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<?php class foo { public $field1; public $field2; public $field3; } $foo = new foo(); $foo->field1 = 2; var_dump($foo); $field1 = 'field1'; var_dump(isset($foo->$field1));
Output for git.master, git.master_jit, rfc.property-hooks
object(foo)#1 (3) { ["field1"]=> int(2) ["field2"]=> NULL ["field3"]=> NULL } bool(true)

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