如何在数组中检查数组中是否存在值，以及是否需要处理相应的数据 - How to check in array whether value in array exist and if does take the corresponding data to process

How to check in array whether value in array exist and if does take the corresponding data to process

我一直在对数组进行排序，以取出唯一值并将相关值处理为累积值。

源代码：

while($row1 = mysql_fetch_array($result1))
{ 
$row1[8] = $row1[8] / 60;
 echo    "<tr>".
         "<td>".$row1[0]           . "</td>".
         "<td>".$row1[1]           . "</td>".
         "<td>".$row1[2]           . "</td>".
         "<td>".$row1[3]           . "</td>".        
         "<td>".$row1[4]           . "</td>".
         "<td>".$row1[5]           . "</td>".
         "<td>".$row1[6]           . "</td>".
         "<td>".$row1[7]           . "</td>".
         "<td>".$row1[8]           . "</td>".
         "<td>".$row1[9]           . "</td>";
         $counters = array();
         $counters[$row1[9]] += $row1[8];
         arsort($counters);
        var_dump($counters);

var转储如下：

array(1) { ["derek"]=> int(2) } 
array(1) { ["garyhui"]=> float(0.5) } 
array(1) { ["nikole"]=> int(1) } 
array(1) { ["tony"]=> int(4) } 
array(1) { ["tony"]=> int(2) } 
array(1) { ["tony"]=> float(3.5) } 
array(1) { ["tony"]=> float(2.5) }

我需要的最终结果是smth类似

Derek : 2
Garyhui : 0.5
Nikole : 1

托尼：12<--请注意，这个数字能够根据以前的数组索引关联自行累积。感谢您的帮助！

使用array_key_exists（）检查现有键值：

#like @Erik said, place this out of while loop,
#keeping it inside while makes it empty in every loop
$counters = array();
while($row1 = mysql_fetch_array($result1))
{ 
  /*
     Your echo code here
  */
  if(array_key_exists($row1[9],$counters)){
     #if exists, accumulate value of current key
     $counters[$row1[9]] += $row1[8];
  }
  else
  {
     #if does not exist, create new key
     $counters[$row1[9]] = $row1[8]; 
  }
}

您一直在将$counters重新定义为空数组，因为您一直在循环中执行$counters = array()。这就是为什么它们加不起来的原因。您必须删除这一行代码，并将其移动到循环上方的某个位置。就像这样：

$counters = array();
while($row1 = mysql_fetch_array($result1))
{ 
    $row1[8] = $row1[8] / 60;
     echo    "<tr>".
     "<td>".$row1[0]           . "</td>".
     "<td>".$row1[1]           . "</td>".
     "<td>".$row1[2]           . "</td>".
     "<td>".$row1[3]           . "</td>".        
     "<td>".$row1[4]           . "</td>".
     "<td>".$row1[5]           . "</td>".
     "<td>".$row1[6]           . "</td>".
     "<td>".$row1[7]           . "</td>".
     "<td>".$row1[8]           . "</td>".
     "<td>".$row1[9]           . "</td>";
     $counters[$row1[9]] += $row1[8];
     arsort($counters);
    var_dump($counters);