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run code in 150+ php & hhvm versions
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<?php function flatten($inputArray) { $output = ''; foreach ($inputArray as $element) { if (is_array($element) == true) { $output .= flatten($element); }else { $output .= $element; } } return $output;}$print = array( 'orange', 'green', array( 'yellow', 'white' ));echo flatten($print);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
orangegreenyellowwhite