PHP isset tests

isset_test

<?php
error_reporting(E_ALL | E_STRICT);
ini_set('display_errors', '1');

define('LANGUAGE_NONE', 'und');

echo "<pre>";

// Test an object with an array as a property.
if (isset($node->field[LANGUAGE_NONE][0]['value'])) {
  echo "Object set\n";
}
else {
  echo "Object not set\n";
}

$node = new stdClass();
$node->field = array();
$node->field[LANGUAGE_NONE][0]['value'] = 'foo';

if (isset($node->field[LANGUAGE_NONE][0]['value'])) {
  echo "Object set\n";
}
else {
  echo "Object not set\n";
}

// Test previous object in an array.
if (isset($form['node']->field[LANGUAGE_NONE][0]['value'])) {
  echo "Object in array set\n";
}
else {
  echo "Object in array not set\n";
}

$form['node'] = $node;

if (isset($form['node']->field[LANGUAGE_NONE][0]['value'])) {
  echo "Object in array set\n";
}
else {
  echo "Object in array not set\n";
}

echo "</pre>";