Write a program to calculate electricity bill in PHP

Here, you will learn a simple PHP program to calculate an electricity bill based on some conditions using the 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

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.

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Write a program to calculate electricity bill in PHP

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