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<?php class Dummy { public string $prop; public function __set($name, $value) { echo "Property '$name' in undeclared!\n"; $this->$name = $value; } } $dummy = new Dummy; $dummy->prop = 'Hello'; $dummy->prop .= ' world'; echo "{$dummy->prop}\n"; unset($dummy->prop); $dummy->prop = 'Hello'; $dummy->prop .= ' world'; echo "{$dummy->prop}\n";
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.33, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9
Hello world Property 'prop' in undeclared! Hello world

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