What are the potential issues with sending HTML emails with CSS styling using PHP?

One potential issue with sending HTML emails with CSS styling using PHP is that many email clients do not fully support CSS. To ensure consistent styling across different email clients, inline CSS should be used instead of external stylesheets. This can be achieved by using PHP to dynamically generate inline CSS styles within the HTML email template. 

<?php
// Define your CSS styles as an associative array
$styles = [
    'body' => 'background-color: #f1f1f1; font-family: Arial, sans-serif;',
    'h1' => 'color: #333333; font-size: 24px;'
];

// Generate inline CSS styles
$css = '';
foreach ($styles as $selector => $style) {
    $css .= "$selector { $style } ";
}

// HTML email template with inline CSS
$email_template = "
<!DOCTYPE html>
<html>
<head>
    <style>
        $css
    </style>
</head>
<body>
    <h1 style='color: #333333; font-size: 24px;'>Hello World!</h1>
    <p style='color: #666666;'>This is a test email.</p>
</body>
</html>
";

// Send email with PHP mail function
$to = 'recipient@example.com';
$subject = 'Test Email';
$headers = 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
mail($to, $subject, $email_template, $headers);
?>

Keywords

HTML emails CSS styling PHP mail function email clients rendering issues

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