Extending method, passing by reference

[stadskle]

I am making a class extending the mysqli_stmt class. But I am having problems with the bind_param method. In these situations where I need to override a native PHP function that can handle unlimited amount of parameters I use this code:

<?php
public function bind_param($types){

  if( call_user_func_array(array($this, 'parent::'.__FUNCTION__), $args) 
       === false ){
             throw new  DBQueryException($this->error,$this->errno,$this->sqlstate,$this->query);
  }		
}
?>

But the bind_params function requires the parameters after $types to be passed by reference. How can I do this?

[llook]

I gues it is not possible this way. If you need to pass unknown amount of variables by reference, you can use an array:

function bind_param($types, $args) {
    call_user_func_array(array("parent", "bind_param"), $args);
}

// usage:
$stmt->bind_param("iii", array(&$param1, &$param2, &$param3)); 

Ugly hack . Or you can pass always only one parameter and to provide so called "fluent interface":

function bind_param($type, &$param) {
    call_user_func_array(array("parent", "bind_param"), array(&$param));
    return $this;
}

// usage:
$stmt->bind_param("i", $param1)
    ->bind_param("i", $param2)
    ->bind_param("i", $param3); 

Or you can change the behavior and pass them by value...

[stadskle]

The problem here is that I am extending the native mysqli function bind_param, and that requires multiple parameters to be passed by ref.

http://php.net/manual/en/function.my...bind-param.php

[Mau]

Perhaps one of the rare appropriate uses of eval()?

[auricle]

Since passing by reference is defined in the message signature, and not in the calling code, there is no way to do this.

Maybe rather than extending mysqli_stmt(), perhaps you should decorate it. I found myself having to do this recently to with a Statement class. I wanted to be able to foreach() a PDOStatement object with PDO::FETCH_CLASS and PDO::FETCH_OBJECT. But those fetch modes only work with the fetch*() methods, so I ended up wrapping a PDOStatement object in an Iterator.