How to add php and html code in footer.php in beaver child theme

We have added a html code for footer in beaver builder child theme, but when we insert the php code from parent theme footer.php, into the child theme, there is a conflict, hamburger menu is not working

If you need to modify the footer template file then like all WordPress child themes you copy the footer.php file from the parent theme to the child theme then make your edits. WordPress will then use that footer.php instead of the parent theme one.

I did the same as you said , but inserted few html code in the php file but by adding html code the hamburger menu is not working