- substr: documentation ( source)
- var_dump: documentation ( source)
- strpos: documentation ( source)
<?php
$str = 'data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAA...';
function getB64Type($str) {
return substr($str, 5, strpos($str, ';')-5);
}
var_dump(getB64Type($str));