PHP Strict Type Checking (code to accompany https://youtu.be/a6qZfbL-upA)

example1.php

<?php

$value = 10;
$value = "Hello";
$value = 3.14;

$number = 5;
$text = "10";

$result = $number + $text;

echo $result;

example2.php

<?php 

declare(strict_types=1);

function toggleSetting(bool $enabled): void {

    echo $enabled ? "Setting enabled<br>" : "Setting disabled<br>";
    
}

toggleSetting(true);
toggleSetting(false);
toggleSetting(1);
toggleSetting(0);
toggleSetting(-1);
toggleSetting("false");

example3.php

<?php

declare(strict_types=1);

use App\SettingsManager;

require "src/SettingsManager.php";

$manager = new SettingsManager;

$manager->setLevel(3);
$manager->setLevel("5");
$manager->setLevel(true);

SettingsManager.php

<?php

declare(strict_types=1);

namespace App;

class SettingsManager
{
    public function setLevel(int $level): void {
    
        echo "Set level to $level<br>";
    
    }   
}