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<?php $foo = array( 'foo' => 'oof' ); $foo['sub']['arrays']['are']['pretty']['cool'] = 0; print_r($foo); ?>
Output for 4.3.0 - 7.1.0
Array ( [foo] => oof [sub] => Array ( [arrays] => Array ( [are] => Array ( [pretty] => Array ( [cool] => 0 ) ) ) ) )