Online PHP editor | vld for ZQIZ5

@ 2014-09-17T22:22:40Z

<?php
function diff($this, $that){
	$diff = deg2rad($this)-deg2rad($that);
        while($diff < -M_PI) $diff += M_PI_2;
        while($diff > M_PI) $diff -= M_PI_2;
	echo rad2deg($diff)
.PHP_EOL;
}

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

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