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@ 2016-05-12T10:30:00Z

<?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

$dist = acos(min(max($dist,-1.0),1.0)); 
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)
max: documentation ( source)
min: documentation ( source)
deg2rad: documentation ( source)

preferences:dark modelive preview

29.24 ms | 410 KiB | 5 Q