When replacing placeholders with dynamic links in PHP-generated HTML emails, what considerations should be taken into account to prevent link display issues?

When replacing placeholders with dynamic links in PHP-generated HTML emails, it's important to ensure that the links are properly formatted to prevent display issues. One common issue is when the link is not enclosed within quotation marks, which can cause the link to display incorrectly or break altogether. To solve this, make sure to enclose the dynamic link within double quotes when replacing the placeholder in the HTML email template.

// Example code snippet to replace a placeholder with a dynamic link in an HTML email template
$link = "https://example.com";
$html_email = "<p>Click <a href=\"$link\">here</a> to visit our website.</p>";

// Send the HTML email with the dynamic link
// (code to send email not shown here)