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<?php $mainArray = array( 0 =>array( "key1" => array(7,4,5), 'key2' => array('cc','aa') ) ); foreach(&$mainArray as $secondArray){ array_multisort($secondArray); } var_dump($mainArray); ?>
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.23
Parse error: syntax error, unexpected '&' in /in/Ft7ih on line 9
Process exited with code 255.

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