How can you format text as bold in the body of an email sent using PHP?

To format text as bold in the body of an email sent using PHP, you can use HTML tags within the email content. Simply wrap the text you want to make bold with <b> and </b> tags. This will apply the bold formatting to the specified text when the email is rendered by the recipient's email client.

&lt;?php
$to = &#039;recipient@example.com&#039;;
$subject = &#039;Example Email with Bold Text&#039;;
$message = &#039;&lt;html&gt;&lt;body&gt;&lt;p&gt;This is an &lt;b&gt;example&lt;/b&gt; email with bold text.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;&#039;;
$headers = &#039;MIME-Version: 1.0&#039; . &quot;\r\n&quot;;
$headers .= &#039;Content-type: text/html; charset=iso-8859-1&#039; . &quot;\r\n&quot;;
$headers .= &#039;From: sender@example.com&#039; . &quot;\r\n&quot;;

mail($to, $subject, $message, $headers);
?&gt;