How can the issue of headers already being sent be prevented in PHP code?

The issue of headers already being sent in PHP code can be prevented by ensuring that no output is sent to the browser before calling functions like header(). This can be done by placing all header-related functions at the beginning of the script before any HTML or whitespace. Additionally, using output buffering functions like ob_start() can help prevent headers from being sent prematurely. 

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

// Place header-related functions here
header('Location: https://www.example.com');

ob_end_flush(); // Flush the output buffer

Keywords

output buffering ob_start ob_end_flush header error_reporting

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