How can PHP developers ensure that links in HTML emails are properly formatted and displayed in email clients?

When sending HTML emails with PHP, developers should ensure that links are properly formatted using absolute URLs with the full http:// or https:// protocol. This ensures that email clients can correctly display the links. To achieve this, developers can use the PHP function "filter_var" with the FILTER_VALIDATE_URL filter to validate and sanitize the URL before including it in the email content. 

// Example code to validate and sanitize a URL before using it in an HTML email
$url = 'example.com'; // URL to be included in the email
if (filter_var($url, FILTER_VALIDATE_URL)) {
    $formatted_url = filter_var($url, FILTER_SANITIZE_URL);
    // Include $formatted_url in the HTML email content
} else {
    // Handle invalid URL
    echo 'Invalid URL';
}

Keywords

PHP HTML emails link formatting email clients display issues

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