PHP - Array unique only using specific values

array_reduce + array_values() solution:

$arr = [ ['id' => 1, 'value' => 111, 'date'=> 'today'], ['id' => 2, 'value' => 222, 'date'=> 'today'], ['id' => 3, 'value' => 333, 'date'=> 'today'], ['id' => 1, 'value' => 111, 'date'=> 'today'], ['id' => 5, 'value' => 111, 'date'=> 'today'] ]; $result = array_values( array_reduce($arr, function($r, $a){ if (!isset($r[$a['value'] . $a['date']])) $r[$a['value'] . $a['date']] = $a; return $r; }, []) ); print_r($result); 

The output:

Array ( [0] => Array ( [id] => 1 [value] => 111 [date] => today ) [1] => Array ( [id] => 2 [value] => 222 [date] => today ) [2] => Array ( [id] => 3 [value] => 333 [date] => today ) ) 

Iterate over your array and get a key as concatenation of 'date' and 'value' fields. If this key has already been found - skip array value:

$pairs = []; $new_values = []; foreach ($array as $item) { $key = $item['date'] . $item['value']; if (empty($pairs[$key])) { $pairs[$key] = 1; $new_values[] = $item; } }