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run code in 200+ php & hhvm versions
Bugs & Features
<?php function &getBar() { static $bar = null; if ($bar === null) { $bar[] = 'init'; } return $bar; } $array = &getBar(); $arary[] = 123; // var_dump(getBar());
based on TAmfA
Output for 4.3.0 - 7.2.0
array(1) { [0]=> string(4) "init" }