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<?php |
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namespace DrMVC\Helpers; |
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/** |
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* Simple GeoPosition class based on below answer |
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* @link http://stackoverflow.com/a/17286519/7977798 |
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* @package DrMVC\Helpers |
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*/ |
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class Geo |
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{ |
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/** |
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* Generate array of random coordinates for tests |
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* |
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* @param int $count Count of results |
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* @param int $radius In kilometers |
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* @return array |
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*/ |
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public static function randomCoordinates($count = 1, $radius = 100): array |
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{ |
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$result = []; |
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// If count is set |
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for ($i = 0; $i < $count; $i++) { |
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// Random angle (from 0 bad idea) |
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$angle = deg2rad(mt_rand(1, 359)); |
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// Random radius (from 0 bad idea) |
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$pointRadius = mt_rand(1, $radius); |
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// Result array |
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$result[] = [ |
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// Latitude |
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sin($angle) * $pointRadius, |
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// Longitude |
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cos($angle) * $pointRadius |
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]; |
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} |
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return $result; |
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} |
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/** |
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* The length of an arc of a unit circle is numerically equal to |
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* the measurement in radians of the angle that it subtends. |
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* |
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* @link https://en.wikipedia.org/wiki/Radian |
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* @param string $degree - The number needed to calculate radians |
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* @return float|int |
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*/ |
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public static function radians($degree) |
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{ |
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return $degree * M_PI / 180; |
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} |
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/** |
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* Return array of coordinates within some radius |
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* |
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* @param array $coordinates - Multidimensional array of coordinates [[latitude,longitude],[latitude,longitude],[latitude,longitude]] |
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* @param array $center - Simple array with coordinates [latitude,longitude] |
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* @param string $radius - In kilometers or meters (1 - km, .1 - 100 meters) |
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* @return array - Simple array with LAT,LON coordinates which are within the radius |
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*/ |
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public static function getCoordinatesWithinRadius($coordinates, $center, $radius) |
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{ |
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$resultArray = []; |
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list($lat1, $long1) = $center; |
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foreach ($coordinates as $key => $value) { |
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list($lat2, $long2) = $value; |
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$distance = 3959 * acos(cos(self::radians($lat1)) * cos(self::radians($lat2)) * cos(self::radians($long2) - self::radians($long1)) + sin(self::radians($lat1)) * sin(self::radians($lat2))); |
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if ($distance < $radius) { |
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$resultArray[$key] = $value; |
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} |
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} |
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return $resultArray; |
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} |
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} |
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drmvc /
helpers
