public function coordinate_switch($a,$b){//百度轉騰訊坐標轉換

$x = (double)$b - 0.0065;

$y = (double)$a - 0.006;

$x_pi = 3.14159265358979324;

$z = sqrt($x * $x+$y * $y) - 0.00002 * sin($y * $x_pi);

$theta = atan2($y,$x) - 0.000003 * cos($x*$x_pi);

$gb = number_format($z * cos($theta),15);

$ga = number_format($z * sin($theta),15);

return [‘Latitude‘=>$ga,‘Longitude‘=>$gb];

}

public function coordinate_switchf($a,$b){//騰訊轉百度坐標轉換

$x = (double)$b ;

$y = (double)$a;

$x_pi = 3.14159265358979324;

$z = sqrt($x * $x+$y * $y) + 0.00002 * sin($y * $x_pi);

$theta = atan2($y,$x) + 0.000003 * cos($x*$x_pi);

$gb = number_format($z * cos($theta) + 0.0065,6);

$ga = number_format($z * sin($theta) + 0.006,6);

return [‘Latitude‘=>$ga,‘Longitude‘=>$gb];

}

原文：http://www.cnblogs.com/ylqs/p/7286387.html