How can external content blocking affect the display of images in HTML emails sent via PHP?

External content blocking can prevent images from being displayed in HTML emails sent via PHP if the email client blocks external image URLs. To ensure images are displayed, you can embed the images directly into the email using base64 encoding. This way, the images are included within the email itself, rather than being loaded externally. 

// Function to embed image as base64 in HTML email
function embedImage($imagePath) {
    $imageData = file_get_contents($imagePath);
    $base64Image = base64_encode($imageData);
    $imageType = pathinfo($imagePath, PATHINFO_EXTENSION);
    $imgSrc = 'data:image/' . $imageType . ';base64,' . $base64Image;
    
    return $imgSrc;
}

// Example usage
$imagePath = 'path/to/your/image.jpg';
$imgSrc = embedImage($imagePath);

// Include $imgSrc in your HTML email as the source of the image

Keywords

PHP HTML emails external content blocking image display email deliverability

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