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Write a program to calculate electricity bill in PHP

YasminRadwan26
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2022-05-14
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Write a program to calculate electricity bill in PHP

In this exercise, you will learn a PHP program to calculate an electricity bill based on some conditions using if-else statements. The electricity consumption charge is easy to understand and calculate. It is measured in kWh (kilowatt hours). The rate of electricity bill varies depending on the geographic location and the amount of consumption. Suppose we have the following conditions for rates of electricity calculation -

  • First 1 to 100 units – Rs. 8/unit
  • Next 100 to 200 units – Rs. 12/unit
  • Next 200 to 300 units – Rs. 16/unit
  • above 300 units – Rs. 20/unit
Php programming,
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YasminRadwan26
2022-05-14
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The following program is the implementation of the above methodology -

<!DOCTYPE html>
<html>
<head>
	<title>Program to calculate electricity bill in PHP</title>
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
	<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>
	<?php
	$amount = '';
	$kwh_usage = '';
	if (isset($_POST['submit'])) {
		$units = $_POST['kwh'];
		if (!empty($units)) {
			$kwh_usage = calculate_electricity_bill($units);
			$amount = '<strong>Total amount of ' . $units . ' units -</strong> ' . $kwh_usage;
		}
	}
	/**
	 * To calculate electricity bill as per unit cost
	 */
	function calculate_electricity_bill($units) {
		$first_unit_cost = 8;
		$second_unit_cost = 12;
		$third_unit_cost = 16;
		$fourth_unit_cost = 20;

		if($units <= 100) {
			$bill = $units * $first_unit_cost;
		}
		else if($units > 100 && $units <= 200) {
			$temp = 100 * $first_unit_cost;
			$remaining_units = $units - 100;
			$bill = $temp + ($remaining_units * $second_unit_cost);
		}
		else if($units > 200 && $units <= 300) {
			$temp = (100 * $first_unit_cost) + (100 * $second_unit_cost);
			$remaining_units = $units - 200;
			$bill = $temp + ($remaining_units * $third_unit_cost);
		}
		else {
			$temp = (100 * $first_unit_cost) + (100 * $second_unit_cost) + (100 * $third_unit_cost);
			$remaining_units = $units - 300;
			$bill = $temp + ($remaining_units * $fourth_unit_cost);
		}
		return number_format((float)$bill, 2, '.', '');
	}
	?>
	<div class="container">
		<h1>Calculate electricity bill in PHP</h1>
		<div class="form-group">
		<form action="" method="post">
		<div class="form-group">
			<input type="number" name="kwh" placeholder="Please enter no. of Units" class="form-control" />
		</div>
		<div class="form-group">		
			<input type="submit" name="submit" class="btn btn-primary" value="Submit" />
		</div>	
		</form>
		</div>
		<div>
		    <?php echo '<br />' . $amount; ?>
		</div>
	</div>
</body>
</html>

Here is the sample execution of the above program.

Calculate electricity bill in PHP

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