public static final function decode($string)
{
$points = array();
$index = $i = 0;
$previous = array(0, 0);
while ($i < strlen($string)) {
$shift = $result = 0x0;
do {
$bit = ord(substr($string, $i++)) - 63;
$result |= ($bit & 0x1f) << $shift;
$shift += 5;
} while ($bit >= 0x20);
$diff = $result & 1 ? ~($result >> 1) : $result >> 1;
$number = $previous[$index % 2] + $diff;
$previous[$index % 2] = $number;
$index++;
$points[] = $number * 1 / pow(10, static::$precision);
}
return $points;
} /**
* Test rounding issues report by issue #10
*
* @return NULL
*/
public function testRounding()
{
$originalPoints = array(48.000006, 2.000004, 48.00001, 2.0);
$encoded = Polyline::encode($originalPoints);
$this->assertEquals('a_~cH_seK??', $encoded);
$decodedPoints = Polyline::decode($encoded);
$this->assertTrue($decodedPoints[0] === $decodedPoints[2]);
$this->assertTrue($decodedPoints[1] === $decodedPoints[3]);
}