Does a blank space sent to the browser before header statement get ignored?

[sedigh mohseni]

hi

I write a simple script for test header statement.I expect my script show a warning message and dont transmit to another page but unfortunately, i am transmited to another page.
my question is this, is there any setting in php.ini that is related with blank space that is sent to the browser before header statement .
my experimental script is as follow as:

<?php 
ini_set("error_reporting", E_ALL);
ini_set("display_errors", "on");
?>
 <?php
$a = 'ali';
 
     if($a == 'ali') {
         header("Location: index2.php");
     }
?>
<h1>you dont transmit to another page</h1>
 

thanks alot for your help.

[HaLo2FrEeEk]

You haven't echoed anything in your script before you call the header() function.

Also:

<?php  
ini_set("error_reporting", E_ALL); 
ini_set("display_errors", "on"); 
?> 
 <?php

No need to end the code block then start it again immediately after, remove the end of the first one and the start of the second one.

Basically, you haven't output anything, so your script is working as it should. This would fail (most times):

<?php  
ini_set("error_reporting", E_ALL); 
ini_set("display_errors", "on"); 
$a = 'ali'; 
echo $a;
if($a == 'ali') { 
  header("Location: index2.php"); 
  } 
?>

There are certain setups on which this would still work.

[sedigh mohseni]

hi

i close php tag and open it again deliberately because i expect to get a warning or notice for a space between closing and opening tag that is sent to browser and i dont must transmit to next page.
thanks alot

[HaLo2FrEeEk]

If you don't want to redirect then remove the redirect code.