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141.05 ms | 1398 KiB | 7 Q<?php
function diff($this, $that){
$diff = abs(deg2rad($this)-deg2rad($that));
$diff = min((2 * PI) - abs, abs);
echo rad2deg($diff)
.PHP_EOL;
}
diff(-1,1);//2
diff(-90,90);//180
diff(-179,179);//2