Invalid argument supplied for foreach in Internet Explorer only - php

Question

Why is this warning occuring when I am using IE?
Warning: Invalid argument supplied for foreach()
It works in all other browsers..
The function for the loop:
function wdsearch(PDO $dbh){
if(!isset($_POST['wdsubmit'])) {
} else {
$term = $_POST['wdsearchvalue'];
$stmt = $dbh->prepare("
SELECT *
FROM posts
WHERE category = :designer
AND (full_text LIKE CONCAT('%', :term, '%')
OR heading LIKE CONCAT('%', :term, '%'))
ORDER BY post_date DESC
");
$designer = 'Designer';
$stmt->bindParam(":designer", $designer);
$stmt->bindParam(":term", $term);
$stmt->execute();
return $stmt->fetchAll();
}
}
wdsearch($dbh);
$wdsearch = wdsearch($dbh);
And the loop goes here..
<?php foreach($wdsearch as $wds) : ?>
<!-- HTML here -->
<?php endforeach; ?>
Any possible IE related warnings? Like I said all other browsers can handle it..

Answer 1

The problem is in your wdsearch function; if $_POST['wdsubmit'] is not set, it returns nothing and if anything goes wrong in any of the db operations it will not return an array either.
You need to add some error handling to your db operations and in case of failure or a non-post, return an empty array and / or check if $wdsearch is an array before you use foreach.

Answer 2

The specified error is occurring in your PHP code, not in any specific browser.
The issue is, the datatype of $wdsearch, does not implement an iterator. This could be caused by $wdsearch being null, a string/number/etc. - or simply an unsupporting object.
Try verifying if the data is an array before going into the foreach loop with is_array($wdsearch), or verify the variable is not null with isset($wdsearch). If you believe there is valid data there, check to see if the object in $wdsearch actually supports iterators and, if not, update it to implement!
Example:
<?php
if (isset($wdsearch)):
foreach($wdsearch as $wds) :
?>
<!-- HTML here -->
<?php
endforeach;
endif;
?>

Answer 3

If for the same parameters it works in Chrome and FF, but not IE.
What are exactly are you submitting in IE. Is there some silly thing like a button with picture submit? That would pass your terms as the location of the click, not actual value for example.
Debug what your incoming parameters in $POST are before outputting to foreach. Also how do you handle null result sets?