Binding array of values in prepared statement PDO PHP - php

Question

I'm trying to bind my values into a prepared statement in PDO.
Here is the pre requisite codes that that uses the prepared statement block:
$tab = 'air_user';
$fie = array('USER_NAME', 'USER_PASSWORD' , 'USER_EMAIL');
$name = $_POST['name'];
$pass = $_POST['password'];
$email = $_POST['email'];
$val = array(
'name' => $name,
'pass' => $pass,
'email' => $email
);
$this->connect($tab,$fie,$val);
And here is the part wherein I prepare those values and make the necessaru insertions:
public function connect($table,$fields,$values)
{
try{
$con = new PDO ('mysql:host=localhost;dbname=air','root','123456');
$con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$con->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$fields = implode(", ", $fields);
echo $fields;
$values = implode(", ", $values);
echo $values;
// have to make this prevent sql injection //
$stmt = $con->prepare("INSERT INTO $table(ID,$fields) VALUES (?,?,?,?)");
$stmt->execute(array('',$values));
} catch(PDOException $e) {
die("this cant connect the database");
}
}
so why isit my INSERT not Working ? isit can anyone help me take a look of it , i tryed so many things , none of them work.

Answer 1

No, don't implode the values that your going to pass inside the ->execute(), it must be an array:
$fields = implode(", ", $fields);
// $values = implode(", ", $values); // DONT IMPLODE!
$values = array_values($values);
$stmt = $con->prepare("INSERT INTO $table(ID,$fields) VALUES (NULL, ?,?,?)");
$stmt->execute($values);
Or #Augwa's suggestion:
// $fields = implode(", ", $fields); // not needed
// $values = implode(", ", $values); // DONT IMPLODE!
$placeholders = substr(str_repeat('?,', sizeOf($fields)), 0, -1);
// $placeholders = implode(', ', array_fill(0, count($values), '?'));
$stmt = $con->prepare(
sprintf(
"INSERT INTO %s (%s) VALUES (%s)",
$table,
implode(',', $fields),
$placeholders
)
);
$stmt->execute($values);