What are common reasons for encountering a "header-Problem" in PHP when redirecting after form submission?

When encountering a "header-Problem" in PHP when redirecting after form submission, it is usually due to output being sent to the browser before the header() function is called. To solve this issue, make sure that there is no whitespace or any other output before the header() function. 

<?php
// Start the session
session_start();

// Process form submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Handle form data

    // Redirect after form submission
    header("Location: success.php");
    exit();
}
?>

Keywords

header PHP redirect form submission error

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