4 snakes and ladders

compile xdebug from source cause `pecl install xdebug` wont work anymore
setup snakes and ladders kata with first unit test

kata/SnakesAndLadders/SnakesLadders.php

@@ -6,13 +6,63 @@
 
 final class SnakesLadders
 {
+    const MAP = [
+        2 => 38, 7 => 14, 8 => 31,
+        15 => 26, 16 => 6,
+        21 => 42, 28 => 84,
+        36 => 44,
+        46 => 25, 49 => 11,
+        51 => 67,
+        62 => 19, 64 => 60,
+        71 => 91, 74 => 53, 78 => 98,
+        87 => 94, 89 => 68,
+        92 => 88, 95 => 75, 99 => 80,
+
+        // implicit snakes in case player goes over 100
+        101 => 80, 102 => 98, 103 => 97, 104 => 96, 105 => 75, 106 => 94,
+        107 => 93, 108 => 88, 109 => 91, 110 => 90, 111 => 68,
+    ];
+
+    private $currentPlayer = 1;
+
+    private $playerPosition = [
+        1 => 0,
+        2 => 0,
+    ];
+
+    /**
+     * Initializes the game.
+     */
     public function __construct()
     {
-
     }
 
+    /**
+     * The turn of the current player is executed.
+     */
     public function play(int $die1, int $die2): string
     {
-        return '';
+        // in case one player has already won, don't execute another turn
+        if (in_array(100, $this->playerPosition, true)) {
+            return 'Game over!';
+        }
+
+        // move the player token
+        $newPosition = $this->playerPosition[$this->currentPlayer] + $die1 + $die2;
+        $finalPosition = self::MAP[$newPosition] ?? $newPosition;
+
+        // report the result string
+        $result = ($newPosition === 100)
+            ? 'Player ' . $this->currentPlayer . ' Wins!'
+            : 'Player ' . $this->currentPlayer . ' is on square ' . $finalPosition;
+
+        $this->playerPosition[$this->currentPlayer] = $finalPosition;
+
+        // if the current player rolled a double, it's his turn again, else switch players
+        $this->currentPlayer = ($die1 === $die2)
+            ? $this->currentPlayer
+            : $this->currentPlayer ^ 3;
+
+        return $result;
     }
 }

kata/SnakesAndLadders/SnakesLaddersTest.php

@@ -22,13 +22,28 @@ public function testPlay(array $expectedOutput, array $diceThrows)
 
     public function providePlay(): Generator
     {
-        yield 'Player 1 just throws 1 & 1' => [
+        yield 'player 1 just throws 1 & 1' => [
             [
                 'Player 1 is on square 38',
             ],
             [
                 [1, 1],
             ]
         ];
+
+        yield 'simple game with 4 turns' => [
+            [
+                'Player 1 is on square 38',
+                'Player 1 is on square 44',
+                'Player 2 is on square 31',
+                'Player 1 is on square 25',
+            ],
+            [
+                [1, 1],
+                [1, 5],
+                [6, 2],
+                [1, 1],
+            ]
+        ];
     }
 }