<?php $array1 = [ '1' => '11', 'b' => 1, 3 => 33, 8 => 8 ]; $array2 = [ '1' => '22', 'b' => 2, 3 => 44, 9 => 9 ]; foreach ($array2 as $key => $value) { if (!key_exists($key, $array1)) { $array1[$key] = $value; } else { $array1[$key] = (array)$array1[$key]; $array1[$key][] = $value; } } var_export($array1);
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Value for `_results` contains invalid data `array`