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I needed to pass along a variable to an iframe. I have a page that displays data by a search string entered (separate directory on server)

Example: query/page.php?search_string=1234

In order to pass that variable I used html at the top of page that holds the iframe
(EXAMPLE WYSI PAGE would be search.php.)

<?php
//PASS THE SEARCH VARIABLE TO IFRAME URL TOP OF THE PAGE search.php
$search_string=($_GET["query"]);
$redirect="query/page.php?search_string=$search_string";
?>

Then for the iframe target in Wysi:
<?php print("$redirect");?>

You can call the wysi page.
search.php?query="your variable here"

You can also pass dynamic keywords, titles etc to the iframe target