Online PHP editor | refs for nVPGt

<?php $cars = array ( 0 => (object)(array( 'id' => 1, 'title' => 'Golf', 'manufacturer' => 1 )), 1 => (object)(array( 'id' => 2, 'title' => 'Focus', 'manufacturer' => 2 )), 2 => (object)(array( 'id' => 3, 'title' => 'Jazz', 'manufacturer' => null )), 3 => (object)(array( 'id' => 4, 'title' => 'Passat', 'manufacturer' => 1 )), 4 => (object)(array( 'id' => 5, 'title' => 'Toureg', 'manufacturer' => 1 )), 5 => (object)(array( 'id' => 6, 'title' => 'Galaxy', 'manufacturer' => 2 )), 6 => (object)(array( 'id' => 7, 'title' => 'Falcon', 'manufacturer' => null )), 7 => (object)(array( 'id' => 8, 'title' => 'Commodore', 'manufacturer' => null )), 8 => (object)(array( 'id' => 9, 'title' => 'Phoenix', 'manufacturer' => 3 )), 9 => (object)(array( 'id' => 10, 'title' => 'Cressida', 'manufacturer' => null )) ); // sort based on manufacturer usort($cars, function ($a, $b) { if (!$a->manufacturer) { // if both null, sort by id if (!$b->manufacturer) return $a->id - $b->id; // otherwise sort null values last return 1; } if (!$b->manufacturer) // sort null values last return -1; return $a->manufacturer - $b->manufacturer; }); $lastmfg = 0; foreach ($cars as $car) { if (!$car->manufacturer || $car->manufacturer != $lastmfg) { if ($lastmfg !== 0) echo "</div>\n"; echo '<div class="container'. ($car->manufacturer ? ' id' . $car->manufacturer : '') .'">'. "\n"; } echo 'ID: ' . $car->id . ' - ' . $car->title . "\n"; $lastmfg = $car->manufacturer; } echo "</div>\n";