Online PHP editor | refs for OibBS

<?php $fake_db_results = [ ['session_id' => 1, 'page_url' => 'http://a.com'], ['session_id' => 1, 'page_url' => 'http://b.com'], ['session_id' => 1, 'page_url' => 'http://c.com'], ['session_id' => 2, 'page_url' => 'http://d.com'], ['session_id' => 2, 'page_url' => 'http://e.com'], ['session_id' => 3, 'page_url' => 'http://f.com'], ['session_id' => 4, 'page_url' => 'http://g.com'], ['session_id' => 5, 'page_url' => 'http://h.com'] ]; $paths = []; foreach ($fake_db_results as $row) { if ( ! array_key_exists($row['session_id'], $paths) || ! is_array($paths[$row['session_id']])) { $paths[$row['session_id']] = []; } array_push($paths[$row['session_id']], $row['page_url']); } echo '<pre>'; var_dump($paths); $html = ''; foreach ($paths as $session => $page) { $html .= "<tr>\n"; $html .= '<td>' . $session . "</td>\n"; $html .= '<td>' . implode('| ', $page) . "</td>\n"; $html .= "</tr>\n"; } echo $html;