<?php $arr = ['a' => 1, 'b' => 2]; $arr += ['a' => 3] + ['b' => 4]; print_r(['a' => 3] + ['b' => 4]); print_r($arr); $arr = ['a' => 1, 'b' => 2]; print_r(array_merge($arr, ['a' => 3], ['b' => 4]));
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