Question

I need help suppressing a warning that I am getting from a foreach()

Warning: Invalid argument supplied for foreach() in 
/sitename/pages/admin/questions/index.php

I am getting the result I want. All I need is to remove the warning…

This is my code:

for($i = 1; $i <= $RESULTS_count; $i++){

$rawResult = $wpdb->get_row(
                $wpdb->prepare("SELECT * FROM ".WPSQT_TABLE_RESULTS." WHERE id = $i"),ARRAY_A);

$rawResult['sections'] = unserialize($rawResult['sections']);

     foreach($rawResult['sections'] as $result_sections){
         if($result_sections['answers'][1]['mark'] == 'correct') $correct_answer++;
    }
}
echo $correct_answer/$RESULTS_count;

If I take the code out of the FOR loop and replace WHERE id = $i with WHERE id = 1 it will work… Could the problem be FOREACH does not like being in FOR loop?

What do you think I should do?

EDIT: I think the warning I was getting was caused by the fact that I deleted the result with ID 2, so when loop over the table rows one of them is empty and that is way I am getting the Warning…

Answer 1

You should ensure the data is an array first or typecast it to an array.

Is array:

    if (is_array($rawResult['sections'])) {
        foreach ($rawResult['sections'] as $result_sections) {
            if ($result_sections['answers'][1]['mark'] == 'correct')
                $correct_answer++;
        }
    }

Typecast:

    foreach ( (array) $rawResult['sections'] as $result_sections) {
        if ($result_sections['answers'][1]['mark'] == 'correct')
            $correct_answer++;
    }