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Javascript command inserted by php


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I'm using this code

 <?php if (isset($_POST["json"])) : ?>
loadfile('<?php echo $_POST["json"] ?>');  
 <?php endif; ?>

to insert a command into my scrjavascript script and it appears like this:


But I get a message for the loadfile line "Uncaught SyntaxError: Invalid or unexpected token". I can't see anything wrong. Why am I getting this error?

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5 hours ago, Ingolme said:

It is probably that there is a quotation mark in the JSON contents.

Yes, there are loads.

It seems that if I remove the single quotes around the php command the error goes away. I don't actually understand why they were there in the first place.

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