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<!DOCTYPE html>
<html>
<body>
<?php
$str = "Who's Peter Griffin?";
echo $str . " This is not safe in a database query.<br>";
echo addslashes($str) . " This is safe in a database query.";
?> 
</body>
</html>
Who's Peter Griffin? This is not safe in a database query.
Who\'s Peter Griffin? This is safe in a database query.