- property_exists: documentation ( source)
- var_dump: documentation ( source)
<?php
class A{
public string $x;
}
$A = new A;
var_dump(property_exists($A,'x'));//true
var_dump($A); //class A#1 (1) {} // - it counts the property, but hides it
var_dump(new stdClass()); //class stdClass#1 (0) {} - empty object