How can the use of headers in PHP cause errors, and how can they be avoided?

Using headers in PHP can cause errors if they are sent after any output has been generated, such as HTML content or whitespace. To avoid this, make sure to set headers before any output is sent to the browser. One way to achieve this is by using output buffering to store the output before sending it. 

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

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

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

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

Keywords

headers PHP errors avoid functions

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