What is the typical beginner mistake of "headers already sent" in PHP?

The "headers already sent" error in PHP typically occurs when there is whitespace or output before the header() function is called. To solve this issue, make sure that there is no output (such as HTML, text, or whitespace) before calling header() function. Additionally, you can use ob_start() function to buffer the output and prevent headers from being sent prematurely. 

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

// Your PHP code here

header("Location: https://www.example.com"); // Redirect to a new page

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

Keywords

headers already sent PHP output buffering syntax error

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