遍历foreach并创建数组

Question

我试图遍历属性数据库中的唯一区域数组，然后为每个区域的大小，值和建筑物大小创建一个数组。

我的问题是我可以创建数组，但是由于循环的每个foreach都具有相同的名称，因此数组的总和不仅是该区域中的数量，还包括先前循环通过的区域的数量。

例如：A区应合计100 B区应合计200

但是代码正在返回：A区总计100 B区总计300（100 + 200）

问题可能在于数组$ Value，$ ResSQFT和$ ComSQFT在每个foreach循环中最终具有相同的名称，但是我知道如何动态重命名它们。

$Zones = "SELECT DISTINCT(ZONING_COD) FROM `ClevelandParcels`" ;

$ZonesStatus = mysqli_query($Connection, $Zones) ;
if(!$ZonesStatus)
{
  die('Could not get data: ' . mysqli_error());
}
while($row = mysqli_fetch_array($ZonesStatus))
{

$UniqueZones[] = array($row['ZONING_COD']);

}

echo "Zone,ParcelCount,ParcelValue,BuilingSqft,ResLivableArea,ComLeaseableArea<br>";

foreach ( $UniqueZones as $varZ ) {
  $ZoneParcelCount = "SELECT COUNT(*) FROM `ClevelandParcels` WHERE ZONING_COD =     '".$varZ[0]."'" ;
  $ZoneParcelCountStatus = mysqli_query($Connection, $ZoneParcelCount) ;
  $total = mysqli_fetch_row($ZoneParcelCountStatus);

  echo $varZ[0].",".$total[0];
mysqli_free_result($ZoneParcelCountStatus);

  $ZoneParcels = "SELECT * FROM `ClevelandParcels` WHERE ZONING_COD =     '".$varZ[0]."'" ;
  $ZoneParcelsStatus = mysqli_query($Connection, $ZoneParcels) ;
  if(!$ZoneParcelsStatus)
{
  die('Could not get data: ' . mysqli_error());
}

while ($row = mysqli_fetch_assoc($ZoneParcelsStatus)){
  $Value[] = $row['GROSS_CE_2'];
  $ResSqft[] = $row['TOTAL_RES_'];
  $ComSqft[] = $row['TOTAL_COM_'];
  }
    echo ",        $".array_sum($Value).",".array_sum($ResSqft).",".array_sum($ComSqft)."<br>";
    mysqli_free_result($ZoneParcelsStatus);

}

Answer 1

您必须先重置数组，然后才能在其中添加数据并计算总和：

$Value=[];
$ResSqft=[];
$ComSqft=[];
while ($row = mysqli_fetch_assoc($ZoneParcelsStatus)){
    $Value[] = $row['GROSS_CE_2'];
    $ResSqft[] = $row['TOTAL_RES_'];
    $ComSqft[] = $row['TOTAL_COM_'];
}

在您的代码中，每次在每个数组中附加值，因此将累加您的值。

Answer 2

$Zones = "SELECT DISTINCT(ZONING_COD) FROM `ClevelandParcels`" ;

$ZonesStatus = mysqli_query($Connection, $Zones) ;
if(!$ZonesStatus)
{
  die('Could not get data: ' . mysqli_error());
}
while($row = mysqli_fetch_array($ZonesStatus))
{

$UniqueZones[] = array($row['ZONING_COD']);

}

echo "Zone,ParcelCount,ParcelValue,BuilingSqft,ResLivableArea,ComLeaseableArea<br>";

foreach ( $UniqueZones as $varZ ) {
  $ZoneParcelCount = "SELECT COUNT(*) FROM `ClevelandParcels` WHERE ZONING_COD = '".$varZ[0]."'" ;
  $ZoneParcelCountStatus = mysqli_query($Connection, $ZoneParcelCount) ;
  $total = mysqli_fetch_row($ZoneParcelCountStatus);

  echo $varZ[0].",".$total[0];
mysqli_free_result($ZoneParcelCountStatus);

  $ZoneParcels = "SELECT * FROM `ClevelandParcels` WHERE ZONING_COD = '".$varZ[0]."'" ;
  $ZoneParcelsStatus = mysqli_query($Connection, $ZoneParcels) ;
  if(!$ZoneParcelsStatus)
{
  die('Could not get data: ' . mysqli_error());
}
unset($Value);
unset($ResSqft);
unset($ComSqft);
while ($row = mysqli_fetch_assoc($ZoneParcelsStatus)){
  $Value[] = $row['GROSS_CE_2'];
  $ResSqft[] = $row['TOTAL_RES_'];
  $ComSqft[] = $row['TOTAL_COM_'];
  }
    echo ", $".array_sum($Value).",".array_sum($ResSqft).",".array_sum($ComSqft)."<br>";
    mysqli_free_result($ZoneParcelsStatus);

}