A two array data structure implementation in PHP, version 1

کد

<?php

namespace Techanic\CS\DS\Linear\Vector;

use Exception;

abstract class AbstractTwoDimArray
{
    /**
     *
     * @var array
     */
    private /*array*/ $_size = [0, 0];

    /**
     *
     * @var array
     */
    private /*array*/ $_values = [];

    protected abstract function getValueType() : string;
    protected abstract function getDefaultValue();

    public function __construct(int $rows, int $cols)
    {
        if ($rows < 0)
            throw new Exception('rows must be positive number.');
        if ($cols < 0)
            throw new Exception('cols must be positive number.');
        $this->_size = [$rows, $cols];
        $defaultValue = $this->getDefaultValue();
        if (gettype($defaultValue) != $this->getValueType())
            throw new Exception('Return type of the getDefaultValue() does not match getValueType().');
        for ($row = 0; $row < $this->_size[0]; $row++) {
            for ($col = 0; $col < $this->_size[1]; $col++)
                $this->_values[$row][$col] = $defaultValue;
        }
    }

    public function Size(): array
    {
        return $this->_size;
    }

    public function Set(int $row, int $col, $value)
    {
        if ($row < 0 || $row >= $this->_size[0])
            throw new Exception('The row index must be in the range (0, ' . ($this->_size[0] -1) . ')');
        if ($col < 0 || $col >= $this->_size[1])
            throw new Exception('The col index must be in the range (0, ' . ($this->_size[1] -1) . ')');
        if (gettype($value) != $this->getValueType())
            throw new Exception('The value must be of type ' . $this->getValueType());
        $this->_values[$row][$col] = $value;
    }

    public function Get(int $row, int $col)
    {
        if ($row < 0 || $row >= $this->_size[0])
            throw new Exception('The row index must be in the range (0, ' . ($this->_size[0] -1) . ')');
        if ($col < 0 || $col >= $this->_size[1])
            throw new Exception('The col index must be in the range (0, ' . ($this->_size[1] -1) . ')');
        return $this->_values[$row][$col];
    }
}

class IntTwoDimArray extends AbstractTwoDimArray
{
    protected function getValueType() : string
    {
        return gettype(0);
    }

    protected function getDefaultValue()
    {
        return 0;
    }
}

$rows = 5;
$cols = 5;
$intMatrix = new IntTwoDimArray($rows, $cols);
for ($row = 0; $row < $intMatrix->Size()[0]; $row++) {
    for ($col = 0; $col < $intMatrix->Size()[1]; $col++)
        echo $intMatrix->Get($row, $col) . ' ';
    echo PHP_EOL;
}
echo PHP_EOL;
for ($row = 0; $row < $intMatrix->Size()[0]; $row++) {
    for ($col = 0; $col < $intMatrix->Size()[1]; $col++)
        $intMatrix->Set($row, $col, $row + $col);
}
for ($row = 0; $row < $intMatrix->Size()[0]; $row++) {
    for ($col = 0; $col < $intMatrix->Size()[1]; $col++)
        echo $intMatrix->Get($row, $col) . ' ';
    echo PHP_EOL;
}
echo PHP_EOL;