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<?php $longitude = (float) -2.708077; $latitude = (float) 53.754842; $radius = 20; // in miles $lng_min = $longitude - $radius / abs(cos(deg2rad($latitude)) * 69); $lng_max = $longitude + $radius / abs(cos(deg2rad($latitude)) * 69); $lat_min = $latitude - ($radius / 69); $lat_max = $latitude + ($radius / 69); echo 'lng (min/max): ' . $lng_min . '/' . $lng_max . PHP_EOL; echo 'lat (min/max): ' . $lat_min . '/' . $lat_max;
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