What are some best practices for troubleshooting PHP code errors, such as headers already sent, before seeking help in online forums?

Issue: "Headers already sent" error occurs when there is output sent to the browser before calling functions like header() or setcookie(). To solve this, ensure that there is no whitespace or output before header() function calls. Code snippet: 

<?php
ob_start(); // Start output buffering
// Your PHP code here
ob_end_clean(); // Clean the output buffer
header("Location: index.php"); // Example header() function call
?>

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headers already sent troubleshooting PHP code errors online forums best practices

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