foreach expects an array in a wordpress template - php

Question

Okay I have installed a theme in wordpress that returns a few errors.
Warning: Invalid argument supplied for foreach() in /home/mvprop/public_html/wp-content/themes/yoo_vox_wp/warp/systems/wordpress.3.0/helpers/system.php on line 339
This problem is resolved on these forums
but I can't understand what the last post is about. The guy posts a bunch of random code that solves the problem. He doesn't specify where it's from or where to put it. Just pastes code that doesn't seem to have to do with anything.
line 334 to the end of the file
function getWidgets($position = null) {
if (empty($this->widgets)) {
foreach (wp_get_sidebars_widgets() as $pos => $ids) {
$this->widgets[$pos] = array();
foreach ($ids as $id) {
$this->widgets[$pos][$id] = $this->getWidget($id);
}
}
}
if (!is_null($position)) {
return isset($this->widgets[$position]) ? $this->widgets[$position] : array();
}
return $this->widgets;
}
/*
Function: displayWidget
Checks if a widget should be displayed
Returns:
Boolean
*/
function displayWidget($widget) {
if (!isset($widget->options['display']) || in_array('*', $widget->options['display'])) return true;
foreach ($this->getQuery() as $q) {
if (in_array($q, $widget->options['display'])) {
return true;
}
}
return false;
}
/*
Function: overrideConfig
Overrides default config based on page
Returns:
Void
*/
function overrideConfig() {
if (!count($this->config_overrides)) return;
foreach ($this->getQuery() as $q) {
if (isset($this->config_overrides[$q])) {
$this->warp->config->parseString($this->config_overrides[$q]);
}
}
}
/*
Function: isBlog
Returns:
Boolean
*/
function isBlog() {
return true;
}
/*
Function: isPreview
Checks for default widgets in theme preview
Returns:
Boolean
*/
function isPreview($position) {
// preview postions
$positions = array('logo', 'right');
return is_preview() && in_array($position, $positions);
}
/*
Function: ajaxSearch
Ajax search callback
Returns:
String
*/
function ajaxSearch(){
global $wp_query;
$result = array('results' => array());
$query = isset($_REQUEST['s']) ? $_REQUEST['s']:"";
if (strlen($query)>=3) {
$wp_query->query_vars['s'] = $query;
$wp_query->is_search = true;
foreach ($wp_query->get_posts() as $post) {
$content = !empty($post->post_excerpt) ? strip_tags(do_shortcode($post->post_excerpt)) : strip_tags(do_shortcode($post->post_content));
if (strlen($content) > 255) {
$content = substr($content, 0, 254).'...';
}
$result['results'][] = array(
'title' => $post->post_title,
'text' => $content,
'url' => get_permalink($post->ID)
);
}
}
die(json_encode($result));
}
/*
Function: _adminInit
Admin init actions
Returns:
Void
*/
function _adminInit() {
if ((defined('DOING_AJAX') && DOING_AJAX) && isset($_POST['warp-ajax-save'])) {
// update option values
foreach ($_POST as $option => $value) {
if (preg_match('/^(warp_|'.preg_quote($this->prefix, '/').')/', $option)) {
update_option($option, $value);
}
}
die();
}
wp_enqueue_script('warp-admin', rtrim(get_bloginfo('template_url'),'/').'/warp/systems/wordpress.3.0/js/wp-admin.js', false, '1.0');
add_action('wp_ajax_save_nav_settings', array($this,'_save_nav_settings'));
add_action('wp_ajax_get_nav_settings', array($this,'_get_nav_settings'));
}
/*
Function: _adminHead
Admin head actions
Returns:
Void
*/
function _adminHead() {
// init vars
$path =& $this->getHelper('path');
$head[] = '<link rel="stylesheet" href="'.$path->url('warp:systems/wordpress.3.0/css/admin.css').'" type="text/css" />';
$head[] = '<script type="text/javascript" src="'.$path->url('warp:systems/wordpress.3.0/js/admin.js').'"></script>';
echo implode("\n", $head);
}
/*
Function: _adminMenu
Admin menu actions
Returns:
Void
*/
function _adminMenu() {
// init vars
$path =& $this->getHelper('path');
$name = $this->xml->document->getElement('name');
$icon = $path->url('warp:systems/wordpress.3.0/images/yoo_icon_16.png');
if (function_exists('add_object_page')) {
add_object_page('', $name->data(), 8, 'warp', false, $icon);
} else {
add_menu_page('', $name->data(), 8, 'warp', false, $icon);
}
add_submenu_page('warp', 'Theme Options', 'Theme Options', 8, 'warp', array($this, '_adminThemeOptions'));
add_submenu_page('warp', 'Widget Options', 'Widget Options', 8, 'warp_widget', array($this, '_adminWidgetOptions'));
}
/*
Function: _adminThemeOptions
Render admin theme options layout
Returns:
Void
*/
function _adminThemeOptions() {
// init vars
$path =& $this->getHelper('path');
$xml =& $this->getHelper('xml');
$http =& $this->getHelper('http');
$check =& $this->getHelper('checksum');
// get warp xml
$warp_xml = $xml->load($path->path('warp:warp.xml'), 'xml', true);
// update check
$update = null;
if ($url = $warp_xml->document->getElement('updateUrl')) {
// get template info
$template = get_template();
$version = $this->xml->document->getElement('version');
$url = sprintf('%s?application=%s&version=%s&format=raw', $url->data(), $template, $version->data());
// only check once a day
if (get_option($this->prefix.'update_check') != date('Y-m-d').' '.$version->data()) {
if ($request = $http->get($url)) {
update_option($this->prefix.'update_check', date('Y-m-d').' '.$version->data());
update_option($this->prefix.'update_data', $request['body']);
}
}
// decode update response
$update = json_decode(get_option($this->prefix.'update_data'));
}
// verify theme files
if (($checksums = $path->path('template:checksums')) && filesize($checksums)) {
$check->verify($path->path('template:'), $log);
} else {
$log = false;
}
echo $this->warp->template->render('admin/theme_options', array('xml' => $this->xml, 'warp_xml' => $warp_xml, 'update' => $update, 'checklog' => $log));
}
/*
Function: _adminWidgetOptions
Render admin widget options layout
Returns:
Void
*/
function _adminWidgetOptions() {
// get position settings
$position_settings = $this->warp->config->get('warp.positions');
// get module settings
$module_settings = array();
$settings = $this->xml->document->getElement('modulesettings');
foreach ($settings->children() as $setting) {
$module_settings[$setting->attributes('name')] = $setting;
}
echo $this->warp->template->render('admin/widget_options', compact('position_settings', 'module_settings'));
}
/*
Function: getMenuItemOptions
Retrieve menu by id
Parameters:
$id - Menu Item ID
Returns:
Array
*/
function getMenuItemOptions($id) {
$menu_settings = array(
'columns' => 1,
'columnwidth' => -1,
'image' => ''
);
if (isset($this->menu_item_options[$id])) {
$menu_settings = array_merge($menu_settings, $this->menu_item_options[$id]);
}
return $menu_settings;
}
/*
Function: _save_nav_settings
Saves menu item settings
Returns:
Void
*/
function _save_nav_settings() {
if (isset($_POST['menu-item'])) {
$menu_item_settings = $this->menu_item_options;
foreach ($_POST['menu-item'] as $itemId=>$settings){
$menu_item_settings[$itemId] = $settings;
}
update_option($this->prefix.'menu-items', $menu_item_settings);
$this->menu_item_options = $menu_item_settings;
}
die();
}
/*
Function: _get_nav_settings
Returns menu item settings as json
Returns:
Boolean
*/
function _get_nav_settings() {
die(json_encode($this->menu_item_options));
}
}
/*
Function: mb_strpos
mb_strpos function for servers not using the multibyte string extension
*/
if (!function_exists('mb_strpos')) {
function mb_strpos($haystack, $needle, $offset = 0) {
return strpos($haystack, $needle, $offset);
}
}

Answer 1

Basically what this warning message tells you is that the variable you're passing into your foreach is not an array or object. Make sure your variable is valid by testing it ( is_array($var) or is_object($var) ) or placing this block of code in a try-catch.
If $var is supposed to be an array, you should also initialize it just to be certain.
$var = Array();
.
. // code that may change the data type of $var
.
if (is_array($var)) {
foreach($var as $v) {
//code here
}
}
From the manual at http://php.net/manual/en/control-structures.foreach.php:
The foreach construct provides an easy way to iterate over arrays. foreach works only on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable.