How to encode PHP string of HTML for use as string by JavaScript function? -

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i've got following code:

<iframe id="uniqueid" frameborder="0" width="100%" height="100%"></iframe> <script>     var iframeobject = document.getelementbyid("uniqueid");     var iframecontent = iframeobject.contentwindow.document;     iframecontent.open();     iframecontent.write("<?php echo $htmlstring ?>");     iframecontent.close(); </script>;

i'm trying insert user-generated html (metadata, <html>, <head>, <body>, <script>s , all), stored string in php variable $htmlstring, #uniqueid iframe browser/client render.

i'm having hard time figuring out proper way safely escape/encode string of html use in javascript i've written.

on php side, i've tried htmlspecialchars(), htmlentities(), json_encode(), , simple str_replace()s on $htmlstring, none of them need them to. there i'm missing?

i think should save code file , loads src attribute domain.

at least jsfiddle.net uses way.


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