13 lines
394 B
PHP
13 lines
394 B
PHP
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<?php
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$lines = array_filter(explode("\n", file_get_contents('./input.txt')), fn($line) => !empty($line));
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echo array_sum(array_map(
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static function($line) {
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$numbers = array_values(array_filter(array_map(static fn($letter) => is_numeric($letter) ? $letter : null, str_split($line))));
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return (int) sprintf('%s%s', $numbers[0], array_pop($numbers));
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},
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$lines
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));
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