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<?php
$str = "This is some <b>bold</b> text.";
echo htmlspecialchars($str);
?>

<!DOCTYPE html>
<html>
<body>
This is some &lt;b&gt;bold&lt;/b&gt; text.
</body>
</html>

This is some <b>bold</b> text.

<?php
$str = "Jane & 'Tarzan'";
echo htmlspecialchars($str, ENT_COMPAT); // Encodes double quotes only
echo "<br>";
echo htmlspecialchars($str, ENT_QUOTES); // Encodes both double and single quotes
echo "<br>";
echo htmlspecialchars($str, ENT_NOQUOTES); // Does not encode any quotes
?>

<!DOCTYPE html>
<html>
<body>
Jane &amp; 'Tarzan'<br>
Jane &amp; 'Tarzan'<br>
Jane &amp; 'Tarzan'
</body>
</html>

Jane & 'Tarzan'
Jane & 'Tarzan'
Jane & 'Tarzan'

<?php
$str = 'I love "PHP".';
echo htmlspecialchars($str, ENT_QUOTES); // Encodes both double and single quotes
?>

<!DOCTYPE html>
<html>
<body>
I love &quot;PHP&quot;.
</body>
</html>

I love "PHP".