framework/db/Command.php
public function bindParam($name, &$value, $dataType = null, $length = null, $driverOptions = null)
    {
        $this->prepare();

        if ($dataType === null) {
            $dataType = $this->db->getSchema()->getPdoType($value);
        }
        if ($length === null) {
            $this->pdoStatement->bindParam($name, $value, $dataType);
        } elseif ($driverOptions === null) {
            $this->pdoStatement->bindParam($name, $value, $dataType, $length);
        } else {
            $this->pdoStatement->bindParam($name, $value, $dataType, $length, $driverOptions);
        }
        $this->params[$name] = &$value;

        return $this;
    }
public function bindParam($name, &$value, $dataType = null, $length = null, $driverOptions = null)
    {
        $this->prepare();

        if ($dataType === null) {
            $dataType = $this->db->getSchema()->getPdoType($value);
        }
        if ($length === null) {
            $this->pdoStatement->bindParam($name, $value, $dataType);
        } elseif ($driverOptions === null) {
            $this->pdoStatement->bindParam($name, $value, $dataType, $length);
        } else {
            $this->pdoStatement->bindParam($name, $value, $dataType, $length, $driverOptions);
        }
        $this->params[$name] = &$value;

        return $this;
    }
Binds a parameter to the SQL statement to be executed.
@param string|int $name parameter identifier. For a prepared statement
using named placeholders, this will be a parameter name of
the form `:name`. For a prepared statement using question mark
placeholders, this will be the 1-indexed position of the parameter.
@param mixed $value the PHP variable to bind to the SQL statement parameter (passed by reference)
@param int $dataType SQL data type of the parameter. If null, the type is determined by the PHP type of the value.
@param int $length length of the data type
@param mixed $driverOptions the driver-specific options
@return $this the current command being executed
@see https://secure.php.net/manual/en/function.PDOStatement-bindParam.php