Fatal error: [] operator not supported for string error on PHP Array in for loop

Question

I have this PHP Code:

for($i=1; $i<=$_POST[\"counter\"]; $i++)
{
    if($_POST[\"checkbox$i\"])
    {
        //select the billing_pdf row
        $sql=\"SELE         


        

Answer 1

You have already used $emails_list as a string some where in your page like $emails_list = 7;

and again using it like

$emails_list[] = array(1,2,4);

Answer 2

you fill the array $emails_list[] in the second while with $contacts2["email"]. in the next line, you implode the array to a string.

for the next result (first while loop) $emails_list is a string. now you can't convert a string to an array

try this:

        $emailsListData = array();
        while($contacts2=mysql_fetch_array($rs2))
        {
            //generate the list of emails address in an array
            $emailsListData[] = $contacts2["email"];
        }
        $emails_list = implode(',',$emailsListData);