How to apply the concept of PHP explode on tinyMCE textarea?

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I was able to do this with a regular textarea, using PHP explode:

if (isset($_GET["submitannouncements"]) == "GET")
{
    $arry=explode( "\r\n, $_GET['announcementtext']);

    for ($i = 0; $i < 5; $i++)
   {
       $sql = "UPDATE tblannounce SET content = '".addslashes($arry[$i])."' WHERE id = ".++$i;
       mysqli_query($conn, $sql);
   }
}

How can I possibly do this if I'm now using tinyMCE?