strcmp is not working expectedly in PHP - php

Question

I am setting a session variable in a php file as:
$_SESSION['PageFrom']="check_login_test.php";
Later on the control is transferred to another php file via a form and post. The relevant code in the 2nd file is:
session_start();
$from=trim($_SESSION['PageFrom']);
pageFrom("check_login_test.php",$from);
die('I came here');
Now pageFrom is a function that should have compared the strings and said so. The original function was simply
function oldPageFrom($page,$from)
{
$page= trim($page);
$from=trim($from);
if (strcmp($page,$from)!==0)
{
echo 'The pages are not same';
}
}
Since it did not work as expected, I tried to debug the same and output as much as I can (This changed the old function, but now reveals some things interesting) . The function is
function pageFrom($page,$from)
{
echo '<br/>$page='.$page;
echo '<br/>$from='.$from;
$m=trim($page);
$n=trim($from);
echo "<br/>TrimmedPage=$m<br/>TrimmedFrom=$n";
$k= strcmp($m,$n);
echo '$k='.$k;
if($k !==0);
{
$i=strlen($from);
$j=strlen($page);
if ($i==$j)
{
echo "<br/>The string lengths are Equal $i=$j";
die('Equal in unequal');
}
else
{
echo "<br/>The string lengths are UnEqual $i<>$j";
die('UnEqual in unequal');
}
}
echo 'Works as expected. They are equal'; die('equal');
}
Strangely I get the following as output:
$page=check_login_test.php
$from=check_login_test.php
TrimmedPage=check_login_test.php
TrimmedFrom=check_login_test.php$k=0
The string lengths are Equal 20=20Equal in unequal
So the questions are:
(1)I have trimmed the strings. They are equal and of the same length. Strcmp returns 0. Then why does it enter the loop if($k !==0) at all? Note: no luck in ($k!=0) too.

Answer 1

You're using the following code:
if($k !==0);
{
The semi-colon (;) terminates the if clause and the subsequent { } block won't have any effect. Remove the ; after if and it will work as it should, i.e. this code below
if($k !==0)
{