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8 months ago

?? vs isset() with __isset() and __get()

<?php

class A
{
    public function __get($id)
    {
        return 'a value';
    }
}

class B
{
    public function __isset($id)
    {
        return false;
    }
    
    public function __get($id)
    {
        return 'a value';
    }
}

class c
{
    protected $test = "a value";
    
    public function __isset($id)
    {
        return true;
    }
}

$a = new A();
$b = new B();
$c = new C();

echo isset($a->test) ? $a->test : 'nothing'; // "nothing"
echo $a->test ?? 'nothing'; // "a value", isset() is not called!

echo isset($b->test) ? $b->test : 'nothing'; // "nothing"
echo $b->test ?? 'nothing'; // "nothing", __isset() is called

echo isset($c->test) ? $c->test : 'nothing'; // throw an Exception
echo $c->test ?? 'nothing'; // "nothing"

?>
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