check 9 numbers

sudokochecker.php

#!/usr/bin/env php -f

<?php

$sudoko [] = [1, 8, 2, 5, 4, 3, 6, 9, 7];
$sudoko [] = [9, 6, 5, 1, 7, 8, 3, 4, 2];
$sudoko [] = [7, 4, 3, 9, 6, 2, 8, 1, 5];

function isValidSudoko($sudoko)
{
    $sudLine = 0;
    $sudCol  = 0;

    foreach ($sudoko as $line) {

        $numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9];
        $sudLine++;

        if (count($line) == 9) {
            foreach ($line as $number) {
                $sudCol++;
                $index = array_search($number, $numbers); // need the index of the item, in_array doesnt work returns only bool

                if ($index === false) {
                    throw new Exception("Sudoko is not valid. => " . $sudLine . "/" . $sudCol);
                }

                unset($numbers[$index]); // unset the item if found
            }
        } else {
            throw new Exception("Sudoko is not valid. => " . $sudLine . "/" . $sudCol);
        }

        $sudCol = 0;

    }

    echo "Sudoko is valid." . PHP_EOL;
    return true;
}

isValidSudoko($sudoko);

?>