subtract.php

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<?php

namespace Matrix;

use Matrix\Operators\Subtraction;

if (!function_exists(__NAMESPACE__ . '\\subtract')) {
    function subtract(...$matrixValues): Matrix
    {
        if (count($matrixValues) < 2) {
            throw new Exception('Subtraction operation requires at least 2 arguments');
        }

        $matrix = array_shift($matrixValues);

        if (is_array($matrix)) {
            $matrix = new Matrix($matrix);
        }
        if (!$matrix instanceof Matrix) {
            throw new Exception('Subtraction arguments must be Matrix or array');
        }

        $result = new Subtraction($matrix);

        foreach ($matrixValues as $matrix) {
            $result->execute($matrix);
        }

        return $result->result();
    }
}