Dynamic Binding for PHP MySQLi
Dynamic Parameter Binding
In PHP MySQLi, the bind_param() method allows for the binding of parameters to a prepared statement. However, for dynamic binding, where parameters can vary in quantity and type, the default method falls short.
Solution
To overcome this limitation, the following solution can be employed:
Using Unpacking Operator and get_result()
With PHP 5.6 and later, the unpacking operator (...) and get_result() can be used to simplify dynamic binding:
public function get_custom_result($sql, $types = null, $params = null) {
$stmt = $this->mysqli->prepare($sql);
$stmt->bind_param($types, ...$params);
if (!$stmt->execute()) return false;
return $stmt->get_result();
}
Example
This example illustrates how to dynamically bind parameters and retrieve the result:
$mysqli = new database(DB_HOST, DB_USER, DB_PASS, DB_NAME);
$output = new search($mysqli);
$sql = "SELECT * FROM root_contacts_cfm WHERE root_contacts_cfm.cnt_id = ?
AND root_contacts_cfm.cnt_firstname = ?
ORDER BY cnt_id DESC";
$res = $output->get_custom_result($sql, 'ss', array('1', 'Tk'));
while ($row = $res->fetch_assoc()) {
echo $row['fieldName'] . '<br>';
}
This approach provides a dynamic way to bind parameters based on the parameters passed to the function call.
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