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<?php
 
$currentValues = [1, 2];
$newValues = [1, 3, 1, 4, 2];
print_r(array_merge($currentValues, array_diff($newValues, $currentValues)));

Success #stdin #stdout 0.02s 24400KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
)

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PHP (php 7.3.5)

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