How can cookies be created using PHP4 without encountering the "headers already sent" error?

When creating cookies in PHP4, the "headers already sent" error can be avoided by ensuring that no output is sent to the browser before setting cookies. This error occurs when there is any whitespace or text output before the `setcookie()` function is called. To prevent this, you can use output buffering to capture all output before sending headers. 

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

// Set cookies here
setcookie("username", "john_doe", time() + 3600); // Example cookie

ob_end_flush(); // Send output to the browser
?>

Keywords

PHP4 cookies headers setcookie error

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