<?php $a1 = Array ( '01-1970' => 0.00, '03-2019' => 4350.00, '05-2019' => 150.00, '06-2019' => 50.00 ); $a2 = Array ( '03-2019' => 0.00, '04-2019' => 0.00, '06-2019' => 34.83 ); $r = []; $keys = array_keys($a1+$a2); foreach($keys as $v){ $r[$v] = (empty($a1[$v]) ? 0 : $a1[$v]) + (empty($a2[$v]) ? 0 : $a2[$v]); } print_r($r);
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