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<?php var_dump($display['tbl_p'] && !empty($tbl_p[0]['RoSkusInCheckoutStore']) ? 'a' : 'b');
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: display in /in/fRdEO on line 3 string(1) "b"
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: display in /in/fRdEO on line 3 string(1) "b"