find the surface area of a cylinder in php

To find the surface area of a cylinder in PHP, we can use the formula:

main.php
<?php

function cylinderSurfaceArea($r, $h) {
  $baseArea = 2 * pi() * $r * $r;
  $sideArea = 2 * pi() * $r * $h;
  $surfaceArea = $baseArea + $sideArea;

  return $surfaceArea;
}

// Example usage
echo cylinderSurfaceArea(3, 5); // Outputs: 124.139
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In the above code, we define a function cylinderSurfaceArea() that takes in the radius r and the height h of the cylinder as parameters.

We then calculate the area of the base of the cylinder using the formula 2 * pi * r * r and the area of the side of the cylinder using the formula 2 * pi * r * h. We add these two areas together to get the total surface area of the cylinder.

Finally, we return the surface area value from the function.

We can then call the function and pass in the values of r and h to get the surface area of the cylinder. In this example, calling cylinderSurfaceArea(3, 5) will output 124.139.