Online PHP editor | output for X7Vnl

<?php $itinerary = array (array('portName'=>'Day At Sea'), array('portName'=>'Moscow'), array('portName'=>'Jupiter')); $badPorts = array('At Sea', 'Day At Sea', 'Cruising The Mediterranean Sea'); $image = ''; $arr = array(); array_walk($itinerary, function($item, $index) use($badPorts, &$arr){ if(!in_array($item['portName'], $badPorts)) $arr[] = $index.":".$item['portName']; }); $image .= implode(',', $arr); var_dump($image); $image2 = ''; $arr2 = array(); foreach($itinerary as $index => $item){ if(!in_array($item['portName'], $badPorts)) $arr2[] = $index.":".$item['portName']; } $image2 .= implode(',', $arr2); var_dump($image2); $index = 0; $image3 = implode(',', array_reduce($itinerary, function ($result, $item) use($badPorts, &$index) { if(!in_array($item['portName'], $badPorts)) $result[] = $index.":".$item['portName']; return $result; }, array())); var_dump($image3); $image4 = implode(',', array_filter ($itinerary, function($item){ if(!in_array($item['portName'], $badPorts)) return true; return false })); var_dump($image4);