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<?php class Coordinate { /** @var float $latitudeRadians */ protected $latitudeRadians; /** @var float $longitudeRadians */ protected $longitudeRadians; /** * Constructor. * * @param float $latitudeRadians * @param float $latitudeRadians */ public function __construct( float $latitudeRadians, float $longitudeRadians ) { $this->latitudeRadians = $latitudeRadians; $this->longitudeRadians = $longitudeRadians; } /** * Create a Coordinate object from latitude and longitude given in degrees. * * @param float $latitudeDegrees * @param float $longitudeDegrees * * @return static */ public static function fromDegrees(float $latitudeDegrees, float $longitudeDegrees) { return new static( $latitudeDegrees * M_PI / 180, $longitudeDegrees * M_PI / 180 ); } /** * Get the coordinate's latitude, measured in degrees. * * @return float */ public function latitudeDegrees() : float { return $this->latitudeRadians * 180 / M_PI; } /** * Get the coordinate's latitude, measured in radians. * * @return float */ public function latitudeRadians() : float { return $this->latitudeRadians; } /** * Get the coordinate's longitude, measured in degrees. * * @return float */ public function longitudeDegrees() : float { return $this->longitudeRadians * 180 / M_PI; } /** * Get the coordinate's longitude, measured in radians. * * @return float */ public function longitudeRadians() : float { return $this->longitudeRadians; } /** * Is this coordinate equivalent to another? * * @param static $other * * @return bool */ public function equals(self $other) : bool { return $this->latitudeRadians() === $other->latitudeRadians() && $this->longitudeRadians() === $other->longitudeRadians() ; } /** * Calculate the distance between this and another coordinate, in kilometers. * * @param static $other * * @return float */ public function distanceKilometers(self $other) : float { // Haversine formula for great-circle distance. $earthRadiusKilometers = 6371; $deltaLatitudeRadians = $this->latitudeRadians() - $other->latitudeRadians(); $deltaLongitudeRadians = $this->longitudeRadians() - $other->longitudeRadians(); $a = sin($deltaLatitudeRadians / 2) ** 2 + cos($this->latitudeRadians()) * cos($other->latitudeRadians()) * sin($deltaLongitudeRadians / 2) ** 2 ; $c = 2 * asin(sqrt($a)); return $c * $earthRadiusKilometers; } } $latitudeWorkDegrees = 40.981123; $longitudeWorkDegrees = -74.121752; $latitudeHomeDegrees = 41.184084; $longitudeHomeDegrees = -74.555852; $latitudeWorkRadians = deg2rad($latitudeWorkDegrees); $longitudeWorkRadians = deg2rad($longitudeWorkDegrees); $latitudeHomeRadians = deg2rad($latitudeHomeDegrees); $longitudeHomeRadians = deg2rad($longitudeHomeDegrees); $coordinateWork = new Coordinate($latitudeWorkRadians, $longitudeWorkRadians); $coordinateHome = new Coordinate($latitudeHomeRadians, $longitudeHomeRadians); $distance = $coordinateWork->distanceKilometers($coordinateHome); echo $distance;