How can PHP developers ensure that their HTML emails are displayed correctly across different email clients, considering limitations in CSS support and rendering differences?

PHP developers can ensure their HTML emails are displayed correctly across different email clients by using inline styles instead of external CSS, avoiding complex layouts and relying on tables for structure, testing the email in various email clients, and using tools like Litmus or Email on Acid for further testing and optimization. 

<?php
$to = 'recipient@example.com';
$subject = 'Testing HTML email';
$message = '
<html>
<head>
<style>
/* Put inline styles here */
</style>
</head>
<body>
<p>This is a test email.</p>
</body>
</html>
';
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
mail($to, $subject, $message, $headers);
?>

Keywords

PHP HTML emails email clients CSS support rendering differences

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