如何一次只获取一个键值对？ PHP

Question

我是 PHP 新手，所以需要一些帮助。

我似乎已经几乎达到了我所需要的。但是，下面的代码将完全符合我的要求，即遍历每条记录并获取所有键值对。尽管如此，一旦条件达到“else”，我不想打印所有剩余的 $key $val 对。相反，我想要的是抓住下一个最关键的 => val 对并重复直到每条记录完成。

例如现在这段代码将打印出我想要的每条记录的 LIST_1、LIST_87。我希望它也只抓住下一对 $key => $val，而不是剩下的。这样我就可以将每个 $key => $val 对注入到 mySql 中的一行中。

但是现在，它给了我 LIST_1、LIST_87 和所有剩余的 $key => $val's。 它看起来像这样：

Record: 0 *************************

LIST_124 => 0.00
GF20121126194243819854000000 => Entry Lvl Lvng Area,Fire Sprinkler,Foyer,Pantry,Volume Ceiling,Walk-in Closet
LIST_125 => 161.14
LIST_122 => 
LIST_123 => 
LIST_126 => 154.18
ROOM_BR2_room_level => 1
VOWAddr => 1
ROOM_PR_room_width => 10.6
GF20121126194243879313000000 => Gate - Manned,Security Patrol
listing_office_phone => (561) 622-5000
GF20121128203448419411000000 => Dining Family,Snack Bar
selling_member_email => jafeldman38@gmail.com
LIST_87 : 2015-01-01T00:01:52
LIST_1 : 20141118214124325535000000

I want it to do this:

Record: 0 *************************

INSERT ---
LIST_87 : 2015-01-01T00:01:52
LIST_1 : 20141118214124325535000000
LIST_124 => 0.00

INSERT ---
LIST_87 : 2015-01-01T00:01:52
LIST_1 : 20141118235552432553500000
LIST_125 => 161.14

INSERT ---
LIST_87 : 2015-01-01T00:01:52
LIST_1 : 20141445635552432553500000
GF20121126194243819854000000 => Entry Lvl Lvng Area,Fire, Sprinkler,Foyer,Pantry,Volume Ceiling,Walk-in Closet

代码：

$prop_fields  = array("");
$prop_vals    = array("");
$LIST_1      = "";
$LIST_87     = "";
$count;

class Insert_Data
{

    public function create_insert_sql_from_search(){
      Global $results, $prop_fields, $prop_vals, $LIST_1, $LIST_87, $count ;
      for ($i=0; $i < count($results) ; $i++) { 
          // print "$results[$i]<br/><br/>";
          echo "<br/><br/>Record: $i *************************<br/><br/>";
          $myData = json_decode($results[$i]);
          foreach ($myData as $key => $val) {
              // We append the key and a comma to the end for every key inside the dbkeys array
              if($key == 'LIST_1'){
               $LIST_1 = $val;
               echo "LIST_1 : $LIST_1<br/>";
              }elseif($key == 'LIST_87'){
                $LIST_87 = $val;
                echo "LIST_87 : $LIST_87<br/>";
              }else{
                    echo "$key => $val<br/>";
              }
          }
      } 
    }
}
// create an object
$update = new Insert_Data();

// // show object properties
$update->create_insert_sql_from_search();
// echo "</pre>";

Answer 1

Continue();

您想使用 Continue，但另请参阅 Break 并通过键直接访问数组值。

Answer 2

1. 您正在使用 JSON，为什么不直接使用键检索数据而不是再次循环遍历 JSON 数组？

$myData = json_decode($results[$i]);
$List_1 = $myData->List_1;
echo "List 1 : $List_1";
$List_87 = $myData->List_87;
echo "List 87 : $List_87";

1. 我会选择 1，因为它可以避免您循环遍历所有内容。如果您仍然想要随机一对，您可以；

$randomKey = null;
while($randomKey != "List_1" || $randomKey != "List_87"){
$keys = array_keys($myData);
$randomKey = $keys[ rand(0, count($keys)-1) ];
}

echo "$randomKey : $myData->$randomKey";

另一种方式（您的方式）是在显示记录时在 A 为真（找到 LIST_1）且 B 为真（找到 LIST_87）时在下一条记录上使用 Break

foreach ($myData as $key => $val) {
$a = false,  $b = false;
if($key == 'LIST_1'){
    $LIST_1 = $val;
    $a =  true;
               echo "LIST_1 : $LIST_1<br/>";
}elseif($key == 'LIST_87'){
    $LIST_87 = $val;
    $b = true
    echo "LIST_87 : $LIST_87<br/>";
}else{
    if($a && $b){
    echo "$key => $val<br/>";
    break;
}
}
}

Answer 3

This the current workable solution and can be refactored further.

require_once('login.php');
$prop_fields  = array("");
$prop_vals    = array("");

class Insert_Data
{

    public function create_insert_sql_from_search(){
      Global $results, $prop_fields, $prop_vals, $LIST_1, $LIST_87;
      for ($i=0; $i < count($results) ; $i++) { 
          // print "$results[$i]<br/><br/>";
          echo "<br/><br/>Record: $i *************************<br/><br/>";
          $myData = json_decode($results[$i]);
          $count = 0;
          $LIST_1      = "";
          $LIST_87     = "";
          $elements    = array();
          // iterate over myData to extract LIST_1 AND LIST_87 vals
          foreach ($myData as $key => $val) {
              // We append the key and a comma to the end for every key inside the dbkeys array
              if($key == 'LIST_1') {
                $LIST_1 = $val;
                // echo "$key : $LIST_1 <br/>";
              } elseif($key == 'LIST_87'){
                $LIST_87 = $val;
                // echo "$key : $LIST_87 <br/>";
              } else {
                continue;
              }
          }
          // iterate over myData to extract everything else
          foreach ($myData as $key => $val) {
              // We append the key and a comma to the end for every key inside the dbkeys array
              if (($key == 'LIST_1') || ($key == 'LIST_87')) {
                continue;
              } else {
                // add to our array 
                array_push($elements, array($LIST_1, $key, $val, $LIST_87));
              }
          }
          // done 
          // display our results
          //print_r($elements);

          foreach ($elements as $key => $value) {
            $query = "INSERT INTO [TABLE] (`LIST_1`, `KEY`, `VALUE`, 'LIST_87') VALUES ({$elements[$key][0]}, {$elements[$key][1]}, {$elements[$key][2]}, {$elements[$key][3]});";
            print_r($query); echo "<br>";  
          }

       } // $conn->close();
    }
}
// create an object
$update = new Insert_Data();

// // show object properties
$update->create_insert_sql_from_search();
// echo "</pre>";