find the volume of a cone in php

main.php
function cone_volume($r, $h) {
  // Calculate the volume using the formula
  $volume = 1/3 * pi() * pow($r, 2) * $h;
  
  // Return the volume
  return $volume;
}
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main.php
$r = 5; // Radius of the base
$h = 10; // Height of the cone

$volume = cone_volume($r, $h); // Calculate the volume

echo "The volume of the cone is " . $volume; // Output the result
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main.php
The volume of the cone is 261.79938779915
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