MySQLI binding params using call_user_func_array

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It must be like this:

//connect
$mysqli = new mysqli($host, $user, $password, $db_name);

//prepare
$stmt = $mysqli->prepare("SELECT * FROM the_table WHERE field1= ? AND Field2= ?");

//Binding parameters. Types: s = string, i = integer, d = double,  b = blob
$params= array("ss","string_1","string_2");

//now we need to add references
$tmp = array();
foreach($params as $key => $value) $tmp[$key] = &$params[$key];
// now us the new array
call_user_func_array(array($stmt, 'bind_param'), $tmp);

$stmt->execute();

/* Fetch result to array */
$res = $stmt->get_result();
while($row = $res->fetch_array(MYSQLI_ASSOC)) {
  $a_data[]=$row;
}
print_r($a_data);

$stmt->close();

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