Php

 

                                                Php Author: Rasmus Lerdorf

PHP is an open-source, interpreted, and object-oriented scripting language that can be executed

at the server-side. PHP is well suited for web development. Therefore, it is used to develop we 

applications (an application that executes on the server and generates the dynamic page.

PHP was created by Rasmus Lerdorf in 1994 but appeared in the market in 1995. PHP 7.4.0 is the latest version of PHP, which was released on 28 November. Some important points need to be noticed about PHP are as followed:

• PHP stands for Hypertext Preprocessor.
• PHP is an interpreted language, i.e., there is no need for compilation.
• PHP is faster than other scripting languages, for example, ASP and JSP.
• PHP is a server-side scripting language, which is used to manage the dynamic content of the website.
• PHP can be embedded into HTML.
• PHP is an object-oriented language.
• PHP is an open-source scripting language.
• PHP is simple and easy to learn language.

        

                                                                                                

Why use Php

• it handles dynamic content, database as well as session tracking for the website.
• You can create sessions in PHP.
• It can access cookies variable and also set cookies.
• It helps to encrypt the data and apply validation.
• Using PHP language, you can control the user to access some pages of your website.
• As PHP is easy to install and set up, this is the main reason why PHP is the best language to learn.
• PHP can handle the forms, such as - collect the data from users using forms, save it into the database, and return useful information to the user. For example - Registration form.

        

Features of Php

(1) Performance

• PHP script is executed much faster than those scripts which are written in other languages such as JSP and ASP. PHP uses its own memory, so the server workload and loading time is automatically reduced, which results in faster processing speed and better performance.

(2) Open Source

• PHP source code and software are freely available on the web. You can develop all the versions of PHP according to your requirement without paying any cost. All its components are free to download and use.

(3) Familarity with Syntax

• PHP has easily understandable syntax. Programmers are comfortable coding with it.

(4) Embedded

• PHP code can be easily embedded within HTML tags and script.

(5) Platform Independent

• PHP is available for WINDOWS, MAC, LINUX & UNIX operating system. A PHP application developed in one OS can be easily executed in other OS also

(6) Database Support

• PHP supports all the leading databases such as MySQL, SQLite, ODBC, etc.

(7) Error Reporting

• PHP has predefined error reporting constants to generate an error notice or warning at runtime. E.g., E_ERROR, E_WARNING, E_STRICT, E_PARSE.

(8) Loosely Typed Language

• PHP allows us to use a variable without declaring its datatype. It will be taken automatically at the time of execution based on the type of data it contains on its value.

(9) Web servers Support

• PHP is compatible with almost all local servers used today like Apache, Netscape, Microsoft IIS, etc.

(10) Security

• PHP is a secure language to develop the website. It consists of multiple layers of security to prevent threads and malicious attacks.

(11) Control

• Different programming languages require long script or code, whereas PHP can do the same work in a few lines of code. It has maximum control over the websites like you can make changes easily whenever you want.

(12) A Helpful PHP Community

• It has a large community of developers who regularly updates documentation, tutorials, online help, and FAQs. Learning PHP from the communities is one of the significant benefits.

Web Development

PHP is widely used in web development nowadays. PHP can develop dynamic websites easily. But you must have the basic the knowledge of following technologies for web development as well.

• HTML
• CSS
• JavaScript
• Ajax
• XML and JSON
• jQuery

How to run PHP code in XAMPP

Generally, a PHP file contains HTML tags and some PHP scripting code. It is very easy to create a simple PHP example. To do so, create a file and write HTML tags + PHP code and save this file with .php extension.

Note: PHP statements ends with semicolon (;).

All PHP code goes between the php tag. It starts with <?php and ends with ?>. The syntax of PHP tag is given below:

<?php   

//your code here  

?>  

Let's see a simple PHP example where we are writing some text using PHP echo command.

<!DOCTYPE>  

<html>  

    <body>  

        <?php  

            echo "<h2>Hello First PHP</h2>";  

        ?>  

    </body>  

</html>  

How to run PHP programs in XAMPP PHP is a popular backend programming language. PHP programs can be written on any editor, such as - Notepad, Notepad++, Dreamweaver, etc. These programs save with .php extension, i.e., filename.php inside the htdocs folder.

For example - p1.php.

As I'm using window, and my XAMPP server is installed in D drive. So, the path for the htdocs directory will be "C:\xampp\htdocs".

PHP program runs on a web browser such as - Chrome, Internet Explorer, Firefox, etc. Below some steps are given to run the PHP programs.

Step 1: Create a simple PHP program like hello world.

<?php      

    echo "Hello World!";  

?>  

Step 2: Save the file with hello.php name in the htdocs folder, which resides inside the xampp folder.

Step 3: Run the XAMPP server and start the Apache and MySQL.

Step 4: Now, open the web browser and type localhost http://localhost/hello.php on your browser window.

Step 5: The output for the above hello.php program will be shown as the screenshot below: