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

<!DOCTYPE html>
<html>
<body>
This is some <b>bold</b> text.
</body>
</html>

This is some bold text.

<?php
$str = "Jane &amp; 'Tarzan'";
echo htmlspecialchars_decode($str, ENT_COMPAT); // Default, decodes double quotes only
echo "<br>";
echo htmlspecialchars_decode($str, ENT_QUOTES); // Decodes both double and single quotes
echo "<br>";
echo htmlspecialchars_decode($str, ENT_NOQUOTES); // Does not decode any quotes
?>

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

<?php
$str = 'I love &quot;PHP&quot;.';
echo htmlspecialchars_decode($str, ENT_QUOTES); // Decodes both double and single quotes
?>

<!DOCTYPE html>
<html>
<body>
I love "PHP".
</body>
</html>

I love "PHP".