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@ 2016-05-12T10:18:27Z

<?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);

$dist = acos($dist);

var_dump($dist);

$dist = 1;
$dist = acos($dist);
var_dump($dist);

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

55.77 ms | 402 KiB | 5 Q