Online PHP editor | refs for B8Gh7

<?php $songs = [ ['Michael Jackson' => 'Thriller'], ['Michael Jackson' => 'Rock With You'], ['Teddy Pendergrass' => 'Love TKO'], ['ACDC' => 'Back in Black'] ]; $result = array_merge_recursive(...$songs); var_export($result); echo "\n---\n"; $template = <<<HTML <h2>%s</h2> <ul> <li>%s</li> </ul> HTML; foreach ($result as $artist => $songs) { printf( $template, $artist, implode('</li><li>', (array)$songs) ); }