Why the code execute after redirection

Question

Why the execution goto after redirection using header()

  $flag=1;
  if($flag==1)
      header("Location:page1.php");
  header("Location:page2.php");

when use this code page redirects to page2.php, Why its happen

Answer 1

You need to put an exit; after the header call; PHP does not automatically stop executing code after the client stops loading the page.

Answer 2

The code should be like:-

$flag=1;
if($flag==1) {
    header("Location:page1.php");
    exit();
}
header("Location:page2.php");
exit();

If you don't use the "exit()" / "die()" construct, PHP will continue to execute the next lines. This is because PHP redirects the user to the first-mentioned page (in this case it's "page1.php"), but internally after executing all the statements written in the whole page, even after the "header()" method is executed. To stop this, we need to use either the "exit()" / "die()" constructs.

Hope it helps.