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140.86 ms | 1399 KiB | 7 Q<?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 $diff.PHP_EOL;
}
diff(359,1);//2
diff(-90,90);
//180