How can PHP developers effectively handle code that includes HTML and PHP mixed together to avoid the error message "Cannot modify header information - headers already sent"?

When HTML and PHP are mixed together, it is important to ensure that no output is sent to the browser before headers are set using functions like `header()` or `session_start()`. To avoid the "Cannot modify header information - headers already sent" error, developers can use output buffering to capture all output before sending it to the browser. 

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

// Your PHP code here

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

Keywords

HTML PHP header ob_start ob_end_clean

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