Each time a page is opened, a code segment is randomly operated. Other code segments that do not run

Each time a page is opened, a piece of code is run randomly. Other code segments that do not run are randomly run on each open page. Other sections do not run code. when a user opens a website, one of the several ad codes is displayed. when another page is opened, another ad code is displayed again. Find the code, PHPcode $ rd = rand (); each time the page is opened, a piece of code is run randomly. Other code segments that do not run,
Each time a page is opened, a piece of code is run randomly. Other sections do not run code

The user opens the website

Display one of several ad codes

Open another page

Display another advertisement code. Code

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PHP code

$ Rd = rand (1111); switch ($ rd) {case 1: echo "2222"; break; case 2: echo ""; break; case 3: echo "3333"; case 4: echo "4444"; break; default: echo "sorry"; break ;}