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这是一个非常有用的距离计算函数,利用纬度和经度计算从 A 地点到 B 地点的距离。该函数可以返回英里,公里,海里三种单位类型的距离。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | function distance( $lat1 , $lon1 , $lat2 , $lon2 , $unit ) { $theta = $lon1 - $lon2 ; $dist = sin( deg2rad ( $lat1 )) * sin( deg2rad ( $lat2 )) + cos ( deg2rad ( $lat1 )) * cos ( deg2rad ( $lat2 )) * cos ( deg2rad ( $theta )); $dist = acos ( $dist ); $dist = rad2deg( $dist ); $miles = $dist * 60 * 1.1515; $unit = strtoupper ( $unit ); if ( $unit == "K" ) { return ( $miles * 1.609344); } else if ( $unit == "N" ) { return ( $miles * 0.8684); } else { return $miles ; } } //用法: echo distance(32.9697, -96.80322, 29.46786, -98.53506, "k" ). " kilometers" ; |