What are common causes of header modification errors in PHP scripts?

Common causes of header modification errors in PHP scripts include attempting to modify headers after content has already been sent to the browser, or attempting to modify headers multiple times in the same script. To solve this issue, make sure to call the header() function before any output is sent to the browser, and ensure that headers are only modified once in the script. 

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

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

// Output content
echo 'Hello, World!';

ob_end_flush(); // Flush output buffer
?>

Keywords

header modification PHP scripts errors causes common

Related Questions