Convert Uploaded Images to WebP

Author: Kev Quirk |  Hook: on_image_uploaded

Automatically converts uploaded images to WebP format and resizes them to a maximum of 1200px wide on upload. Requires the PHP gd extension.

Supports JPEG, PNG, WebP, and GIF source images. The original file is replaced by the converted WebP.

function on_image_uploaded(string $path): void
{
    if (!extension_loaded('gd')) {
        return;
    }

    $mime  = mime_content_type($path) ?: '';
    $image = match ($mime) {
        'image/jpeg' => imagecreatefromjpeg($path),
        'image/png'  => imagecreatefrompng($path),
        'image/webp' => imagecreatefromwebp($path),
        'image/gif'  => imagecreatefromgif($path),
        default      => false,
    };
    if ($image === false) {
        return;
    }

    $origW = imagesx($image);
    $origH = imagesy($image);

    if ($origW > 1200) {
        $newH    = (int) round($origH * 1200 / $origW);
        $resized = imagescale($image, 1200, $newH);
        imagedestroy($image);
        if ($resized === false) {
            return;
        }
        $image = $resized;
    }

    $webpPath = preg_replace('/\.[^.]+$/', '.webp', $path) ?? $path;
    imagewebp($image, $webpPath, 82);
    imagedestroy($image);

    if ($webpPath !== $path) {
        unlink($path);
    }
}

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