How can syntax errors or outputting HTML before a header redirect impact the behavior of PHP scripts after form submissions?

Syntax errors or outputting HTML before a header redirect can prevent the redirect from happening, causing unexpected behavior in PHP scripts after form submissions. To solve this issue, make sure there are no syntax errors in the code before the header redirect and that no output (such as HTML) is sent to the browser before the redirect header is sent. 

<?php
// Check form submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data
    
    // Redirect after processing
    header("Location: success.php");
    exit();
}
?>

Keywords

syntax errors outputting HTML header redirect PHP scripts form submissions

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