Question

我有一个数组year_values包含一些值，如

$year_values = array();
foreach($year_strings as $str) {
  $year_values[] = explode(",", $str);
}

然后我应用查询从数据库中提取一些值

$sql = "SELECT inventory.holdingcost as holdingcost, 
inventory.ordercost as ordercost, inventory.unitprice as unitprice, 
inventory.lead_time as lead_time, items.id as iid 
FROM inventory, items 
WHERE inventory.item_name = items.item_name";
        mysql_error();

        $result = mysql_query($sql);
    foreach($year_values as $vals) {

      while ($row = mysql_fetch_row($result)) {



      $w = $row[2];
      $e = $row[0];
      $r = $row[1];
      $tt = $row[3];
      $eo = sqrt(2 *  $vals[5] * $r / ($e * $w));
      $eoq = round($eo, 1);
      $ro = $vals[5] / 360;
      $rop = round($ro * $tt);
      $op = round($vals[5] / $eoq, 1);
      $cc = round(89 / $op);
      $h = round((($eoq * $e * $w) / 2), 2);
      $o = round((($r * $vals[5]) / $eoq), 2);
      $z = round($h + $o, 2);


       }
    }

当我在循环中使用foreach时，它只需将$year_values的第一个值作为$ vals [5]，我想在内部进行计算，同时为数组$year_values的每个值。

如何纠正？

重复发生在value1，即$ val [5]目前：

Value1      Value 2    Value 3
199           202           0.25
199           205           0.25
199           210           0.25
199           230           0.25
1698          202           0.25
1698          205           0.25
1698          210           0.25
1698          230           0.25

我希望值显示为

Value1      Value 2    Value 3
199          202           0.25
1698         205           0.25
15           210           0.25
971          230           0.25

Answer 1

我猜您只需存储所有数据，以便重复使用。

$result = mysql_query($sql);
$rows = array() ;
while ($row = mysql_fetch_row($result)){
  $rows[] = $row ;
}

foreach($year_values as $vals) {
  foreach($rows as $row){
   $w = $row[2];
   $e = $row[0];
   $r = $row[1];
   $tt = $row[3];
   $eo = sqrt(2 *  $vals[5] * $r / ($e * $w));
   $eoq = round($eo, 1);
   $ro = $vals[5] / 360;
   $rop = round($ro * $tt);
   $op = round($vals[5] / $eoq, 1);
   $cc = round(89 / $op);
   $h = round((($eoq * $e * $w) / 2), 2);
   $o = round((($r * $vals[5]) / $eoq), 2);
   $z = round($h + $o, 2);
  }
}

Answer 2

简单地颠倒声明：

while ($row = mysql_fetch_row($result)) {
foreach($year_values as $vals) {


      $w = $row[2];
      $e = $row[0];
      $r = $row[1];
      $tt = $row[3];
      $eo = sqrt(2 *  $vals[5] * $r / ($e * $w));
      $eoq = round($eo, 1);
      $ro = $vals[5] / 360;
      $rop = round($ro * $tt);
      $op = round($vals[5] / $eoq, 1);
      $cc = round(89 / $op);
      $h = round((($eoq * $e * $w) / 2), 2);
      $o = round((($r * $vals[5]) / $eoq), 2);
      $z = round($h + $o, 2);


       }
    }

Answer 3

一旦全部获取了行，

mysql_fetch_row将返回false。要重复使用它，您应该将它们存储在变量(like the response made by Jari)中，或者您可以切换两个周期(see imulsion's answer)

使用foreach和while循环

3 个答案: