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<?php $base = ['one' => 10]; $arr1 = ['one' => 1, 'two' => 2]; $arr2 = ['three' => 3]; var_dump(array_merge($arr1, $arr2, $base)); var_dump(array_diff_assoc(array_merge($arr1, $arr2), $base));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["one"]=> int(10) ["two"]=> int(2) ["three"]=> int(3) } array(3) { ["one"]=> int(1) ["two"]=> int(2) ["three"]=> int(3) }

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