3v4l.org

run code in 300+ PHP versions simultaneously

sponsor
bughunt
search
recent
about

@ 2016-05-12T10:19:49Z

<?php

$lat1 = 35.697959;
$lat2 = 35.697959;
$lon1 = 139.707085;
$lon2 = 139.707085;
$theta = $lon1 - $lon2;
$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +  cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
var_dump($dist); // returns 1

$dist = acos($dist); 
var_dump($dist); // returns NAN

$x = 1;
$x = acos($x);
var_dump($x);  // doesn't return NAN

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
sin: documentation ( source)
cos: documentation ( source)
acos: documentation ( source)
deg2rad: documentation ( source)

preferences:dark modelive preview

26.92 ms | 402 KiB | 5 Q