Joomla 3.0 JFactory :: getApplication（）始终返回null

Question

I'm trying the extract the array data from a nested array (shown is part of a var_dump):

["passcodes"]=> array(2) { 
    [0]=> array(1) { 
            [0]=> string(33) "pAWn78hI2Uw5FA9iSGVuAkvISM0LTWL9X" 
        } 
    [1]=> array(1) { 
            [0]=> string(33) "dfS7VHqEXmcSkBubESaA0mIt8rEy2fSWE" 
        } 
}

With the following PHP:

<?php
$app = JFactory::getApplication();
$input = $app->input;

$codes= $input->get('passcodes',array(),'array');

echo "*********** ".$codes." **********";
print_r($codes);
var_dump($codes);
var_dump($input);
?>

^^ I can't seem how to figure out the declaration for $codes, it's always null and size 0

Answer 1

Instead of $input->get('passcodes',array(),'array') try:

$vars   = 'passcodes'; // Associative array of keys and filter types to apply
$source = 'youArrayName'; // Array to retrieve data from 
$codes  = $input->getArray(array $vars, $source);