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Insert Array in MySQL

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I'm trying to insert array of posts categories into MySQL. I'm getting category IDs from drop down list..

ERR: Notice: Notice: Array to string conversion in C:\laragon\*********\includes\functions.php on line 477

 

Array

Array
(
    [0] => Array
        (
            [0] => 4
            [1] => 5
        )

)

 

PHP

try {
        $sql = "INSERT INTO posts_category_ids (post_id, category_id) VALUES";

        $insertQuery = array();
        $insertData = array();
        foreach ($filter_category as $row) {
            $insertQuery[] = '(?, ?)';
            $insertData[] = $id;
            $insertData[] = $row;
        }

        if (!empty($insertQuery)) {
            $stmt = $this->conn->prepare($sql);
            $stmt->execute($insertData); //477
        }


         }catch (Exception $e){

            echo $e->getMessage();
}
}

 

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I'm surprised it got past the prepare statement before giving an error.

Where do $id and $row come from?

Are the two sections of code above related in any way?

If, say, you want to add 3 records inserting post_id and category_id into each then the query that gets prepared should look like

"INSERT INTO posts_category_ids (post_id, category_id) VALUES (?,?),(?,?),(?,?)"  

 

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From insert query for posts..

$id = $this->conn->lastInsertId();

I would like something like this..

+----+---------+-------------+
| id | post_id | category_id |
+----+---------+-------------+
| 1  | 2       | 3           |	
| 2  | 2       | 5           |	
| 3  | 3       | 1           |
| 4  | 3       | 2           |
+----+---------+-------------+

The hole problem is inside  my array. 

 

 

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