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1.1 misho 1: $unset_var = 10; 2: unset($unset_var); 3: 4: $variation_array = array( 5: 'unset var' => @$unset_var, 6: 'undefined var' => @$undefined_var, 7: 'empty string DQ' => "", 8: 'empty string SQ' => '', 9: 'uppercase NULL' => NULL, 10: 'lowercase null' => null, 11: );