http://adventofcode.com/2016

advent1.php

<?php

class Position {

	private $compass;

	private $x;

	private $y;

	public function __construct() {
		$this->compass = Compass::facingNorth();
		$this->x = 0;
		$this->y = 0;
	}

	public function walk($direction, $number_of_blocks) {
		$this->compass->turn($direction);

		$orientation = $this->compass->readOrientation();

		$vertical = [
			Compass::ORI_NORTH,
			Compass::ORI_SOUTH
		];

		$negative = [
			Compass::ORI_SOUTH,
			Compass::ORI_WEST
		];

		$inc = $number_of_blocks;

		if (in_array($orientation, $negative)) {
			$inc = -$inc;
		}

		if (in_array($orientation, $vertical)) {
			$this->y += $inc;
		} else {
			$this->x += $inc;
		}
	}

	public function toString() {
		return sprintf("x: %s, y: %s", $this->x, $this->y);
	}

	public function distanceInBlockFromOrigin() {
		return abs($this->x) + abs($this->y);
	}

}

class Compass {

	const ORI_NORTH = "N";
	const ORI_SOUTH = "S";
	const ORI_EAST = "E";
	const ORI_WEST = "W";

	const DIR_LEFT = "L";
	const DIR_RIGHT = "R";

	private $orientation;

	private function __construct($orientation) {
		$this->orientation = $orientation;
	}

	public function turn($direction) {
		if (is_null($direction)) {
			return;
		}

		$orientation_list = [
			self::ORI_NORTH,
			self::ORI_EAST,
			self::ORI_SOUTH,
			self::ORI_WEST
		];
		$orientation_position = [
			self::ORI_NORTH => 0,
			self::ORI_EAST => 1,
			self::ORI_SOUTH => 2,
			self::ORI_WEST => 3
		];

		$current_pos = $orientation_position[$this->orientation];
		$inc = 1;
		if ($direction == self::DIR_LEFT) {
			$inc = -1;
		}

		$new_pos = $current_pos + $inc;

		if ($new_pos < 0) {
			$new_pos = 3;
		} elseif ($new_pos > 3) {
			$new_pos = 0;
		}

		$this->orientation = $orientation_list[$new_pos];
	}

	public function readOrientation() {
		return $this->orientation;
	}

	public static function facingNorth() {
		return new self(self::ORI_NORTH);
	}

}

$input = explode(", ", "R1, R1, R3, R1, R1, L2, R5, L2, R5, R1, R4, L2, R3, L3, R4, L5, R4, R4, R1, L5, L4, R5, R3, L1, R4, R3, L2, L1, R3, L4, R3, L2, R5, R190, R3, R5, L5, L1, R54, L3, L4, L1, R4, R1, R3, L1, L1, R2, L2, R2, R5, L3, R4, R76, L3, R4, R191, R5, R5, L5, L4, L5, L3, R1, R3, R2, L2, L2, L4, L5, L4, R5, R4, R4, R2, R3, R4, L3, L2, R5, R3, L2, L1, R2, L3, R2, L1, L1, R1, L3, R5, L5, L1, L2, R5, R3, L3, R3, R5, R2, R5, R5, L5, L5, R2, L3, L5, L2, L1, R2, R2, L2, R2, L3, L2, R3, L5, R4, L4, L5, R3, L4, R1, R3, R2, R4, L2, L3, R2, L5, R5, R4, L2, R4, L1, L3, L1, L3, R1, R2, R1, L5, R5, R3, L3, L3, L2, R4, R2, L5, L1, L1, L5, L4, L1, L1, R1");
//$input = ["R8", "R4", "R4", "R8"];
$position = new Position();

$positions = [];

$first_position_visited_twice_found = false;

foreach ($input as $walk) {
	$direction = substr($walk, 0, 1);
	$number = substr($walk, 1);

	for ($i = 0; $i < $number; $i++) {
		$position->walk($direction, 1);

		$direction = null;

		if (!$first_position_visited_twice_found && in_array($position->toString(), $positions)) {
			var_dump($positions);
			echo sprintf('Coordinate of first place visited twice: %s, distance: %s', $position->toString(), $position->distanceInBlockFromOrigin());
			echo "\n";
			$first_position_visited_twice_found = true;
		}

		$positions[] = $position->toString();
	}
}

echo $position->toString();
echo "\n";
echo sprintf("Distance: %s", $position->distanceInBlockFromOrigin());
echo "\n";

advent2.1.php

<?php

$current_pos = 5;

$upper_edges = [1, 2, 3];
$lower_edges = [7, 8, 9];
$left_edges = [1, 4, 7];
$right_edge = [3, 6, 9];

// 1 | 2 | 3
// 4 | 5 | 6
// 7 | 8 | 9

$inc_list = [
	'U' => -3,
	'D' => 3,
	'L' => -1,
	'R' => 1
];

$code = [];

$inputs = explode("\n", "UDRLRRRUULUUDULRULUDRDRURLLDUUDURLUUUDRRRLUUDRUUDDDRRRLRURLLLDDDRDDRUDDULUULDDUDRUUUDLRLLRLDUDUUUUDLDULLLDRLRLRULDDDDDLULURUDURDDLLRDLUDRRULDURDDLUDLLRRUDRUDDDLLURULRDDDRDRRLLUUDDLLLLRLRUULRDRURRRLLLLDULDDLRRRRUDRDULLLDDRRRDLRLRRRLDRULDUDDLDLUULRDDULRDRURRURLDULRUUDUUURDRLDDDURLDURLDUDURRLLLLRDDLDRUURURRRRDRRDLUULLURRDLLLDLDUUUDRDRULULRULUUDDULDUURRLRLRRDULDULDRUUDLLUDLLLLUDDULDLLDLLURLLLRUDRDLRUDLULDLLLUDRLRLUDLDRDURDDULDURLLRRRDUUDLRDDRUUDLUURLDRRRRRLDDUUDRURUDLLLRRULLRLDRUURRRRRLRLLUDDRLUDRRDUDUUUDRUDULRRULRDRRRDDRLUUUDRLLURURRLLDUDRUURDLRURLLRDUDUUDLLLUULLRULRLDLRDDDU
DRRRDRUDRLDUUDLLLRLULLLUURLLRLDRLURDRDRDRLDUUULDRDDLDDDURURUDRUUURDRDURLRLUDRRRDURDRRRDULLRDRRLUUUURLRUULRRDUDDDDUURLDULUDLLLRULUDUURRDUULRRDDURLURRUDRDRLDLRLLULULURLRDLRRRUUURDDUUURDRDRUURUDLULDRDDULLLLLRLRLLUDDLULLUDDLRLRDLDULURDUDULRDDRLUDUUDUDRLLDRRLLDULLRLDURUDRLRRRDULUUUULRRLUDDDLDUUDULLUUURDRLLULRLDLLUUDLLUULUULUDLRRDDRLUUULDDRULDRLURUURDLURDDRULLLLDUDULUDURRDRLDDRRLRURLLRLLLLDURDLUULDLDDLULLLRDRRRDLLLUUDDDLDRRLUUUUUULDRULLLDUDLDLURLDUDULRRRULDLRRDRUUUUUURRDRUURLDDURDUURURULULLURLLLLUURDUDRRLRRLRLRRRRRULLDLLLRURRDULLDLLULLRDUULDUDUDULDURLRDLDRUUURLLDLLUUDURURUD
UDUUUUURUDLLLRRRDRDRUDDRLLDRRLDRLLUURRULUULULRLLRUDDRLDRLUURDUDLURUULLLULLRRRULRLURRDDULLULULRUDDDUURDRLUDUURRRRUUULLRULLLDLURUDLDDLLRRRULDLLUURDRRRDRDURURLRUDLDLURDDRLLLUUDRUULLDLLLLUUDRRURLDDUDULUDLDURDLURUURDUUUURDLLLRUUURDUUUDLDUDDLUDDUDUDUDLDUDUUULDULUURDDLRRRULLUDRRDLUDULDURUURULLLLUDDDLURURLRLRDLRULRLULURRLLRDUDUDRULLRULRUDLURUDLLDUDLRDRLRDURURRULLDDLRLDDRLRDRRDLRDDLLLLDUURRULLRLLDDLDLURLRLLDULRURRRRDULRLRURURRULULDUURRDLURRDDLDLLLRULRLLURLRLLDDLRUDDDULDLDLRLURRULRRLULUDLDUDUDDLLUURDDDLULURRULDRRDDDUUURLLDRDURUDRUDLLDRUD
ULRDULURRDDLULLDDLDDDRLDUURDLLDRRRDLLURDRUDDLDURUDRULRULRULULUULLLLDRLRLDRLLLLLRLRRLRLRRRDDULRRLUDLURLLRLLURDDRRDRUUUDLDLDRRRUDLRUDDRURRDUUUDUUULRLDDRDRDRULRLLDLDDLLRLUDLLLLUURLDLRUDRLRDRDRLRULRDDURRLRUDLRLRLDRUDURLRDLDULLUUULDRLRDDRDUDLLRUDDUDURRRRDLDURRUURDUULLDLRDUDDLUDDDRRRULRLULDRLDDRUURURLRRRURDURDRULLUUDURUDRDRLDLURDDDUDDURUDLRULULURRUULDRLDULRRRRDUULLRRRRLUDLRDDRLRUDLURRRDRDRLLLULLUULRDULRDLDUURRDULLRULRLRRURDDLDLLRUUDLRLDLRUUDLDDLLULDLUURRRLRDULRLRLDRLDUDURRRLLRUUDLUURRDLDDULDLULUUUUDRRULLLLLLUULDRULDLRUDDDRDRDDURUURLURRDLDDRUURULLULUUUDDLRDULDDLULDUDRU
LRLRLRLLLRRLUULDDUUUURDULLLRURLDLDRURRRUUDDDULURDRRDURLRLUDLLULDRULLRRRDUUDDRDRULLDDULLLUURDLRLRUURRRLRDLDUDLLRLLURLRLLLDDDULUDUDRDLRRLUDDLRDDURRDRDUUULLUURURLRRDUURLRDLLUDURLRDRLURUURDRLULLUUUURRDDULDDDRULURUULLUDDDDLRURDLLDRURDUDRRLRLDLRRDDRRDDRUDRDLUDDDLUDLUDLRUDDUDRUDLLRURDLRUULRUURULUURLRDULDLDLLRDRDUDDDULRLDDDRDUDDRRRLRRLLRRRUUURRLDLLDRRDLULUUURUDLULDULLLDLULRLRDLDDDDDDDLRDRDUDLDLRLUDRRDRRDRUURDUDLDDLUDDDDDDRUURURUURLURLDULUDDLDDLRUUUULRDRLUDLDDLLLRLLDRRULULRLRDURRRLDDRDDRLU");

foreach ($inputs as $line) {

	for ($i = 0; $i < strlen($line); $i++) {
		$char = $line[$i];
	
		if ($char == 'U' && in_array($current_pos, $upper_edges)) {
			continue;
		}

		if ($char == 'D' && in_array($current_pos, $lower_edges)) {
			continue;
		}

		if ($char == 'L' && in_array($current_pos, $left_edges)) {
			continue;
		}

		if ($char == 'R' && in_array($current_pos, $right_edge)) {
			continue;
		}

		$inc = $inc_list[$char];
		$current_pos += $inc;
	}

	$code[] = $current_pos;

}

var_dump($code);

advent2.2.php

<?php

class Keypad {

	private $keys = [];

	private function __construct(array $keys) {
		$this->keys = $keys;
	}

	public static function createDiamondShapedKeypad() {
		return new self([
			[null,  null, 1, null,  null],
			[null,   2,   3,   4,   null],
			[   5,   6,   7,   8,   9   ],
			[null,  'A', 'B', 'C',  null],
			[null, null, 'D', null, null]
		]);
	}

	public function move(Position $position, $direction) {
		$new_position = $position->move($direction);

		$x = $new_position->x();
		$y = $new_position->y();

		if ($x < 0 || $y < 0 || $x > 4 || $y > 4) {
			return $position;
		}

		if (is_null($this->keys[$x][$y])) {
			return $position;
		}

		return $new_position;

	}

	public function getAt(Position $position) {
		return $this->keys[$position->x()][$position->y()];
	}

	public function createInitialPosition() {
		return new Position(0, 2);
	}

}

class Position {

	const DIR_UP = "U";
	const DIR_DOWN = "D";
	const DIR_LEFT = "L";
	const DIR_RIGHT = "R";

	private $x;
	private $y;

	public function __construct($x, $y) {
		$this->x = $x;
		$this->y = $y;
	}

	public function move($direction) {
		if (self::DIR_DOWN == $direction) {
			return new static($this->x + 1, $this->y);
		}

		if (self::DIR_UP == $direction) {
			return new static($this->x - 1, $this->y);
		}

		if (self::DIR_LEFT == $direction) {
			return new static($this->x, $this->y - 1);
		}

		if (self::DIR_RIGHT == $direction) {
			return new static($this->x, $this->y + 1);
		}
	}

	public function x() {
		return $this->x;
	}

	public function y() {
		return $this->y;
	}
}

$keypad = Keypad::createDiamondShapedKeypad();
$position = $keypad->createInitialPosition();

$code = [];

$inputs = explode("\n", "UDRLRRRUULUUDULRULUDRDRURLLDUUDURLUUUDRRRLUUDRUUDDDRRRLRURLLLDDDRDDRUDDULUULDDUDRUUUDLRLLRLDUDUUUUDLDULLLDRLRLRULDDDDDLULURUDURDDLLRDLUDRRULDURDDLUDLLRRUDRUDDDLLURULRDDDRDRRLLUUDDLLLLRLRUULRDRURRRLLLLDULDDLRRRRUDRDULLLDDRRRDLRLRRRLDRULDUDDLDLUULRDDULRDRURRURLDULRUUDUUURDRLDDDURLDURLDUDURRLLLLRDDLDRUURURRRRDRRDLUULLURRDLLLDLDUUUDRDRULULRULUUDDULDUURRLRLRRDULDULDRUUDLLUDLLLLUDDULDLLDLLURLLLRUDRDLRUDLULDLLLUDRLRLUDLDRDURDDULDURLLRRRDUUDLRDDRUUDLUURLDRRRRRLDDUUDRURUDLLLRRULLRLDRUURRRRRLRLLUDDRLUDRRDUDUUUDRUDULRRULRDRRRDDRLUUUDRLLURURRLLDUDRUURDLRURLLRDUDUUDLLLUULLRULRLDLRDDDU
DRRRDRUDRLDUUDLLLRLULLLUURLLRLDRLURDRDRDRLDUUULDRDDLDDDURURUDRUUURDRDURLRLUDRRRDURDRRRDULLRDRRLUUUURLRUULRRDUDDDDUURLDULUDLLLRULUDUURRDUULRRDDURLURRUDRDRLDLRLLULULURLRDLRRRUUURDDUUURDRDRUURUDLULDRDDULLLLLRLRLLUDDLULLUDDLRLRDLDULURDUDULRDDRLUDUUDUDRLLDRRLLDULLRLDURUDRLRRRDULUUUULRRLUDDDLDUUDULLUUURDRLLULRLDLLUUDLLUULUULUDLRRDDRLUUULDDRULDRLURUURDLURDDRULLLLDUDULUDURRDRLDDRRLRURLLRLLLLDURDLUULDLDDLULLLRDRRRDLLLUUDDDLDRRLUUUUUULDRULLLDUDLDLURLDUDULRRRULDLRRDRUUUUUURRDRUURLDDURDUURURULULLURLLLLUURDUDRRLRRLRLRRRRRULLDLLLRURRDULLDLLULLRDUULDUDUDULDURLRDLDRUUURLLDLLUUDURURUD
UDUUUUURUDLLLRRRDRDRUDDRLLDRRLDRLLUURRULUULULRLLRUDDRLDRLUURDUDLURUULLLULLRRRULRLURRDDULLULULRUDDDUURDRLUDUURRRRUUULLRULLLDLURUDLDDLLRRRULDLLUURDRRRDRDURURLRUDLDLURDDRLLLUUDRUULLDLLLLUUDRRURLDDUDULUDLDURDLURUURDUUUURDLLLRUUURDUUUDLDUDDLUDDUDUDUDLDUDUUULDULUURDDLRRRULLUDRRDLUDULDURUURULLLLUDDDLURURLRLRDLRULRLULURRLLRDUDUDRULLRULRUDLURUDLLDUDLRDRLRDURURRULLDDLRLDDRLRDRRDLRDDLLLLDUURRULLRLLDDLDLURLRLLDULRURRRRDULRLRURURRULULDUURRDLURRDDLDLLLRULRLLURLRLLDDLRUDDDULDLDLRLURRULRRLULUDLDUDUDDLLUURDDDLULURRULDRRDDDUUURLLDRDURUDRUDLLDRUD
ULRDULURRDDLULLDDLDDDRLDUURDLLDRRRDLLURDRUDDLDURUDRULRULRULULUULLLLDRLRLDRLLLLLRLRRLRLRRRDDULRRLUDLURLLRLLURDDRRDRUUUDLDLDRRRUDLRUDDRURRDUUUDUUULRLDDRDRDRULRLLDLDDLLRLUDLLLLUURLDLRUDRLRDRDRLRULRDDURRLRUDLRLRLDRUDURLRDLDULLUUULDRLRDDRDUDLLRUDDUDURRRRDLDURRUURDUULLDLRDUDDLUDDDRRRULRLULDRLDDRUURURLRRRURDURDRULLUUDURUDRDRLDLURDDDUDDURUDLRULULURRUULDRLDULRRRRDUULLRRRRLUDLRDDRLRUDLURRRDRDRLLLULLUULRDULRDLDUURRDULLRULRLRRURDDLDLLRUUDLRLDLRUUDLDDLLULDLUURRRLRDULRLRLDRLDUDURRRLLRUUDLUURRDLDDULDLULUUUUDRRULLLLLLUULDRULDLRUDDDRDRDDURUURLURRDLDDRUURULLULUUUDDLRDULDDLULDUDRU
LRLRLRLLLRRLUULDDUUUURDULLLRURLDLDRURRRUUDDDULURDRRDURLRLUDLLULDRULLRRRDUUDDRDRULLDDULLLUURDLRLRUURRRLRDLDUDLLRLLURLRLLLDDDULUDUDRDLRRLUDDLRDDURRDRDUUULLUURURLRRDUURLRDLLUDURLRDRLURUURDRLULLUUUURRDDULDDDRULURUULLUDDDDLRURDLLDRURDUDRRLRLDLRRDDRRDDRUDRDLUDDDLUDLUDLRUDDUDRUDLLRURDLRUULRUURULUURLRDULDLDLLRDRDUDDDULRLDDDRDUDDRRRLRRLLRRRUUURRLDLLDRRDLULUUURUDLULDULLLDLULRLRDLDDDDDDDLRDRDUDLDLRLUDRRDRRDRUURDUDLDDLUDDDDDDRUURURUURLURLDULUDDLDDLRUUUULRDRLUDLDDLLLRLLDRRULULRLRDURRRLDDRDDRLU");

foreach ($inputs as $line) {
	for ($i = 0; $i < strlen($line); $i++) {
		$char = $line[$i];

		$position = $keypad->move($position, $char);
	}

	$code[] = $keypad->getAt($position);
}

var_dump($code);

You day 1 and Day2-part 2 ressemble my implementation