Including not working , is it too many includes? - php

Question

Hi StackOverFlow members.
I need a favor regarding my programming script.
I'm stunned trying out different various ways to make my code more simpler.
Before I tried to make things simpler . The code works great and it able to do the function.
Here goes:
Detection PHP which worked on a HTML previously before I tried to tweak it a little:
<?php
include 'Mobile_Detect.php';
$detect = new Mobile_Detect();
if ($detect->isMobile()) {
header('Location: http://facebook.com');
exit(0);
}
?>
<b> Testing / This is not a supported page for mobile </b>
This code works like a charm. When I'd use the browser to access the following page.
It shows me the message "Testing / This is not a supported page for mobile ".
When I'd used a mobile phone to access it , it works like a charm and redirect me back to Facebook.
So this is the new problem that I faced .
I just removed the PHP from the HTML and put it in a file called "detection.php"
<?php
include 'detection.php';
?>
<b> hello </b>
<p> testing on anarchy </p>
But this time , when I used the web browser to access the site , it showed me the message
"Testing on anarchy" and when I used the mobile as well. It still redirect me to the same page
"Testing on anarchy".
How do we make it in a way where you just need to include the PHP files on the HTML header rather than writing the PHP code on the HTML page.
Any idea?

Answer 1

Try Using: you have to use the brackets ('page');, and you should not repeat any code as you are already calling the code from another page, so all you add is:
<?php
include('Mobile_Detect.php');
?>
and on the mobile_detect.php page add:
<?php
$detect = new Mobile_Detect();
if ($detect->isMobile()) {
header('Location: http://facebook.com');
exit(0);
}
?>

Answer 2

Always use "require" instead of "include".
"require" throws a Fatal Error if the function doesn't find the file, and the script is halted.
"include" throws a Warning if the function doesn't find the file and the script continue to run, which means that you might not notice this bug if you turned off the PHP errors.
Also rely on "require_once" to avoid problems such as "Cannot redeclare function" or "Cannot redeclare constant" etc.
Also, if you're using "header()" you need to make sure you're not using "print" or "echo" prior to the "header" function. Otherwise, you'll get the "headers already sent" error.
To debug your problem, you should use "require_once" and then you should check if it fails. If it fails, then you probably have a problem with your path.