How does the presence of HTML code in a PHP file affect the ability to send headers without encountering errors?

When HTML code is present in a PHP file before sending headers, it can cause errors because headers must be sent before any output is displayed. To solve this issue, you can use output buffering to store the output generated by the HTML code and then send the headers before displaying any content. 

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

// Your HTML code here

ob_end_clean(); // Clean (erase) the output buffer without sending it to the browser

// Send headers here
header('Content-Type: text/html');

// Continue with your PHP code
?>

Keywords

HTML code PHP file send headers errors compatibility

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