Step by step guide to learn php

PHP Introduction

Learn PHP with this PHP Tutorial step-by-step guide for beginners or professionals web developers. PHP is a server-side scripting language to create a dynamic webpage. Learn how to create dynamic webpages using PHP with simple examples and live demo.

What is PHP?

PHP is a server-side scripting language to create dynamic webpages. The full form of PHP is Hypertext Preprocessor. It is the most widely used, most popular scripting language to create dynamic and interactive webpages.

It was created by Rasmus Lerdorf in the year 1994 as a small open source project. Later, it becomes the most useful scripting language to create dynamic interactive web paged.

Features of PHP Language

There are various features of PHP listed below.

• It runs on the server and generates plain HTML as output.
• You can integrate it with many popular databases like MySQL, MariaDB, Oracle, Microsoft SQL Server, PostgreSQL, Sybase, and many more.
• Collect your website visitor’s data using HTML forms with PHP.
• By connecting PHP with your database like MySQL. After that, you can collect form data using PHP and store it in your local databases.
• Manipulate(like Create, Update, and Delete) data of MySQL and other databases using PHP.

Key Points of PHP Scripting Language

• The Full form of PHP is Hypertext Preprocessor.
• The creator of PHP is Rasmus Lerdorf in the year 1994.
• PHP initially named as Personal Home Page but it is known as Hypertext Preprocessor.
• It is an open-source server-side scripting language.
• The latest version of PHP is PHP 7.

You can also learn these scripting languages on this website in the other Tutorials.

PHP Reference

There are many PHP functions that you can learn in the PHP reference. The functions are useful for performing many PHP useful operations to get data from the forms and MySQL and other databases. So, don’t forget to learn all PHP functions given sequentially.

Tip: If you are a beginner and want to learn PHP completely. You must learn every PHP function. Move forward by learning the use and benefits of the functions day-by-day.

PHP Examples and Free Code Downloads

Learn PHP from the chapters given in this tutorial to learn PHP programming. Each chapter contains many useful examples with the live examples to check and test. Besides, to live examples, you will get useful code downloads to quickly start PHP on your local system.

Note: The free downloads are the files that contain the useful PHP programming codes you can use on your projects. It contains HTML, PHP codes, and linked CSS and JS files to makes learning easy for beginners. Download files as per your requirement and uses.

Check out all the chapters given below to learn every part of PHP in detail with useful examples.

PHP Interview Questions

In addition to learning PHP from step-by-step instructions, you will get many interview questions at the end of the tutorial chapters. These questions are based on PHP with answers to prepare yourself for technical interviews.

If you have any suggestions to improve the question, you can comment in the comment section of the post. Also, tell us a more useful question to include in the list of questions for more useful preparations.

Complete List of Step-by-step PHP Tutorial

Click each chapter one-by-one to Learn PHP. Learn from useful examples, live demos, and free downloads to start learning PHP quickly.

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Step by step guide to learn php

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Comments and Discussions

dan, mysql_real_escape_string() does not work and mysql_real_escape_string() works differently and needs 2 arguments. The code in this tutorial is based on mysql and not mysqli, I am new to PHP, so it seems that we need to set up an extension php5-mysql in order to be able to continue. My problem is that I have php 7.2.7 and not sure if this php5-mysql will function

Thanks for the tutorial. I ended up needing to convert mysql to mysqli. Quick question: I’m getting incorrect password every time even though it’s correct in the database. Any help is appreciated.

"dbinfo.php"; session_start(); $username = mysqli_escape_string($link, $_POST['username']); $password = mysqli_escape_string($link, $_POST['password']); $bool = true; $query = mysqli_query($link, "select * from users where username = '$username'"); $exists = mysqli_num_rows($query); $table_users = ""; $table_password = ""; if($exists > 0) < while($row = mysqli_fetch_assoc($query)) < $table_users = $row['username']; $table_password = $row['password']; > if(($username == $table_users) && ($password == $table_password)) < if($password == $table_password) < $_SESSION['user'] = $username; header("location: home.php"); > > else < Print ''; Print ''; > > else < Print ''; Print ''; > ?>

  SSStitle> head> Registration Pageh2> "index.php">Click here to go backa>
 
"register.php" method="post"> Enter Username: "text" name="username" required="required"/> 
Enter Password: "password" name="password" required="required" /> 
"submit" value="Register"/> form> body> html> if($_SERVER["REQUEST_METHOD"] == "POST")< $username = mysql_real_escape_string($_POST['username']); $password = mysql_real_escape_string($_POST['password']); $bool = true; mysql_connect("localhost", "root","") or die(mysql_error()); //Connect to server mysql_select_db("first_db") or die("Cannot connect to database"); //Connect to database $query = mysql_query("Select * from users"); //Query the users table while($row = mysql_fetch_array($query)) //display all rows from query < $table_users = $row['username']; // the first username row is passed on to $table_users, and so on until the query is finished if($username == $table_users) // checks if there are any matching fields < $bool = false; // sets bool to false Print ''; //Prompts the user Print ''; // redirects to register.php > > if($bool) // checks if bool is true < mysql_query("INSERT INTO users (username, password) VALUES ('$username','$password')"); //Inserts the value to table users Print ''; // Prompts the user Print ''; // redirects to register.php > > ?>

Check what php version you are using. mysql is depreciated in php5+. You need to use mysqli instead.

$username = mysql_real_escape_string($_POST['username']); $password = mysql_real_escape_string($_POST['password']);

Will change to (You will also need to include the connection info within the parentheses for mysqli):

$username = mysqli_real_escape_string($conn, $_POST['username']); $password = mysqli_real_escape_string($conn, $_POST['password']);

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Hello World in PHP: A Step-by-Step Guide to Your First Program

PHP is amongst the most widely used programming languages for web development. Since it is an open-source, server-side scripting language with relatively simple architecture, compared to other MVC-based frameworks, it has become a very common language.

A “Hello World” program, as the first program, has become a culture whenever learning a new programming language. Hence, following the footsteps, you will learn how to create a ‘Hello World’ program in PHP to mark the beginning of your journey in PHP.

Prerequisites for PHP Development

You need a certain environment to write PHP scripts. Since PHP is a server-side language, it requires a web server for the script to run. In this article, you will create a local webserver.

For PHP development, you need:

Basics to Advanced — Learn It All!

How to Setup XAMPP Software?

XAMPP is an open source software which stands for:

It is a complete web solutions package. You will be mainly using it for creating a local web server for this tutorial. XAMPP is also used to set up a MySQL database, which you will learn in the later sections.

1. Download and install XAMPP from the official website.

2. After installation, open the XAMPP control panel and start the Apache webserver.

Now, to write the code, you need a code editor.

How to Install Code Editor?

You will use Visual Studio Code as the code editor. You may also download any code editor of your choice. Eg: Atom, Notepad++ etc.

Download the Visual Studio Code from the official website.

Now, have a look at the syntax for writing PHP scripts.

PHP Syntax

A PHP script is very similar to how HTML codes are written. It starts with while the code goes in between.

For every PHP file, the default extension code is «.php».

A PHP file usually contains HTML codes with PHP scripts embedded into them.

Write and Run a “Hello World” Program

Now that you have set up the environment for PHP and learned its syntax let’s move onto creating the Hello World program.

Follow this step-by-step to create your PHP program:

1. Open the directory where XAMPP is installed. By default, XAMPP is installed in the C:\ drive.

2. Open the XAMPP folder and locate a folder named “htdocs” in it.

3. Inside that “htdocs” folder, create a folder and name it anything suiting your project.

Here, it has been named as “demo”.

4. Now open Visual Studio Code and click on “open folder”.

5. Locate to C:\xampp\htdocs and select the “demo” folder you created.

6. Create a file named “index.php” inside the demo folder.

7. Since PHP is embedded into HTML codes, write the following HTML code along with the PHP script.

In the above code, “echo” is used to print the string in front of it.

Basics to Advanced — Learn It All!

8. Save the file and open your web browser and type “localhost” (Since our server is locally hosted) followed by the folder name that you created and hit enter.

9. As you can see, you have got the output for your first PHP program.

Conclusion

This brings us to the conclusion of ‘Hello World’ in PHP article. You have learned how to set up the complete environment for PHP development and how to write and execute your first program in PHP.

Check our next tutorial on the PHP Login form.

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Do you have any questions regarding the article? Please mention it in the comment section of the «Hello World in PHP» article, and we’ll have our experts answer it for you. Happy learning!

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