What are some potential solutions or best practices to prevent "headers already sent" errors in PHP?

The "headers already sent" error in PHP occurs when there is output (such as whitespace or HTML) sent to the browser before the header() function is called to set HTTP headers. To prevent this error, make sure there is no output before calling header() function. One common solution is to move all header-related code to the top of the PHP file before any output is sent. 

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

// Set HTTP headers
header('Content-Type: text/html');

// Rest of the PHP code goes here

ob_end_flush(); // Flush output buffer
?>

Keywords

output buffering ob_start ob_end_flush error_reporting php.ini

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