What are some best practices to avoid the "headers already sent" error in PHP?

The "headers already sent" error in PHP occurs when output is sent to the browser before headers are set. To avoid this error, ensure that no content is sent to the browser before calling functions like header() or setcookie(). One common practice is to move all header-related functions to the top of the script before any output is generated. 

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

// Set headers before any output
header('Content-Type: text/html');

// Other PHP code here

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

Keywords

output buffering ob_start ob_clean header error_reporting

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