Setter Method

A setter method can validate or normalize a value before storing it.

setter_method.php

<?php
class Thermostat
{
    private int $temperature = 70;

    public function setTemperature(int $temperature): void
    {
        $this->temperature = max(50, min(90, $temperature));
    }

    public function temperature(): int
    {
        return $this->temperature;
    }
}

$target = ;
$thermostat = new Thermostat();
$thermostat->setTemperature($target);
$stored = $thermostat->temperature();

echo "target=" . $target . "\n";
echo "stored=" . $stored . "\n";

<?php
class Thermostat
{
    private int $temperature = 70;

    public function setTemperature(int $temperature): void
    {
        $this->temperature = max(50, min(90, $temperature));
    }

    public function temperature(): int
    {
        return $this->temperature;
    }
}

$target = ;
$thermostat = new Thermostat();
$thermostat->setTemperature($target);
$stored = $thermostat->temperature();

echo "target=" . $target . "\n";
echo "stored=" . $stored . "\n";

<?php
class Thermostat
{
    private int $temperature = 70;

    public function setTemperature(int $temperature): void
    {
        $this->temperature = max(50, min(90, $temperature));
    }

    public function temperature(): int
    {
        return $this->temperature;
    }
}

$target = ;
$thermostat = new Thermostat();
$thermostat->setTemperature($target);
$stored = $thermostat->temperature();

echo "target=" . $target . "\n";
echo "stored=" . $stored . "\n";

controlled write Setters keep direct writes out of the public API while still allowing updates.