# Write a program to calculate Electricity bill in PHP

Description:

You need to write a PHP program to calculate electricity bill using if-else conditions.

Conditions:

• For first 50 units – Rs. 3.50/unit
• For next 100 units – Rs. 4.00/unit
• For next 100 units – Rs. 5.20/unit
• For units above 250 – Rs. 6.50/unit
• You can use conditional statements.

View Solution/Program

``````<!DOCTYPE html>

<title>PHP - Calculate Electricity Bill</title>

<?php
\$result_str = \$result = '';
if (isset(\$_POST['unit-submit'])) {
\$units = \$_POST['units'];
if (!empty(\$units)) {
\$result = calculate_bill(\$units);
\$result_str = 'Total amount of ' . \$units . ' - ' . \$result;
}
}
/**
* To calculate electricity bill as per unit cost
*/
function calculate_bill(\$units) {
\$unit_cost_first = 3.50;
\$unit_cost_second = 4.00;
\$unit_cost_third = 5.20;
\$unit_cost_fourth = 6.50;

if(\$units <= 50) {
\$bill = \$units * \$unit_cost_first;
}
else if(\$units > 50 && \$units <= 100) {
\$temp = 50 * \$unit_cost_first;
\$remaining_units = \$units - 50;
\$bill = \$temp + (\$remaining_units * \$unit_cost_second);
}
else if(\$units > 100 && \$units <= 200) {
\$temp = (50 * 3.5) + (100 * \$unit_cost_second);
\$remaining_units = \$units - 150;
\$bill = \$temp + (\$remaining_units * \$unit_cost_third);
}
else {
\$temp = (50 * 3.5) + (100 * \$unit_cost_second) + (100 * \$unit_cost_third);
\$remaining_units = \$units - 250;
\$bill = \$temp + (\$remaining_units * \$unit_cost_fourth);
}
return number_format((float)\$bill, 2, '.', '');
}

?>

<body>
<div id="page-wrap">
<h1>Php - Calculate Electricity Bill</h1>

<form action="" method="post" id="quiz-form">
<input type="number" name="units" id="units" placeholder="Please enter no. of Units" />
<input type="submit" name="unit-submit" id="unit-submit" value="Submit" />
</form>

<div>
<?php echo '<br />' . \$result_str; ?>
</div>
</div>
</body>
</html>``````
Tutorials Class - Output Window