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<?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));
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
3
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