好吧,我知道使用 eval() 不是很好,但我一直没能想出更好的解决方案来解决我的问题,直到最近,没有性能原因不使用它。但是,我现在将足够多的数据传递给函数,它花费的时间长得令人无法接受。
被调用的函数是:
public static function makeAMultiDimensionalArrayWithSumsBasedOnMultipleFields($inArray, $dimensionFieldNames, $sumFieldNameArray, $staticFieldNameArray = array())
{
$outArray = array();
// Just in case the array has indices, sort it so array_pop works as expected.
ksort($dimensionFieldNames);
foreach ($inArray as $row)
{
// make sure each row in the inArray has all keys specified by $dimensionFieldNames
$allFieldsPresent = TRUE;
foreach ($dimensionFieldNames as $keyFieldName)
{
if (!array_key_exists($keyFieldName, $row))
{
// Note that alternatively we could set the field to a specified default value.
$allFieldsPresent = FALSE;
}
}
if ($allFieldsPresent)
{
$indexString = '';
$keyFieldNameArrayCopy = $dimensionFieldNames;
foreach ($dimensionFieldNames as $keyFieldName)
{
$indexString .= "['" . $row[$keyFieldName] . "']";
// lets sum values
foreach ($sumFieldNameArray as $sumFieldName)
{
eval ('$outArray' . $indexString . '[' . $sumFieldName . '] += $row[' . $sumFieldName . '];');
}
foreach ($staticFieldNameArray as $staticFieldName)
{
eval ('$outArray' . $indexString . '[' . $staticFieldName . '] = $row[' . $staticFieldName . '];');
}
}
}
}
return $outArray;
}
它是这样调用的:
makeAMultiDimensionalArrayWithSumsBasedOnMultipleFields($data, $dimensionArray, $sumArray, $staticArray);
传递给函数的变量类似于:
$dimensionArray = array("firstLevelID", "secondLevelID", "thirdLevelID", "fourthLevelID", "fifthLevelID");
$sumArray = array("revenue", "cost", "profit", "sales", "inquires", "cost", "walkins");
$staticArray = array("date", "storeID", "storeName", "productID", "productName", "managerID", "managerName", "salesperson");
所以我想重写这个函数,这样我就不再使用 eval() 了。我已经在这方面花费了大量时间,觉得是时候寻求一些建议了。
目标是获取一个数组数组,并根据 $dimensionArray 中的维度将其转换为多维数组。
我现在不想让你厌烦太多细节,所以如果你需要更多或有任何其他问题,请询问
最佳答案
哇,好吧。第一次通过我错过了你的索引连接。试试这个:
if ($allFieldsPresent) {
$keys = array();
foreach ($dimensionFieldNames as $keyFieldName) {
$keys[] = $row[$keyFieldName];
// lets sum values
foreach ($sumFieldNameArray as $sumFieldName)
self::deepAssign($outArray, $keys, $sumFieldName, $row[$sumFieldName], true);
foreach ($staticFieldNameArray as $staticFieldName)
self::deepAssign($outArray, $keys, $staticFieldName, $row[$staticFieldName]);
}
}
protected static function deepAssign(&$array, $keys, $fieldName, $value, $sum = false) {
$target =& $array;
foreach ($keys as $key) {
if (!isset($target[$key]))
$target[$key] = array();
$target =& $target[$key];
}
if($sum)
$target[$fieldName] += $value;
else
$target[$fieldName] = $value;
}
关于PHP:需要一个 eval() 的替代方法来动态构建多维数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11352669/