78 lines
2.5 KiB
PHP
78 lines
2.5 KiB
PHP
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<?php
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const MODE_POSITION = 0;
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const MODE_IMMEDIATE = 1;
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$input = explode(',', file_get_contents('input.txt'));
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function debug($message)
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{
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echo $message."\n";
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}
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function run_opcode(array $input, $first_input = 1)
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{
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$i = 0;
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$output = 0;
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do {
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[$instruction, $first, $second, $position] = array_slice($input, $i, 4);
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$instruction = str_pad($instruction, 5, '0', STR_PAD_LEFT);
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$operation = (int) substr($instruction, -2);
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$modes = array_map('intval', str_split(strrev(substr($instruction, 0, 3))));
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$first = (int) ($modes[0] === MODE_IMMEDIATE ? $first : $input[$first]);
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$second = (int) ($modes[1] === MODE_IMMEDIATE ? $second : $input[$second]);
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switch ($operation) {
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case 1:
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$input[$position] = $first + $second;
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debug(sprintf('Operation 1 : putting %s + %s = %s in position %s', $first, $second, ($first + $second), $position));
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$i += 4;
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break;
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case 2:
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$input[$position] = $first * $second;
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debug(sprintf('Operation 1 : putting %s * %s = %s in position %s', $first, $second, ($first * $second), $position));
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$i += 4;
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break;
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case 3:
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$input[$input[$i+1]] = $first_input;
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debug(sprintf('Operation 3 : putting %s in position %s', $first_input, $input[$i + 1]));
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$i += 2;
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break;
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case 4:
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$output = $input[$input[$i+1]];
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debug(sprintf('Operation 4 : Outputting %s', $output));
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$i += 2;
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break;
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case 5:
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if ($first != 0) {
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$i = $second;
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} else {
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$i += 3;
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}
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break;
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case 6:
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if ($first == 0) {
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$i = $second;
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} else {
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$i += 3;
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}
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break;
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case 7:
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$input[$position] = $first < $second ? 1 : 0;
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$i += 4;
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break;
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case 8:
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$input[$position] = $first == $second ? 1 : 0;
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$i += 4;
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break;
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case 99:
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return $output;
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exit;
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default:
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echo 'unknown operation : ' . $operation . '('.$i.')';
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exit;
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}
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} while ($input[$i] !== 99);
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return $output;
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}
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