Skip to main content

Dynamically Change Font Size Using PHP Source Code

In this tutorial we will create a Dynamically Change Font Size using PHP. This code can will change the font size of a text when user submit a form. The code use PHP GET method to send and receive the request in order to change the given text size. This is a user-friendly kind of program feel free to modify it.

We will be using PHP as a scripting language and interpreter that is used primarily on any webserver including xamp, wamp, etc. It is being use to any famous websites and it has a modern technology that can easily be use by the next generation.

Getting Started:

First you have to download & install XAMPP or any local server that run PHP scripts. Here's the link for XAMPP server

And, this is the link for the bootstrap that i used for the layout design

Creating The Interface

This is where we will create a simple form for our application. To create the forms simply copy and write it into your text editor, then save it as index.php.

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <meta charset="utf-8" name="viewport" content="width=device-width, initial-scale=1"/>
  5. <link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
  6. </head>
  7. <body>
  8. <nav class="navbar navbar-default">
  9. <div class=container-fluid>
  10. <a class="navbar-brand" href="">Sourcecodester</a>
  11. </div>
  12. </nav>
  13. <div class="col-md-3"></div>
  14. <div class="col-md-6 well">
  15. <h3 class="text-primary">Dynamically Change Font Size Using PHP Source Code</h3>
  16. <hr style="border-top:1px dotted #000;"/>
  17. <div class="col-md-5">
  18. <form method="GET" action="">
  19. <div class="form-group">
  20. <h3>Type a String</h3>
  21. <h6 class='text-danger'>Word must be in UPPER or LOWER CASE</h6>
  22. <input type="text" name="word" class="form-control"/>
  23. </div>
  24. <button type="submit" class="btn btn-primary">Convert</button>
  25. <br /><br />
  27. <?php include'change.php'?>
  28. </form>
  29. </div>
  30. </body>
  31. </html>

Creating the Main Function

This code contains the main function of the application. This code change the font size when the button is clicked. To make this just copy and write these block of codes below inside the text editor, then save it as change.php.

  1. <?php
  2. if(ISSET($_GET['word']) && !empty($_GET['word'])){
  3. if(ctype_lower($_GET['word'])){
  4. $word=$_GET['word'];
  5. $upper_word=strtoupper($word);
  6. echo "<h2 class='text-info'>".$upper_word."</h2>";
  7. }else if(ctype_upper($_GET['word'])){
  8. $word=$_GET['word'];
  9. $lower_word=strtolower($word);
  10. echo "<h2 class='text-info'>".$lower_word."</h2>";
  11. }
  12. }
  13. ?>

There you have it we successfully created Dynamically Change Font Size using PHP. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

Note: Due to the size or complexity of this submission, the author has submitted it as a .zip file to shorten your download time. After downloading it, you will need a program like Winzip to decompress it.

Virus note: All files are scanned once-a-day by for viruses, but new viruses come out every day, so no prevention program can catch 100% of them.


1. Re-scan downloaded files using your personal virus checker before using it.
2. NEVER, EVER run compiled files (.exe's, .ocx's, .dll's etc.)--only run source code.

Add new comment

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.