<?php

declare(strict_types=1);

\$input = <<<\'PHP\'
MMMSXXMASM
MSAMXMSMSA
AMXSXMAAMM
MSAMASMSMX
XMASAMXAMM
XXAMMXXAMA
SMSMSASXSS
SAXAMASAAA
MAMMMXMMMM
MXMXAXMASX
PHP;

\$grid = array_map(
    static fn (string \$row): array => mb_str_split(\$row),
    explode(\"\\n\", \$input),
);

\$found = 0;

foreach (\$grid as \$y => \$row) \{
    foreach (\$row as \$x => \$character) \{
        if (\$character === \'A\') \{
            if (\$grid[\$y - 1][\$x - 1] === \'M\' && \$grid[\$y + 1][\$x + 1] === \'S\' && \$grid[\$y - 1][\$x + 1] === \'S\' && \$grid[\$y + 1][\$x - 1] === \'M\') \{
                \$found++;
            \}

            if (\$grid[\$y - 1][\$x - 1] === \'S\' && \$grid[\$y + 1][\$x + 1] === \'M\' && \$grid[\$y - 1][\$x + 1] === \'M\' && \$grid[\$y + 1][\$x - 1] === \'S\') \{
                \$found++;
            \}

            if (\$grid[\$y - 1][\$x - 1] === \'S\' && \$grid[\$y + 1][\$x + 1] === \'M\' && \$grid[\$y - 1][\$x + 1] === \'S\' && \$grid[\$y + 1][\$x - 1] === \'M\') \{
                \$found++;
            \}

            if (\$grid[\$y - 1][\$x - 1] === \'M\' && \$grid[\$y + 1][\$x + 1] === \'S\' && \$grid[\$y - 1][\$x + 1] === \'M\' && \$grid[\$y + 1][\$x - 1] === \'S\') \{
                \$found++;
            \}
        \}
    \}
\}

return \$found;