PHP page jump handling problems-great God

PHP page jump handling problems-when A master enters A page A, click the B page link to jump to page B, Page B is processed through php code, meet the conditions, display B night html code, page A does not conform to the requirements of page A. At this time, A blank page appears after Page A is clicked. how to handle this problem? Page B jumps back to page A and page B is closed. when Page A is clicked back, no blank page appears, [how to redirect the PHP page in the browser to solve the problem -- go to the top
When the link on page B on page A jumps to page B, Page B is processed by php code and meets the conditions. html code on page B is displayed, but not on page;

Click page A and A blank page is displayed;

How to deal with B page jump back to A page, B page is closed, when Page A is rolled back, no blank page appears
------ Solution --------------------
[How to invalidate the button in the browser]