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<?php

class Row
{

    private array $values;

    public function __construct(array $array)
    {

        $this->values = $array;
    }
    public function getSize()
    {

        return sizeof($this->values);
    }
    public function getValues()
    {

        return $this->values;
    }
}

class Table
{

    private Row $header;
    private array $rows;

    public  function __construct(Row $header)
    {

        $this->header = $header;
    }
    public function addRow(Row $row): Table
    {
        if ($this->header->getSize() == $row->getSize())
            $this->rows[] = $row;

        return $this;
    }
    public function switchRow(int $cellFirst, int $cellLast): Table
    {

        $temp = $this->rows[$cellFirst];
        $this->rows[$cellFirst] = $this->rows[$cellLast];
        $this->rows[$cellLast] = $temp;
        return  $this;
    }
    public function toHtml(): string
    {

        $string = '<table><thead>';


        foreach ($this->header->getValues() as $cell)

            $string .= "<td>$cell</td>";

        $string .= "</thead><tbody>";

        foreach ($this->rows as $row) {
            $string .= "<tr>";
            foreach ($row->getValues() as $cell) {
                $string .= "<td>$cell</td>";
            }
            $string .= "</tr>";
        }
        $string .= "</tbody></table>";

        return $string;
    }
}


$table=new Table(new Row(['name','family','age']));

$table->addRow(new Row(['mohammad','mohammdi',24]))->addRow(new Row(['ahmad','ahmadi',20]));

$table->switchRow(0, 1);
echo ($table->toHtml());