How to merge multiple arrays in codeigniter?

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$array1 = array('a', 'b', 'c');
$array2 = array('d', 'e', 'f');
$array3 = array('g', 'h', 'i');

$merged_array = array_merge($array1, $array2, $array3);

print_r($merged_array);

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Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
    [4] => e
    [5] => f
    [6] => g
    [7] => h
    [8] => i
)

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$merged_array = $array1 + $array2 + $array3;

print_r($merged_array);