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@ 2014-09-17T22:49:48Z

<?php
function diff($t, $o){
	$t = deg2rad($t);
	$o = deg2rad($o);
	if($t<0)$t += M_PI_2;
	if($o<0)$o += M_PI_2;
	$diff = abs($t-$o
);
	$diff = min( M_PI_2 - $diff, $diff);
	echo rad2deg($diff)
.PHP_EOL;
}

diff(-1,1);//2
diff(-90,90);//180
diff(-179,179);//2

Output
Performance
VLD
References
Branches

abs: documentation ( source)
rad2deg: documentation ( source)
min: documentation ( source)
deg2rad: documentation ( source)

preferences:dark modelive preview

38.64 ms | 402 KiB | 5 Q