PHP PDO Prepared statement request not updating record

Question

I am having a problem using a PHP PDO object to prepare update instructions and update records. I took the original SQL query and ran it in phpMyAdmin with the parameters replaced with the values ​​that are passed to the function. Which updates the record at its discretion. However, when run from a script, it is not updated. It throws zero errors and returns an errorInfo () 00000 response, which, as I understand it, is a PDO way of saying that everything is fine. I know that the PDO object works because it successfully inserts and selects records from the database, including the one I am trying to update. I understand that this update function is ugly, I'm just learning PDO.

Obviously this is encoded in PHP5 using PDO.

Class function:

public function update($tbl_name, $where = null, $what = null)
    {
        if(is_array($where))
        {
            $where_str = 'where ';
            foreach($where as $key => $val)
            {
                $where_str .= "{$key} = ':{$key}' and ";
            }
            $where_str = substr($where_str,0,-5);

            $what_str = 'set ';
            foreach($what as $key => $val)
            {
                $what_str .= "`{$key}` = ':{$key}', ";
            }
            $what_str = substr($what_str,0,-2);

            $query_str = "update {$tbl_name} {$what_str} {$where_str} LIMIT 1;";
            $stmt = $this->dbh->prepare($query_str);
            echo '<pre>'.print_r($stmt, true).'</pre>';
            foreach($what as $key => $val)
            {
                if('date_time' === $key) continue;
                $bind = $stmt->bindValue(":{$key}",$val);
                echo ($bind ? 'true' : 'false')." :{$key}=",$val,'<br/>';
            }
            foreach($where as $key => $val)
            {
                if('date_time' === $key) continue;
                $bind = $stmt->bindValue(":{$key}",$val);
                echo ($bind ? 'true' : 'false')." :{$key} ",$val,'<br/>';
            }
        }else{
            return false;
        }
        $this->dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $exec = $stmt->execute();
        echo 'exec: '.($exec === true ? 'true:' : 'false:').':'.$exec.'<br/>';

        echo '<pre>';
        $stmt->debugDumpParams();
        echo '</pre>';

        return $stmt->errorInfo();
    }

update/login script:

$where = array(
    'id' => $user['id'],
    );
$what = array(
    'twitter_key'    => $oauth_token,
    'twitter_secret' => $oauth_token_secret
    );

$update = $db->update('users', $where, $what);

print_r :

// print_r($stmt = $this->dbh->prepare($query_str)) output:
PDOStatement Object
(
    [queryString] => update users set `twitter_key` = ':twitter_key', `twitter_secret`     = ':twitter_secret' where id = ':id' LIMIT 1;
)

// output from the bing params and execution returns
true :twitter_key=XXXXXXXXXXXXXXXXXXXXXXXXXXXX
true :twitter_secret=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
true :id 20
exec: true:1

// $stmt->debugDumpParams() output: 
SQL: [111] update users set `twitter_key` = ':twitter_key', `twitter_secret` = ':twitter_secret' where id = ':id' LIMIT 1;
Params:  3
Key: Name: [12] :twitter_key
paramno=-1
name=[12] ":twitter_key"
is_param=1
param_type=2
Key: Name: [15] :twitter_secret
paramno=-1
name=[15] ":twitter_secret"
is_param=1
param_type=2
Key: Name: [3] :id
paramno=-1
name=[3] ":id"
is_param=1
param_type=2

// print_r($stmt->errorInfo()) output:
Array
(
    [0] => 00000
)

Answer 1

PDO, , - , . - .

docs , SQL $stmt->queryString. , $stmt.

print_r() (, , , ). .

Answer 2

​​ , ... , - , , -.

public function update($tbl_name, $where = null, $what = null)
    {
        if(is_array($where) && is_array($what))
        {
            $where_str = 'where ';
            foreach($where as $key => $val)
            {
                $where_str .= "{$key} = :{$key} and ";
            }
            $where_str = substr($where_str,0,-5);

            $what_str = 'set ';
            foreach($what as $key => $val)
            {
                $what_str .= "{$key} = :{$key}, ";
            }
            $what_str = substr($what_str,0,-2);

            $query_str = "update {$tbl_name} {$what_str} {$where_str} LIMIT 1;";
            $stmt = $this->dbh->prepare($query_str);
            foreach($what as $key => $val)
            {
                if('date_time' === $key) continue;
                $bind = $stmt->bindValue(":{$key}",$val);
            }
            foreach($where as $key => $val)
            {
                if('date_time' === $key) continue;
                if('id' === $key)
                {
                    $bind = $stmt->bindValue(":{$key}",$val, PDO::PARAM_INT);
                }else{
                    $bind = $stmt->bindValue(":{$key}",$val);
                }
            }
        }else{
            return false;
        }
        $stmt->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $exec = $stmt->execute();
        return $stmt->errorInfo();
    }