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<?php $array1 = [[12 => 'new q sets'], [11 => 'common set']]; $array2 = [[11 => 'common set']]; var_export(array_diff_assoc($array1, $array2));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Array to string conversion in /in/jIUcq on line 6 Warning: Array to string conversion in /in/jIUcq on line 6 array ( 1 => array ( 11 => 'common set', ), )

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