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<?php class Coalescing { protected $attributes = [ 'attribute1' => 'value1', ]; public function __get($name) { print "GET\n"; if (array_key_exists($name, $this->attributes)) { return $this->attributes[$name]; } trigger_error("Property $name does not exist"); return null; } public function __isset($name) { print "ISSET\n"; return array_key_exists($name, $this->attributes); } } $coal = new Coalescing(); var_dump($coal->attribute1 ?? 'default'); var_dump($coal->attribute2 ?? 'default');
Output for 7.0.6 - 7.2.0
ISSET GET string(6) "value1" ISSET string(7) "default"
Output for 7.0.0 - 7.0.5
GET string(6) "value1" GET Notice: Property attribute2 does not exist in /in/QgN2g on line 16 string(7) "default"
Output for 5.5.0 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/QgN2g on line 30
Process exited with code 255.