Day 21 and 22 part1 in both of them works part2 is something quite different.

21/input

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+Player 1 starting position: 6
+Player 2 starting position: 4

21/part1.php

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+<?php
+
+$playerA        = ['position' => 6, 'score' => 0];
+$playerB        = ['position' => 4, 'score' => 0];
+$totalDiceRolls = 0;
+while (max([$playerA['score'], $playerB['score']]) < 1000) {
+    $rolls = 0;
+
+    $rolls += ++$totalDiceRolls;
+    $rolls += ++$totalDiceRolls;
+    $rolls += ++$totalDiceRolls;
+
+    $playerScore = ($playerA['position'] + $rolls) % 10;
+    if (($playerA['position'] + $rolls) % 10 === 0) {
+        $playerScore = 10;
+    }
+    $playerA['position'] = $playerScore;
+    $playerA['score']    += $playerScore;
+
+    if ($playerA['score'] >= 1000) {
+        break;
+    }
+    $rolls = 0;
+
+    $rolls += ++$totalDiceRolls;
+    $rolls += ++$totalDiceRolls;
+    $rolls += ++$totalDiceRolls;
+
+    $playerScore = ($playerB['position'] + $rolls) % 10;
+    if (($playerB['position'] + $rolls) % 10 === 0) {
+        $playerScore = 10;
+    }
+    $playerB['position'] = $playerScore;
+    $playerB['score']    += $playerScore;
+
+}
+echo min([$playerA['score'], $playerB['score']]) * $totalDiceRolls; //920580

21/part2.php

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+<?php
+$input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+