advent_of_code_2021/day_8/part_1.php

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<?php
$output = array_map(static function ($line) {
return explode('|', $line)[1];
}, explode("\n", file_get_contents('./input.txt')));
echo array_reduce($output, static function($carry, $item) {
$count = 0;
$items = explode(' ', $item);
foreach ($items as $item) {
$count += in_array(strlen($item), [2, 4, 3, 7]) ? 1 : 0;
}
$carry += $count;
return $carry;
});