I've been getting the following error for awhile now, but I can't 
figure out why it's happening:

Invalid argument supplied for foreach() in ... sample.php on line 377

        Here's that portion of code:


// Check if Zip Code matches from states_zipcodes
$zip_short = substr($zip, 0, 3);
foreach ($states[$state] as &$zip_prefix) {   // <-- line 377
    if ($zip_prefix == $zip_short) {
    } else {
        $match = 'no';

        It doesn't happen all the time, so I'm thinking that some spambot is 
populating the HTML form with something the script doesn't like(?).  However, I 
tested that myself by entering text, or by entering just 2 digits, but there 
was no error.  FYI, I do have code in the script that catches faulty input and 
warns people in their browser to go back and re-enter the correct data, so I'm 
at a loss as to why this is happening.

        How can I see what's triggering this to happen?  I have the following 
line in my php.ini:

error_reporting = E_ALL & E_STRICT & E_NOTICE & E_DEPRECATED

Thank you,
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