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comma operator v/s binary op

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Why can't the comma operator be used?  I get the warning I get in the first construct but don't understand the complete fail on the second.



   while ($pending_row || @( ($row_l = $sth_l->fetch(PDO::FETCH_OBJ)) | ($row_u = $sth_u->fetch(PDO::FETCH_OBJ) ))){

   while ($pending_row || @( ($row_l = $sth_l->fetch(PDO::FETCH_OBJ)) , ($row_u = $sth_u->fetch(PDO::FETCH_OBJ) ))){
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