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<?php function anon() { static $i = 0; return eval(sprintf('return new class { public $prop%s; };', ++$i)); } $c1 = anon(); $c1->prop1 = 'hello'; $c2 = anon(); var_dump($c1, $c2, $c1->prop1, $c1->prop2);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined property: class@anonymous::$prop2 in /in/Eq3Di on line 13 object(class@anonymous)#1 (1) { ["prop1"]=> string(5) "hello" } object(class@anonymous)#2 (1) { ["prop2"]=> NULL } string(5) "hello" NULL

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