title: Can I blindly replace all mysql_ functions with mysqli_?
body: <p>I have used <code>mysql_query()</code> throughout my project; but I've just learned that <code>mysql_</code> was deprecated as of PHP 5.5, has been removed in PHP 7.</p>
  
  <p>So, I would like to know if I can replace all <code>mysql_</code> functions with <code>mysqli_</code> in my project blindly? For example, just replacing <code>mysql_query()</code> with <code>mysqli_query()</code>. Is there any adverse effect?</p>