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<?php function calculateAccuracy($txPower, $rssi){ if ($rssi == 0) { return -1.0; // if we cannot determine accuracy, return -1. } $ratio = $rssi*1.0/$txPower; if ($ratio < 1.0) { return pow($ratio,10); } else { $accuracy = (0.89976)*pow($ratio,7.7095) + 0.111; return $accuracy; } } echo(calculateAccuracy(-10, -70).PHP_EOL); echo(calculateAccuracy(-20, -70).PHP_EOL); echo(calculateAccuracy(-40, -70).PHP_EOL); echo(calculateAccuracy(-60, -70).PHP_EOL); echo(calculateAccuracy(-80, -70).PHP_EOL); echo(calculateAccuracy(-90, -70).PHP_EOL); echo(calculateAccuracy(-100, -70).PHP_EOL);