PHP Warning: Invalid argument supplied for foreach()

Question

Why am I getting this PHP Warning?

Invalid argument supplied for foreach()

Here is my code:

// look for text file for this keyword if (empty($site["textdirectory"])) {     $site["textdirectory"] = "text"; } if (file_exists(ROOT_DIR.$site["textdirectory"].'/'.urlencode($q).'.txt')) {     $keywordtext =       file_get_contents(ROOT_DIR.$site["textdirectory"].'/'.urlencode($q).'.txt'); } else {     $keywordtext = null; }  $keywordsXML = getEbayKeywords($q);  foreach($keywordsXML->PopularSearchResult as $item) {     $topicsString = $item->AlternativeSearches;    $relatedString = $item->RelatedSearches;    if (!empty($topicsString)) {         $topics =  split(";",$topicsString);     }     if (!empty($relatedString)) {         $related = split(";",$relatedString);     }  }  $node = array(); $node['keywords'] = $q; 

2

$xml = ebay_rss($node);  $ebayItems = array(); $totalItems = count($xml->channel->item);  $totalPages = $totalItems / $pageSize;   $i = 0; foreach  ($xml->channel->item as $item) {   $ebayRss =      $item->children('http://www.ebay.com/marketplace/search/v1/services');      if ($i>=($pageSize*($page-1)) && $i<($pageSize*$page)) {         $newItem = array();         $newItem['title'] = $item->title;         $newItem['link'] = buyLink($item->link, $q);         $newItem['image'] = ebay_stripImage($item->description);         $newItem['currentbid'] = ebay_convertPrice($item->description);         $newItem['bidcount'] = $ebayRss->BidCount;         $newItem['endtime'] = ebay_convertTime($ebayRss->ListingEndTime);         $newItem['type'] = $ebayRss->ListingType;         if (!empty($ebayRss->BuyItNowPrice)) {             $newItem['bin'] = ebay_convertPrice($item->description);         }         array_push($ebayItems, $newItem);     }     $i++; }   $pageNumbers = array(); for ($i=1; $i<=$totalPages; $i++) {     array_push($pageNumbers, $i); } 

3

// get user guides $guidesXML = getEbayGuides($q); $guides = array(); foreach ($guidesXML->guide as $guideXML) {     $guide = array();     $guide['url'] = makeguideLink($guideXML->url, $q);     $guide['title'] = $guideXML->title;     $guide['desc'] = $guideXML->desc;     array_push($guides,$guide); } 

What causes this warning?

Answer 1

You should check that what you are passing to foreach is an array by using the is_array function

If you are not sure it's going to be an array you can always check using the following PHP example code:

if (is_array($variable)) {    foreach ($variable as $item) {    //do something   } }