How can JavaScript be used in PHP to handle form redirection without causing header errors?

When using JavaScript in PHP to handle form redirection, you need to make sure that the JavaScript code executes before any headers are sent. This can be achieved by using output buffering in PHP to capture the output before sending it to the browser. By buffering the output, you can safely use JavaScript to redirect the user without causing header errors. 

<?php
ob_start(); // Start output buffering

// Your PHP code here

if ($formSubmitted) {
    // Output JavaScript code to redirect the user
    echo '<script>window.location = "redirect_url.php";</script>';
}

ob_end_flush(); // Flush the output buffer
?>

Keywords

JavaScript PHP form redirection header errors handling

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