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<?php $original = [ '1439045372' => ['price' => 10], '1439131770' => ['price' => 11], '1439218169' => ['price' => 14], '1439304572' => ['price' => 15], '1439390970' => ['price' => 12], ]; $add_to_array = ["3","4","5"]; $n = 1; $result = []; foreach ($original as $key => $item){ $add = $item; if(in_array($n, $add_to_array)){ $add ['data'] = $n; } $result [$key]= $add; $n++; } var_dump($result);
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(5) { [1439045372]=> array(1) { ["price"]=> int(10) } [1439131770]=> array(1) { ["price"]=> int(11) } [1439218169]=> array(2) { ["price"]=> int(14) ["data"]=> int(3) } [1439304572]=> array(2) { ["price"]=> int(15) ["data"]=> int(4) } [1439390970]=> array(2) { ["price"]=> int(12) ["data"]=> int(5) } }

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