What is the significance of placing the header function before any other output in PHP scripts?

Placing the header function before any other output in PHP scripts is significant because headers must be sent before any actual output is sent to the browser. If the header function is called after any output has been sent, it will result in an error. To avoid this issue, it is important to always set headers at the beginning of the script before any other content is generated. 

<?php
// Set headers before any other output
header("Content-Type: text/html");

// Rest of the PHP code goes here
echo "Hello, World!";
?>

Keywords

header function output buffering HTTP headers content-type redirect

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