Question

折扣数组

 $Discount=arrray(
 0=>array('FromArea'=>0,'ToArea'=>0,'Master'=>0,'Slave'=>0),
 1=>array('FromArea'=>0,'ToArea'=>10,'Master'=>5,'Slave'=>0),
 2=>array('FromArea'=>5,'ToArea'=>0,'Master'=>0,'Slave'=>8),
 3=>array('FromArea'=>0,'ToArea'=>0,'Master'=>1,'Slave'=>2),
 4=>array('FromArea'=>0,'ToArea'=>1,'Master'=>7,'Slave'=>5),
 ...
 )

我想根据功能的输入参数获得折扣金额。

如果！empty（参数），则在数组中检查

喜欢这个

function DiscountAmount($FromArea, $ToArea, $Master, $Slave){
    foreach ($Discounts as $R) {
         if (!empty($FromArea) && empty($ToArea) && empty($Master) && empty($Slave)) {
              if ($R["FromArea"] == $FromArea)
                  return true;
         } else if (!empty($FromArea) && !empty($ToArea) && empty($Master) && empty($Slave)) {
              if ($R["FromArea"] == $FromArea && $R["ToArea"] == $ToArea)
                  return true;
         } else if (!empty($FromArea) && !empty($ToArea) && !empty($Master) && empty($Slave)) {
              if ($R["FromArea"] == $FromArea && $R["ToArea"] == $ToArea && $R["Master"] == $Master)
                  return true;
         } else if (!empty($FromArea) && !empty($ToArea) && !empty($Master) && !empty($Slave)) {
              if ($R["FromArea"] == $FromArea && $R["ToArea"] == $ToArea && $R["Master"] == $Master && $R["Slave"] == $Slave)
                  return true;
         } else if (!empty($FromArea) && !empty($ToArea) && !empty($Master) && !empty($Slave)) {
              if ($R["FromArea"] == $FromArea && $R["ToArea"] == $ToArea && $R["Master"] == $Master && $R["Slave"] == $Slave)
                  return true;
         }
         ...
      }
}
$amout=DiscountAmount(0, 0, 0, 0);
$amout=DiscountAmount(1, 0, 0, 0);
$amout=DiscountAmount(0, 1, 0, 0);
$amout=DiscountAmount(0, 0, 1, 0);
$amout=DiscountAmount(0, 0, 0, 1);
$amout=DiscountAmount(1, 1, 0, 0);
$amout=DiscountAmount(1, 0, 1, 0);
$amout=DiscountAmount(1, 0, 0, 1;
$amout=DiscountAmount(1, 1, 1, 0);
$amout=DiscountAmount(1, 1, 0, 1);
$amout=DiscountAmount(1, 1, 1, 0);
$amout=DiscountAmount(1, 1, 1, 1);
....

Online Demo 但是通过这种方式你必须检查非常情况。有没有更简单的解决方案呢？

Answer 1

function DiscountAmount($FromArea, $ToArea, $Master, $Slave)
{
  //This line's simply to save time:  if all fields are empty, no need to check further
  if(empty($FromArea) && empty($ToArea) && empty($Master) && empty($Slave)) 
       return true;    
  foreach ($Discounts as $R)
  if (equiv($FromArea, $R["FromArea"]) &&
      equiv($ToArea,   $R["ToArea"  ]) &&
      equiv($Master,   $R["Master"  ]) &&
      equiv($Slave,    $R["Slave"   ]))
        return true;

  return false;
}

function equiv($Field,$OtherField)
{
  if (empty($Field)) return true;
  else return $Field == $OtherField;
}

这应该显着减少笨重。

Answer 2

function DiscountAmount($FromArea = null, $ToArea = null, $Master = null, $Slave = null) {
    global $Discounts; //pull discount array into the function
    $argsCount = count(func_get_args()); //the number of arguments filled in
    $checkArray = array(
        'FromArea' => $FromArea, 'ToArea' => $ToArea, 'Master' => $Master, 'Slave' => $Slave
    );
    while (count($checkArray) < $argsCount) {
        array_pop($checkArray);
    }
    foreach ($Discounts as $R) {
        if ($checkArray == $R) { //checks if all key/value pairs are equal
            return true;
        }
    }
    return false;
}

Answer 3

尝试使用正则表达式：

function DiscountAmount($FromArea = null, $ToArea = null, $Master = null, $Slave = null){

    if(empty($FromArea) && empty($ToArea) && empty($Master) && empty($Slave)) return true;

    global $Discounts;

    $json = json_encode($Discounts);

    $reg = "/\{";

    if(!empty($FromArea))   $reg .= "(?:[^\}]*\"FromArea\":{$FromArea})";
    if(!empty($ToArea))     $reg .= "(?:[^\}]*\"ToArea\":{$ToArea})";
    if(!empty($Master))     $reg .= "(?:[^\}]*\"Master\":{$Master})";
    if(!empty($Slave))      $reg .= "(?:[^\}]*\"Slave\":{$Slave})";

    $reg .= "[^\}]*\}/";

    return preg_match($reg, $json);     

}

Answer 4

我认为这将消除冗余：

function DiscountAmount($Parameters){
    foreach ($Discounts as $R) {
        foreach ($Parameters as $PK => $P) {
            $CheckFlag = true;
            if (!empty($P)) {
                if ($R[$PK] != $P) {
                    $CheckFlag = false;
                    break;
                }
            }
        }
        if (!empty($CheckFlag)) { return true; }
    }
    return false;
}

假设：

根据问题的代码和接受的答案：

如果任何数组具有与输入值匹配的非空值，则该函数必须返回true

如果所有输入数组都为空，则函数必须返回true

测试

http://ideone.com/otiUJw

4个变量之间的条件不同

4 个答案:

假设：

测试