PHP/jQuery to submit/save input with all special characters value

Question

Example..

HTML :

<input type="hidden" value="">

PHP :

<input type="hidden" value="<?php echo $value;?>">

jQuery :

$("input:hidden").val(text);

If text (JS variable) is free text, All html special characters allowed (like single quote / double quote) and save to input:hidden (so submit by PHP)

What is a correctly way to do ?

May I use

echo htmlentities($value); ... in PHP

or replace quotes in jQuery like .val(text.replace(/'/g,"'"))

or what ?

PS : Please think about when I set value to input to save value with jQuery too.

Answer 1

Converting to htmlentities should work fine.

You can also use strip_tags if you want to remove all HTML tags :

Note: this will NOT stop all XSS attacks

Answer 2

If you want to echo a PHP variable into some HTML, use:

<input type="hidden" value="<?php echo htmlspecialchars($value); ?>">

http://php.net/manual/en/function.htmlspecialchars.php

If you want to echo a PHP variable into some JavaScript, use:

<?php echo json_encode($value); ?>

http://php.net/manual/en/function.json-encode.php