface makes the relationship between classes and functionality to those classes implement easier to understand and to design A interface is a collection of methods that indicate a class has some behavior in addition to what in inherits from supper class;
Packages Packages are use to grouping related classes and interfaces Java has many packages than make our work lot easier For take advantages of other packages you must import them
Basic PHP SyntaxA PHP scripting block always starts with <?php and ends with ?>. A PHP scripting block can be placed anywhere in the document.
<html> <body> <?php //This is a comment /* This is a comment block */ ?> </body> </html>
Variables in PHP Variables in PHP Variables are used for storing values, like text strings, numbers or arrays. When a variable is declared, it can be used over and over again in your script. All variables in PHP start with a $ sign symbol.
Array The array functions allow you to manipulate arrays. PHP supports both simple and multi- dimensional arrays. There are also specific functions for populating arrays from database queries. Syntax array(key => value)
Assignment OperatorsOperator Example Is The Same As= x=y x=y+= x+=y x=x+y-= x-=y x=x-y*= x*=y x=x*y/= x/=y x=x/y.= x.=y x=x.y%= x%=y x=x%y
Comparison operatorsOperator Description Example== is equal to 5==8 returns false!= is not equal 5!=8 returns true<> is not equal 5<>8 returns true> is greater than 5>8 returns false< is less than 5<8 returns true>= is greater than or equal to 5>=8 returns false<= is less than or equal to 5<=8 returns true
Logical OperatorsOperator Description Example&& and x=6 y=3 (x < 10 && y > 1) returns true|| or x=6 y=3 (x==5 || y==5) returns false! not x=6 y=3 !(x==y) returns true
Flow Control IFelse Switch While Do while For