How to make a link in php?

I apologize in advance for a probably ridiculous and not very well-posed question, it’s just that in PHP I’m a complete 0.
So the crux of the matter is:
there is a certain html page divided into three parts (I think it’s called a tray if I’m not mistaken), each of these parts corresponds to a .php file. In the admintray.php file (the central part of the html page) I insert a link, here is the code:

print("<p><b><a href='http://ip_/cgi-bin/'><img src='1.jpg' alt='' border='0' /><br></a></b></p>");

The link appears, the transition occurs, but the page to which the transition is made opens, as it were, in one part of the page from which the transition was made (in the admintray in general), in general, I remain on the page on which I was. How to make a “full” transition?

Answer 1, authority 100%

<a href="..." target="_top">...</a>

Answer 2, authority 50%

It’s called a frame! Each frame is assigned its own name. The page opens in the frame whose name is indicated (as suggested by the respected ling) in the target attribute. For example: we have two frames:

  <frame src="menu.html" name="menu">
  <frame src="main.html" name="main">

If the link is in a “menu” frame, and contains the target=”main” attribute, then when clicked, the result will open in the “main” frame.
This attribute may contain the following service values:

_blank – opens the page in a new window.
_self – opens the page in the window where the link is clicked.
_parent – opens the page in the parent frame, if the page is without frames it works like _self
_top – opens the page on top of all frames, if the page is without frames it works like _self