php - Does urlencode() protect against XSS -


$address , $citystate user provided, stored in db, , available others view shown below. there risk of xss? should htmlspecialchars() used on it?

<img src="http://maps.google.com/maps/api/staticmap?markers=color:blue|<?php echo(urlencode($address.' '.$citystate));?>&amp;zoom=14&amp;size=400x400&amp;sensor=false" alt="map" />

there no magic wand php function protect all. every protection 100% safe till day hacked. need understand , how site can hacked , improve protection every day.

you can interesting tips article xss prevention.

also php.net urlencode documentation:

<?php $query_string = 'foo=' . urlencode($foo) . '&bar=' . urlencode($bar); echo '<a href="mycgi?' . htmlentities($query_string) . '">'; ?>

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