Turn string into integer in PHP

Question

I have two classes communicating. One of them returns a getter with the month typed in the form, and the other class receives this getter within the cal_days_in_month() function. The problem is that the month field of this function only accepts integer, and as the information comes from a getter it comes as string, would anyone know of any solution?

Follows the class that receives the form data. Receives.php:

<?php

class RecebeDados
{
    private $mes, $ano, $feriado, $beneficio, $date;

    public function __construct()
    {
        $this->date = new DateTime('now', new DateTimeZone('America/Sao_Paulo'));
    }

    public function recebeForm($dados)
    {
        $this->mes = $dados['mes'];
        $this->ano = $dados['ano'];
        $this->feriado = $dados['feriado'];
        $this->beneficio = $dados['beneficio'];
    }

    public function getMes()
    {   
        return $this->mes;
    }

    public function getAno()
    {
        return $this->ano;
    }

    public function getFeriado()
    {
        return $this->feriado;
    }

    public function getBeneficio()
    {
        return $this->beneficio;
    }
}

$recebe = new RecebeDados();
$recebe->recebeForm($_POST);

require_once 'CalculaBeneficio.php';

$calcBeneficio = new CalculaBeneficio();
$calcBeneficio->calcDias();
$calcBeneficio->calcBeneficio();

The class that uses this data. Calculates.php:

<?php

require_once 'RecebeDados.php';

class CalculaBeneficio extends RecebeDados
{
    public $diasUteis, $totalDiasMes, $result, $recebeDados;

    public function __construct()
    {
        $this->recebeDados = new RecebeDados();
    }

    public function calcDias()
    {
        $this->diasUteis = 0;

            // Obtém o número de dias no mês 
        $this->totalDiasMes = cal_days_in_month(CAL_GREGORIAN, $this->recebeDados->getMes(), $this->recebeDados->getAno()); 

        for($dia = 1; $dia <= $this->totalDiasMes; $dia++) {

            // Verifica os dias úteis do mês (seg a sex)
        $timeStamp = mktime(0, 0, 0, $this->recebeDados->getMes(), $this->recebeDados->getDia(), $this->recebeDados->getAno());
        $diaSemana = date("N", $timeStamp);

        if ($diaSemana < 6) $this->diasUteis++;

        }

        return $this->diasUteis;

        }

    public function calcBeneficio()
    {
            //  Faz calculo para retirar os feriados
        $this->result = $this->totalDiasMes - $this->recebeDados->getFeriado();

            //  Calcula o beneficio
        return $this->result *= $this->recebeDados->getBeneficio();

        header('Location: ../index.php');
    }
}

The error you make when I fill in the form is:

Warning: cal_days_in_month(): invalid date. 

This is because in the documentation it says that fields should be integer, and they are coming as getters string.

There is another topic regarding converting string to integer: Convert string number to PHP integer

But the solutions in this topic did not solve my problem.

Grateful!

Answer 1

You can do it by making a casting using the modifiers int or integer:

$string = '100';
$int = (int) $string;

Or using the function intval:

$string = '100';
$int = intval($string); 

Answer 2

You’ll need to change your code a little bit:

To make it work use these lines:

require_once 'CalculaBeneficio.php';

$calcBeneficio = new CalculaBeneficio($_POST);
$calcBeneficio->calcDias();
$calcBeneficio->calcBeneficio();

In the construct class CalculaBeneficio:

public function __construct($data)
{
    parent::__construct($data);
}

In class CalculaBeneficio where you have $this->recebeDados you delete the received, example:

$this->recebeDados->getMes(); // Antigo
$this->getMes(); // Novo

In the class builder RecebeDados:

public function __construct($data)
{
    $this->date = new DateTime('now', new DateTimeZone('America/Sao_Paulo'));
    $this->mes = $data['mes'];
    $this->ano = $data['ano'];
    $this->feriado = $data['feriado'];
    $this->beneficio = $data['beneficio'];
}

Here you can read more about inheritance in PHP.