Simple Currency Converter in PHP using OOP Approach

Submitted by: 
nurhodelta_17
Language: 
PHP
Visitors have accessed this post 655 times.

Getting Started

To improve the visual of this tutorial, I've used CDN for Bootstrap so you need internet connection for it to work.

Creating our Class

First, we are going to create our class and we're going to name this as Converter.php.

  1. <?php
  2.  
  3. class Converter{
  4.  
  5. 	private $rateValue;
  6.  
  7. 	//I have base these rates on USD :)
  8. 	private $rates = [
  9. 		'USD' => 1.0,
  10. 		'GBP' => 0.7,
  11. 		'EUR' => 0.800284,
  12. 		'YEN' => 109.67,
  13. 		'CAN' => 1.23,
  14. 		'PHP' => 51.74,
  15. 	];
  16.  
  17. 	public function setConvert($amount, $currency_from){
  18. 		$this->rateValue = $amount/$this->rates[$currency_from];
  19. 	}
  20.  
  21. 	public function getConvert($currency_to){
  22.                 return round($this->rates[$currency_to] * $this->rateValue, 2);
  23. 	}
  24.  
  25. 	public function getRates(){
  26. 		return $this->rates;
  27. 	}
  28. }
  29.  
  30. ?>

In this class we have define our array of rates and the different methods.

Creating our Convert Form

Next step is to create our form that converts our set amount from one currency to another.

  1. <?php
  2.  
  3. session_start();
  4.  
  5. include_once('Converter.php');
  6.  
  7. $converter = new Converter();
  8.  
  9. $rates = $converter->getRates();
  10.  
  11. ?>
  12. <!DOCTYPE html>
  13. <html>
  14. <head>
  15. 	<title>Simple Currency Converter in PHP using OOP Approach</title>
  16. 	<link href="<a href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"" rel="nofollow">https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"</a> rel="stylesheet">
  17. </head>
  18. <body>
  19. <div class="container">
  20. 	<h1 class="page-header text-center">Simple Currency Converter in PHP using OOP Approach</h1>
  21. 	<div class="row">
  22. 		<div class="col-sm-4 col-sm-offset-4">
  23. 			<form method="POST" action="getconvert.php">
  24. 				<div class="form-group">
  25. 					<label>Amount:</label>
  26. 					<input type="text" class="form-control" name="amount">
  27. 				</div>
  28. 				<div class="form-group">
  29. 					<label>From:</label>
  30. 					<select class="form-control" name="currency_from">
  31. 						<?php
  32. 							foreach ($rates as $key => $currency){
  33. 								?>
  34. 								<option value="<?php echo $key; ?>"><?php echo $key ?></option>
  35. 								<?php
  36. 							}
  37.  
  38. 						?>
  39. 					</select>
  40. 				</div>
  41. 				<div class="form-group">
  42. 					<label>To:</label>
  43. 					<select class="form-control" name="currency_to">
  44. 						<?php
  45. 							foreach ($rates as $key => $currency){
  46. 								?>
  47. 								<option value="<?php echo $key; ?>"><?php echo $key ?></option>
  48. 								<?php
  49. 							}
  50.  
  51. 						?>
  52. 					</select>
  53. 				</div>
  54. 				<button type="submit" name="convert" class="btn btn-primary">Convert</button>
  55. 			</form>
  56.  
  57. 			<?php
  58. 				if(isset($_SESSION['value'])){
  59. 					?>
  60. 					<div class="alert alert-info text-center" style="margin-top:20px;">
  61. 						<?php 
  62. 							echo $_SESSION['value']['amount'].' '.$_SESSION['value']['from'].' is equal to '.$_SESSION['value']['result'].' '.$_SESSION['value']['to']; 
  63. 						?>
  64. 					</div>
  65. 					<?php
  66. 					unset($_SESSION['value']);
  67. 				}
  68. 			?>
  69. 		</div>
  70. 	</div>
  71. </div>
  72. </body>
  73. </html>

In here, we fetch our rates and we put them as options in our select tag.

Creating our Convert Action

Lastly, we create our PHP code to convert the amount.

  1. <?php
  2.  
  3. session_start();
  4.  
  5. require_once('Converter.php');
  6.  
  7. if(isset($_POST['convert'])){
  8. 	$amount = $_POST['amount'];
  9. 	$currency_from = $_POST['currency_from'];
  10. 	$currency_to = $_POST['currency_to'];
  11.  
  12. 	$converter = new Converter();
  13. 	$converter->setConvert($amount, $currency_from);
  14. 	$result = $converter->getConvert($currency_to);
  15.  
  16. 	$out = array();
  17. 	$out['amount'] = $amount;
  18. 	$out['from'] = $currency_from;
  19. 	$out['result'] = $result;
  20. 	$out['to'] = $currency_to;
  21.  
  22. 	$_SESSION['value'] = $out;
  23. 	header('location:index.php');
  24.  
  25. }
  26. else{
  27. 	header('location:index.php');
  28. }
  29.  
  30. ?>

That ends this tutorial. Happy coding :)

  • 655 reads
Tags: 
php
OOP
object-oriented
currency
currency converter
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Article by nurhodelta_17

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