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https://www.w3schools.com/tags/tag_doctype.asp

Apart from where it will only show the last option everytime. (.= required to append each option) $statelist .= "<option value='".$states."'>".$states."</option>";

MDN has a good description of image formats and what they're good for: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#supported_image_formats Personally, I find PNG to be the most reliable format for complex images. While WebP has slightly better compression, it is not as widely supported by browsers, though all the biggest browsers support it. SVG is good for simple shapes, since it is a vector format. It is ideal for icons, logos and similar images.