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<?php error_reporting(E_ALL); function setDefault(&$variable, $default) { if (!isset($variable)) { $variable = $default; } } $foo = array( 'foo' => 'oof' ); setDefault($foo['bar']['uuu'], 'rab'); print_r($foo); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [foo] => oof [bar] => Array ( [uuu] => rab ) )