WordPress – Get SVG image dimensions

Add this code to your functions.php file to add the dimensions to the image object array for svgs.

add_filter( 'wp_get_attachment_image_src', 'fix_wp_get_attachment_image_svg', 10, 4 );

 function fix_wp_get_attachment_image_svg($image, $attachment_id, $size, $icon) {
    if (is_array($image) && preg_match('/\.svg$/i', $image[0]) && $image[1] <= 1) { if(is_array($size)) { $image[1] = $size[0]; $image[2] = $size[1]; } elseif(($xml = simplexml_load_file($image[0])) !== false) { $attr = $xml->attributes();
            $viewbox = explode(' ', $attr->viewBox);
            $image[1] = isset($attr->width) && preg_match('/\d+/', $attr->width, $value) ? (int) $value[0] : (count($viewbox) == 4 ? (int) $viewbox[2] : null);
            $image[2] = isset($attr->height) && preg_match('/\d+/', $attr->height, $value) ? (int) $value[0] : (count($viewbox) == 4 ? (int) $viewbox[3] : null);
        } else {
            $image[1] = $image[2] = null;
        }
    }
    return $image;
}

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