Online PHP editor | output for 6HC6Y

<?php $yesterdayArray = array ( 'project-id' => array ( 373482 => array ( 'responsible-ids' => array ( 129938 => array ( 0 => array ( 'task-id' => 1812, 'content' => 'HU-003-FRONT', 'progress' => 100, 'completed_On' => '2020-10-23', 'created_On' => '2020-10-14', 'responsible-ids' => 129938, 'responsible-name' => 'MaloM.' ), ), ), ), ), ); foreach ($yesterdayArray['project-id'] as $pid => $array) { foreach ($array['responsible-ids'] as $key => $rid) { echo $key . PHP_EOL; } } foreach ($yesterdayArray['project-id'] as $pid => $array) { print_r(array_keys($array['responsible-ids'])); }