选择具有数组值的查询

Question

I save with the first query any values into an array $ownco . With the second query I try to get all rows of the table posts where the id have the same values as in the array $ownco .

two errors:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'Array' in 'where clause'

: Array to string conversion in line 34

$hostname='localhost';
            $user='root';
            $password='';
            $useron = $_COOKIE['username'];
                    try {
                            $dbh = new PDO("mysql:host=$hostname;dbname=searchfood",$user,$password);

                            $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // <== add this line
                             $sql = "SELECT id_post 
    FROM comments 
    WHERE username = '$useron'
    ORDER BY id DESC"; // oder (longitude between $loo and $lo or latitude  between $laa and $la) versuchen
      if ($own = $dbh->query($sql)) {// need to add this line in your code
          // then after fetchColumn
         $ownco = $own->fetchAll();      
       }                        
                    }
                    catch(PDOException $e)
                    {
                            echo $e->getMessage();
                    }  


                    try {
                            $dbh = new PDO("mysql:host=$hostname;dbname=searchfood",$user,$password);

                            $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // <== add this line
                             $sql = "SELECT id, autorid, autor, date, longitude, latitude, title, text, town, time 
    FROM posts 
    WHERE id in (" . implode(",",$ownco) . ") // line 34
    ORDER BY id DESC"; // oder (longitude between $loo and $lo or latitude  between $laa and $la) versuchen
      if ($resco = $dbh->query($sql)) {// need to add this line in your code
          // then after fetchColumn
         $resultcom = $resco->fetchAll();        
       }                        
                    }
                    catch(PDOException $e)
                    {
                            echo $e->getMessage();
                    }    

Answer 1

You have to change the fetch style. Currently you are using the default "FETCH_BOTH" which results in something like:

Array
(
    [0] => Array
        (
            [name] => pear
            [0] => pear

If you change the fetchAll to only fetch the column it should work as expected.

$ownco = $own->fetchAll(PDO::FETCH_COLUMN, 0);

Results:

Array
(
    [0] = 1,
    [1] = 3,

etc.