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run code in 150+ php & hhvm versions
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<?php function func(&$a){ $a->prop='new value'; } $a=new stdClass(); $a->prop='value'; print_r($a); func($a); print_r($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
stdClass Object ( [prop] => value ) stdClass Object ( [prop] => new value )