ABC of Computing - From Novice to Professional

How to Write PHP code and HTML code within a same file

2018-08-31T23:49:00.001+06:00

A PHP file can have both PHP code and HTML code together.
Any HTML code written outside of PHP <?php //php code here… ?> Code is ignored by the PHP parser which allows PHP files to have PHP code and HTML code in a same file.
A PHP file must have “.php” extension.
Sample “index.php” file code is given bellow:

<!DOCTYPE html>
<html>
<head>
<title>Web Page Title</title>
</head>
<body>
<?php
 echo "<h1>HTML Code inside PHP code </h1>";
?>
<h1>This is a Heading</h1>
<?php
 echo "Today's Date is ".date("d-m-y");
?>
<p>This is a paragraph.</p>

</body>
</html>

Output of above code:
HTML Code inside PHP code

This is a Heading
Today's Date is 01-09-18
This is a paragraph.

# Book on PHP:

Learning PHP, MySQL & JavaScript: With jQuery, CSS & HTML5 (Learning PHP, MYSQL, Javascript, CSS & HTML5)

What are PHP tags?

2018-08-28T22:56:00.001+06:00

PHP code starts with start tag <?php and end with end tag ?>
PHP code can also start with short open tag <? .To use this short tag you have to enable short_open_tag in php configuration file “php.ini”
Before PHP version 7, PHP also supported ASP tags <%, %>, ASP short open tag for <%=, and the script tag <script language="php"> which has been removed from PHP version 7.
If a PHP file have only PHP codes inside the file then it is preferable to omit the PHP closing tag ?> at the end of the a PHP file.
Example of PHP Tag

<?php // Start PHP Tag
 echo "PHP is easy to learn !!";
 echo "PHP code is executed on web server !!";

 // End PHP Tag ?>

Output of above PHP code:

PHP is easy to learn !!PHP code is executed on web server !!

# Good book on PHP:

PHP for the Web: Visual QuickStart Guide (5th Edition)

What are the Functionalities of PHP?

2018-08-26T23:51:00.002+06:00

PHP is a powerful programming language which can be used to develop almost any kind of websites. Some most popular php functionalities are given bellow:

PHP is widely used to make dynamic web pages within very short time.
Send & Receive Email with PHP is very easy.
PHP can quickly Generate, Read, Write, Delete, Open and Close any files on the web servers.
PHP is perfect language to work with data Select, Insert, Delete, Update records in database.
PHP can be used to collect data from registration form, Login from etc forms.
PHP can Send and Receive cookies data stored on client machine.
PHP can store session data on servers.
PHP can be used to Control user-access on websites.
PHP can Encrypt data securely.
PHP can Compress files.
PHP can be used to Resize & photo enhancement.
PHP can easily create PDF files ,XML Files, Flash files etc for websites.

Why should you learn PHP?

2018-08-26T23:33:00.001+06:00

PHP is easy to learn.
PHP Web developer has huge demand in Job Market.
PHP runs on various platforms like Windows, Linux, Unix, Mac OS etc.
PHP supports a wide range of databases like Oracle, MySql, PostgreSQL, MongoDB etc
PHP is free.You can download PHP from the official PHP websites: www.php.net
PHP is a widely-used open source scripting language
PHP is used to make Facebook, Wordpress, Yahoo etc websites.
PHP is the best language which should be know by all web developers.

Head First PHP & MySQL: A Brain-Friendly Guide

What is PHP?

2018-08-26T23:25:00.002+06:00

PHP stands for "PHP Hypertext Preprocessor"
PHP is a widely-used general-purpose scripting open source scripting language.
PHP is especially used for web development and PHP can be embedded into HTML.
PHP scripts are executed on the web server.
A PHP script starts with start tag "<?php" and ends with end tag "?>"
PHP files have extension ".php". Example of some php files can be index.php, about.php, home.php, contact.php
PHP is a powerful programming language which has been used to create Facebook, Wordpress, Yahoo etc websites.
Sample PHP Code:

<html>
    <head>
        <title>Example</title>
    </head>
    <body>

        <?php
            echo "Hello World!";
        ?>

    </body>
</html>

Output of the above PHP Code:
Hello World!

Beginning PHP and MySQL: From Novice to Professional

What is SEO (Search Engine Optimization)

2017-11-07T11:28:00.000+06:00

SEO stands for "Search engine optimization".
All major search engines such as Google, Bing and Yahoo have paid and unpaid search results.
SEO is the process of getting more visitor to a website from search engine's Unpaid, natural, organic results.
SEO professionals do On Page SEO and Off Page SEO to get more visitors to a website from Search Engine results.

The Art of SEO: Mastering Search Engine Optimization

Difference between HTML and HTML5

2017-09-07T21:49:00.001+06:00

Hypertext Markup Language (HTML) is the standard markup language for creating web pages and web applications.
HTML5 is the W3C Recommendation which adds more powerful features such as header,footer,canvas,audio and video tag support.

Every website is created with HTML and not all modern website is developed with html5 standard.
If you know HTML very well then you can create any Web sites.
HTML is very easy to learn.
As html5 is the latest version of html,so definitely html5 is better than html.
By following this HTML tutorial series, you will be an expert on HTML.
Example of popular websites are news website, search engine , video, email, social, sports, social network, games etc
Example HTML5 Code

<!DOCTYPE html>
<html>
  <head>
    <title>Website Title</title>
  </head>
  <body>
  <h1>HTML TUTORAIL</h1>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. </p>
 <h1>What is Lorem Ipsum?</h1>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. </p>
 <h1>What is Lorem Ipsum?</h1>
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. </p>
  </body>
</html>

Output of the above HTML Code:
HTML TUTORAIL
Lorem Ipsum is simply dummy text of the printing and typesetting industry.

What is Lorem Ipsum?
Lorem Ipsum is simply dummy text of the printing and typesetting industry.

What is Lorem Ipsum?
Lorem Ipsum is simply dummy text of the printing and typesetting industry.

Murach's HTML5 and CSS3, 4th Edition

PHP7 Unable to load php_curl.dll extension on windows

2017-06-19T10:45:00.001+06:00

Problem:

PHP Startup: Unable to load dynamic library 'C:\\php7\\ext\\php_curl.dll' - The operating system cannot run %1.\r\n in Unknown on line 0

Solution:

Step1: Uncomment the php_curl.dll from php.ini

Step2: Copy the following three files from php installed directory.i.e "C:\\php7".

libeay32.dll,
libssh2.dll,
ssleay32.dll

Step3: Paste the files under two place

httpd.conf's ServerRoot directive. i.e "C\Apache24"
apache bin directory. i.e "C\Apache24\bin"

Step4: Restart apache.

That's all. I solve the problem by this way.Hope it might work for you.

Mastering PHP 7: Design, configure, build, and test professional web applications

What is HTML (Hyper Text Markup Language)

2017-05-07T16:52:00.002+06:00

HTML stands for Hyper Text Markup Language.
HTML is the standard markup language for creating Web pages of websites.
HTML declare the layout structure of Web pages using markup language code.
HTML markup are written by tags (h1, h2 for heading ,p for paragraph and so on)
Web Browsers like Mozilla Firefox, Google Chrome , Internet Explorer etc are used to show HTML output.
When we visit a website such as http://www.facebook.com we see the output of html code that was written for facebook.
Web browsers render the html source code to human readable format which is displayed as images, text,multimedia contents.
Beside html, CSS , JavaScript are also use within a html page.

Web Browsers are Used to Show HTML Output

HTML: A Beginner's Guide, Fifth Edition

Write a program in Java to show all files and directory name of a given location

2016-09-26T12:50:00.001+06:00

Solution:
If you want to run this Java program, you have to do the following:

Step1: Your computer must have JDK installed to run and compile any Java program.
Step2: Create a file name DirfileList.java with the source code given bellow and save the file on any location on your computer.
Step3: Compile and Run the java program to get the output.

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class DirfileList {

    public static void main(String[] args) {
        // TODO code application logic here

        try {
            // Set directory path name 
            File path = new File("F:/test");

            // Get list of files
            File[] listOfFiles = path.listFiles();

            // Declare file name list
            List<String> file_names = new ArrayList<String>();

            // Declare directory name list
            List<String> dir_names = new ArrayList<String>();

            // Loop throw the files and directory name and store the names in List
            for (int i = 0; i < listOfFiles.length; i++) {

                if (listOfFiles[i].isFile()) {
                    file_names.add(listOfFiles[i].getName());
                } else if (listOfFiles[i].isDirectory()) {
                    dir_names.add(listOfFiles[i].getName());
                }
            }

            // Print file names
            for (String fName : file_names) {
                System.out.println("File:" + fName);
            }

            // Print directory names
            for (String dName : dir_names) {
                System.out.println("Directory:" + dName);

            }
        } catch (Exception e) {
            System.out.println("!! Error:" + e.toString());
        }

    }

}

Java: A Beginner's Guide, Sixth Edition

What is JavaServer Faces (JSF) in Java programming language ?

2016-06-01T16:57:00.003+06:00

JSF is a component-based MVC(Model View Controller) framework which enables you to completely separate Java code from HTML pages.
It is a new technology for developing server-side Web applications using Java.

For example: to display a table with rows and columns you can add a table component to a page, there is no need to write html table , tr ,td tags with loop structure to show table data in JSF.

JSF has the following parts:

A set of user interface components(HTML tags, form, table, JSF component)
An event-driven programming model
A component model that enables third-party developers to supply additional components

The application developed using JSF is easy to debug and maintain.

Core JavaServer Faces (3rd Edition)
Mastering JavaServer Faces (Java)

What do you mean by Exception handling in programming language?

2016-05-29T11:26:00.001+06:00

An exception is an error that occurs at run time.
Run time errors are errors that cause a program to terminate abnormally.
Run time errors occur while a program is running if the environment detects an operation that is impossible to carry out.
Most of the well known computer programming language like Java, C++ have exception handling mechanism by which a programmer can handle run-time errors of the program.
Some common exceptions are divide-by-zero or file-not-found etc.

Programming Languages
Error Types, Systematic Debugging, Exceptions

What is Inheritance in OOP(Object Oriented Programming) ?

2016-04-21T01:31:00.003+06:00

Inheritance is the process by which one object can acquire the properties of another object.

In reality as Children get properties from Parents. Similarly in OOP(Object Oriented Programming) using inheritance a Child class can extends the data and member from its parent class.

There are various types of inheritance, based on paradigm and specific language.

Single inheritance : Where subclasses inherit the features of one super class. A class acquires the properties of another class.
Multiple inheritance: Where one class can have more than one super class and inherit features from all parent classes.
Multilevel inheritance : Where a subclass is inherited from another subclass. Hierarchical inheritance: Where one class serves as a superclass (base class) for more than one sub class.
Hybrid inheritance: a mix of two or more of the above types of inheritance.

Object-Oriented Programming in C++ (4th Edition)
Object-Oriented Programming for Dummies

What is Polymorphism in OOP ?

2016-04-21T01:13:00.001+06:00

Polymorphism (from Greek, meaning “many forms”) is the mechanism that allows one interface/method/function/procedure to access a general class of actions.
More generally, the concept of polymorphism is often expressed by the phrase “one interface, multiple methods.”
This means that it is possible to design a generic interface to a group of related activities.

Polymorphism helps reduce complexity by allowing the same interface to be used to specify a general class of action.

Sams Teach Yourself C++ in One Hour a Day (7th Edition)

What do you mean by encapsulation in OOP ?

2016-04-21T01:03:00.001+06:00

Encapsulation is a programming mechanism that binds together code and the data it manipulates and apply restricting access to some of the object's components.

In an object-oriented language, it is a language construct that facilitates the bundling of data with the methods or other functions operating on that data.

Class (extensible program-code-template for creating objects) is used to ensure encapsulation of data and method in Object Oriented Programming.

Intro to Java Programming, Comprehensive Version (10th Edition)
Java: How to Program, 9th Edition (Deitel)

What do you mean by Object-Oriented Programming ?

2016-04-21T00:53:00.001+06:00

Object-oriented programming (OOP) is a programming paradigm based on the concept of objects which may contain data and code what will operate on the data.
Object refers to a particular instance of a class where the object can be a combination of variables, functions, and data structures.
In OOP the variable declared inside a Class (self defined data type like int, char, float etc is primitive type ) is called Data & the function declared inside a Class is called method.
Object-oriented programming took the best ideas of structured programming and combined them with several new concepts. It is a different way of organizing a program.
Example: In reality everything is object of its class like CAR is an object of CAR class. Any person is an object of Human Class, Mango is an object of Fruit class, Rose is an object of Flower class etc.

PHP Advanced and Object-Oriented Programming: Visual QuickPro Guide (3rd Edition) (Visual QuickPro Guides)

What is Java Bytecode ?

2016-04-21T00:33:00.002+06:00

When a Java program source is compiled, the output of the Java compiler is called bytecode.
Many language generate executable code after compilation.
In Java the output is converted to a special type of file which is called the bytecode.
Bytecode is a highly optimized set of instructions designed to be executed by the Java run-time system,which is called the Java Virtual Machine (JVM).
Bytecode makes it much easier to run a program in a wide variety of environments because only the JVM needs to be implemented for each platform.

Java: A Beginner's Guide, Seventh Edition

What is Java Applets and Java Servlet ?

2016-04-21T00:16:00.004+06:00

Java Applet

An Java applet is a special kind of small Java program that is designed to be transmitted over the Internet and automatically executed by a Java-compatible web browser.
Applet are typically used to display data provided by the server, handle user input, or provide simple functions, such as a loan calculator, that execute locally on client machine, rather than on the server.
An applet is downloaded on demand, without further interaction with the user.
When a user clicks a link that contains an applet, the applet will be automatically downloaded and run in the browser.

Java Servlet:

A servlet is a small program that executes on a server.
Servlets dynamically extend the functionality of a web server and applets dynamically extend the functionality of a web browser.
Java spanned both sides of the client/server connection with Applet and Servlet.

Java: The Complete Reference, Tenth Edition (Complete Reference Series)

How Java is relates to C, C++ & C# programming language

2016-04-20T23:35:00.002+06:00

Java programming language syntax come from C programming language.
Java language object model is adapted from C++ programming language.
Java also inherits design philosophy from C/C++.
Although Java was influenced by C++, it is not an enhanced version of C++.
Java has many distinct features than C/C++.
Microsoft developed the C# (C- Sharp) language after few years of the creation of Java & C# is closely related to Java.
Many of C#’s features directly parallel Java.
Both Java and C# share the same general C++-style syntax, support distributed programming, and utilize the same object model.
There are, of course, differences between Java and C#, but the overall “look and feel” of these languages is very similar.

Java All-in-One For Dummies (For Dummies (Computers))

What is Java (programming language)

2016-04-20T23:20:00.002+06:00

Java is a general-purpose,powerful and versatile computer programming language for developing software running on mobile devices, desktop computers, and servers.
Java was developed by a team led by James Gosling at Sun Microsystems.
Sun Microsystems was purchased by Oracle in 2010.
Originally called Oak,Java was designed in 1991 for use in embedded chips in consumer electronic appliances.
In 1995, renamed Java, it was redesigned for developing Web applications.
The Java programming language is well known for the following reason:
Java is Simple and easy to learn,
Object oriented,
Distributed,
Interpreted,
Robust,
Secure,
Architecture neutral,
Portable,
High performance,
Multi-threaded, and dynamic.

Java: A Beginner's Guide, Sixth Edition

How to start & stop Apache httpd 2.4.* Web Server on linux

2015-10-11T11:43:00.002+06:00

You can start & stop apache httpd version 2.4.* web server on linux using two simple linux command given bellow.
Step 1: Start Apache Command :

[root@webservr]#

apachectl start

Step 2: Stop Apache Command

[root@webservr]#

 apachectl stop

Step3: Its Done.

Apache HTTP Server 2.4 Reference Manual 3/3 (Volume 3)

How to redirect your website from HTTP to HTTPS on Apache HTTP Web Server

2015-09-12T00:54:00.004+06:00

You can automatically redirect your website visitor from http://www.yourwebsite.com to https://www.yourwebsite.com in various ways.
This blog post will show you how to redirect your website from http to https using a simple .htaccess file saved on your web server.
Step 1: Install & configure mod_ssl on your Apache HTTP Server.
Step 2: Enable the mod_rewrite modules by editing the ‘httpd.conf’ apache configuration file.
Step 3: create an ‘.htaccess’ file and write the following code on that .htaccess file & save the file on your web server document root directory.

 RewriteEngine On
 RewriteCond %{HTTPS} off
 RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

Step 4: That’s all. Now your website will always redirect from http://www.yourwebsite.com to https://www.yourwebsite.com

Pro Apache (Expert's Voice)

WordPress theme & plugins installation “Download failed” problem solved

2015-02-26T22:05:00.002+06:00

If you are getting an error message while tried to install any WordPress theme or plug-ins from wordpress admin panel. If the error message says “Download failed. There are no HTTP transports available which can complete the requested request.”. Then this post might help you.

Step1: You have to edit your php.ini file, so find the php.ini file & open it with notepad.

Step2: Find “php_curl” extension on the php.ini file

Step3: After finding, now enable the php_curl extension by removing the semicolon (;)

Step4: save the php.ini file & close it
Step5: Restart the apache service.
Step6: It’s done.
Now you can download any wordpress themes & plugins from wordpress admin panel.

WordPress All-in-One For Dummies

Windows 7 volume increasing and decreasing problem solution

2014-04-05T23:03:00.003+06:00

If you are facing volume increasing and decreasing automatically on windows 7 and looking for a perfect solution then this blog post might help you:

Step1: Go to Control Panel(Start->Control Panel) & Click on View by "Large Icon" to sort the view & show all icon.

Step2: Click on Sound

Step3: Click on Speaker icon then click on Property or double click on the Speaker Icon.

Step4: Click on Enhancement Tab, then click on the "Disable all sound effects" check box, then Click OK.

Step5: Close all audio player(winamp, Media player etc) if any is running then start again the player.

Step6: Yes... it's done. Now enjoy your music without volume increasing and decreasing problem.

Windows 7 Professional With SP1 64 Bit OEM - 1 PC

How to use same internet connection on multiple devices without buying any Wifi router?

2014-03-24T23:49:00.000+06:00

If you want to use same internet connection on your laptop, Smartphone, tablet, ipad at a time without buying a wifi router, then this blog post might help you.

Step 1: I am using Teletalk 3G internet line on my laptop computer & you may use any internet connection from your laptop.

Teletalk-3G modem

Step 2: Download & install the virtual router plus software from http://virtualrouterplus.com/download2/

Step 3: Open the virtualrouterplus software & don't change the Network Name(SSID). Set a password (i.e shafiq123) & select the shared connection as Teletalk-Internet (your internet connection).

Step 4: Click on Start Virtual router plus

Virtualrouterplus

Step 5: Now your computer will act as a virtual wifi hotspot & you can connect to the internet from any wi-fi enable SmartPhone or other device using this connection.

Step 6: To use the wi-fi hotspot created on step5, enable wi-fi connection from your smart phone, tablet or other devices.

Step 7: You will find a wi-fi connection named “virturouterplus.com” which is secure with password, select the connection and set the password (i.e shafiq123) as you have already set on step3.

Step 8:Wait sometime to get connected with your virtual wifi-hotspot.

Step 9: It's Done. Now you are connected to the internet from your smart devices.

TP-Link N450 Wi-Fi Router - Wireless Internet Router for Home(TL-WR940N)