表显示空值而不是零

Question

我想制作这张表

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!  ID   !   A  !    B   !   C   !   D   !   average   !
-------------------------------------------------------
! 01    !      !    0   !   10  !       !      5      !
! 02    !      !        !       !       !             !
! 03    !   0  !    0   !       !   0   !      0      !

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我使用此功能

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  if ($A == "" ) {$countA="0";} else { $countA = "1"; }
  if ($B == "" ) {$countB="0";} else { $countB = "1"; }
  if ($C == "" ) {$countC="0";} else { $countC = "1"; }
  if ($D == "" ) {$countD="0";} else { $countD = "1"; }
            
$sum		= ($A + $B + $C + $D);
$ceksum =($countA + $countB + $countC + $countD);

		if ($ceksum == "0") {
             $average="";
			} else { $average = $sum/$ceksum; }

and php that i use to call the data is

echo ($averageled4amatt4h=="")?'':round($averageled4amatt4h,1);

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但是该表显示了这个结果..（当零为唯一值时，平均为空数据）

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!  ID   !   A  !    B   !   C   !   D   !   average   !
-------------------------------------------------------
! 01    !      !    0   !   10  !       !      5      !
! 02    !      !        !       !       !             !
! 03    !   0  !    0   !       !   0   !             !

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我该怎么办？我还在学习编码...

Answer 1

试试这个：

if ($ceksum == "0") {
         $average="0"; // <- change this line
        } else { $average = $sum/$ceksum; }

Answer 2

修改此类型的行： if ($A == "" ) {$countA="0";} else { $countA = "1"; }

到

 $countA = !empty($A) ? "1" : 0;
 $countB = !empty($B) ? "1" : 0;
 $countC = !empty($C) ? "1" : 0;