Online PHP editor | refs for 6ci8h

<?php $array = [ (object)[ 'label' => 'Test 1', 'session' => 2 ], (object)[ 'label' => 'Test 2', 'session' => 2 ], (object)[ 'label' => 'Test 3', 'session' => 42 ], (object)[ 'label' => 'Test 4', 'session' => 9 ] ]; $result = array_map(function($x){ return $x->session; }, $array); echo count(array_unique($result));