call function dynamically, passing arguments from variable

问题

here is my ajax_handle file:

   if ($_SERVER['HTTP_X_REQUESTED_WITH'] !== "XMLHttpRequest") 
    {
        echo "Error"; 
        exit();

    }
    $req = explode("_",$_POST['req']);
    $className = $req[0] . "Controller" ;
    $methodName = $req[1];
    $file = "application/controllers/" . $className . ".php" ;
    require_once $file;
    if ($_POST['data']) {
        var_dump($_POST['data']);
    }
    $controller = new $className;
    $result = $controller->$methodName();
    echo json_encode($result);

I send the arguments as any array in the $_POST['data'] variable. i have no idea what would be the best way to pass them to the (dynamic) $methodName function.

回答1:

I suppose you could just pass $_POST['data'] as is to your dynamic method. You can have the dynamic method accept the array but initially set default values so you can easily handle and validate them. Example:

class AController
{
  public function dynamicMethod($params)
  {
    // Set default values but allow them to be overridden by $params
    $locals = array_merge(array(
      'name' => 'John Doe',
      'address' => 'Nowhere',
    ), $params);

    // Do stuffs and return result. Example:
    return array('nameAndAddress' => $locals['name'] . ' lives at ' . $locals['address']);
  }
}

You also opt to use extract() to convert the name and address above into real local variables.

In your ajax handle:

$controller = new $className;
$result = $controller->$methodName($_POST['data']);
echo json_encode($result);

With all these said, please note that what @Sven is saying is correct. There are some security issues in your current approach.

来源：https://stackoverflow.com/questions/17842359/call-function-dynamically-passing-arguments-from-variable

标签

php

function

dynamic