Question

我收到错误在下面的代码中为foreach（）提供的无效参数。谁能告诉我这里做错了什么？我想在这里访问子数组值[0]和[1]。只是提到我现在不知道很多值将在子数组中。

我在违规代码行（错误所在的位置）上面发表了评论

  echo "<pre>";
  print_r($mySessData);
  echo "</pre>";


Array
(
    [addtypeid] => 
    [isnew] => 
    [orderby] => 
    [geographicareaid] => 
    [catid] => 1
    [catid2] => 
    [manufacturerid] => 
    [modelid] => 
    [yearofmanufacturing_from] => 
    [yearofmanufacturing_to] => 
    [hoursused_from] => 
    [hoursused_to] => 
    [horsepowers_from] => 
    [horsepowers_to] => 
    [price_from] => 
    [price_to] => 
    [colorid] => 
    [isdamaged] => 
    [categoriesfilters] => 
    Array
        (
            [0] => 67
            [1] => 158
        )
)

 $sessData = array();
 $myresult = array();
 $val = array();   

 if (!empty($mySessData)){
     foreach ($mySessData as $sessData) { 
         // the line bellow is the offending line, where the error is thrown
         foreach ($sessData as $val) { 
             $myresult[$val]= $val; 

             foreach($filters as $f) {
                 if ($f['filterid'] == $myresult[$val]) {
                     $strWhere2 .= $myresult[$val] .",";
                 } // end if
             } // end of third foreach

         } // end of second foreach 
     } // end of first foreach
 } // end if

Answer 1

那是因为你没有检查$sessData实际上是否是一个数组。实际上，只有一个案例中的数组正在查看您的转储。只需添加另一个if (is_array($sessData))

即可

Answer 2

在循环之前，您需要检查您的值是否是实际数组。当前数组的唯一值是[categories filters]

Answer 3

这个变量$sessData可能会从更大的循环中变空

并循环遍历它，在PHP＆lt; = 5.3中它将会中断：

Answer 4

您有一个“简单数组”，并尝试将其作为多维数组处理。

您可能希望使用foreach($mySessData as $key => $val)填充变量$myresult，并使用if (is_array($val))来处理categoriesFilter键。

我不知道你到底需要什么，但这可能会对你有所帮助：

 $myresult = array();

 if (!empty($mySessData)){
     foreach ($mySessData as $key => $val) { 
         // the line bellow is the offending line, where the error is thrown
             $myresult[$val]= $val; 
     }

     // I don't know what filters refers to, but I suppose you have to do something like this:
     $strWhere2 = '';
     foreach($filters as $f) {
       foreach($myresult['categoriesFilter'] as $categ_filter)
         if ($f['filterid'] == $categ_filter) {
           $strWhere2 .= $categ_filter .",";
     }
 } // end if

无法解决这个问题：为foreach（）提供的参数无效

4 个答案: