//百度转腾讯坐标转换
function coordinate_b2t($a,$b){
   $x = (double)$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($theta),15);
   return ['lat'=>$ga,'lon'=>$gb];
}

//腾讯转百度坐标转换
function coordinate_t2b($a,$b){
   $x = (double)$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($theta) + 0.006,6);
   return ['lat'=>$ga,'lon'=>$gb];
}