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<?php $selected=array('11a_Ma1','11a_Sc2','11b_Ls1'); $already=array('11SJP','11a_Ma1','11a_Sc2'); print_r(array_diff($selected,$already));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [2] => 11b_Ls1 )

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