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day_3_part_1.php
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<?php
$data = <<<SCHEMATIC
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SCHEMATIC;
$symbols = '*-%$=@#/&+';
$symbol_array = str_split($symbols);
$data = explode(PHP_EOL, $data);
$rows = count($data);
$prev_line = $next_line = [];
$total = 0;
for($row = 0; $row < $rows; $row++) {
$next_line = isset($data[$row + 1]) ? $data[$row + 1] : [];
$line = $data[$row];
$line = str_split($line);
$columns = count($line);
$current_number = '';
$add_number = false;
for($col = 0; $col < $columns; $col++) {
$data_point = $line[$col];
if(is_numeric($data_point)) {
if(!empty($prev_line)) {
$prev_line_cells = [
isset($prev_line[$col - 1])
? $prev_line[$col - 1]
: '.',
$prev_line[$col],
isset($prev_line[$col + 1])
? $prev_line[$col + 1]
: '.'
];
} else {
$prev_line_cells = [];
}
if(!empty($next_line)) {
$next_line_cells = [
isset($next_line[$col - 1])
? $next_line[$col - 1]
: '.',
$next_line[$col],
isset($next_line[$col + 1])
? $next_line[$col + 1]
: '.'
];
} else {
$next_line_cells = [];
}
$surrounding_cells = [
$prev_line_cells,
[isset($line[$col - 1])
? $line[$col - 1]
: '.',
isset($line[$col + 1])
? $line[$col + 1]
: '.'],
$next_line_cells
];
foreach($surrounding_cells as $check_line) {
foreach($check_line as $check_data_point) {
if(in_array($check_data_point, $symbol_array)) {
$add_number = true;
}
}
}
$current_number .= $data_point;
if(!is_numeric($line[$col + 1])) {
if($add_number) {
$total += $current_number;
}
}
} else {
$current_number = '';
$add_number = false;
}
}
$prev_line = $line;
}
echo $total;