How to set HTML value attribute (with spaces)

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Quote it. Otherwise the space will just become an attribute separator and everything after spaces will be seen as element attributes. Rightclick page in webbrowser and view source. It should not look like this (also see syntax highlight colors):

<input value=Big Ted>

but rather this

<input value="Big Ted">

Not to mention that this would still break when someone has a quote in his name (and your code is thus sensitive to XSS attacks). Use htmlspecialchars().

Kickoff example:

<input value="<?php echo (isset($_POST['username']) ? htmlspecialchars($_POST['username']) : ''); ?>">

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