Quick Answer

Redirect users to different pages.

Understanding the Issue

PHP provides several methods to redirect users while ensuring no output is sent before headers.

The Problem

This code demonstrates the issue:

Php Error 
echo "Content";
header("Location: newpage.php"); // Fails

The Solution

Here's the corrected code:

Php Fixed 
// Proper redirection
header("Location: newpage.php");
exit;

// Output buffering
ob_start();
// ... content ...
ob_end_clean();
header("Location: newpage.php");

// HTTP status codes
http_response_code(301);
header("Location: permanent/newpage.php");

// JavaScript fallback
echo '<script>window.location = "newpage.php";</script>';

Key Takeaways

Always call header() before any output and terminate with exit.