How can PHP beginners avoid common errors related to header information modification?

When working with PHP, beginners can avoid common errors related to header information modification by ensuring that no output is sent to the browser before calling functions like header(). To solve this, beginners should make sure to place all header-modifying functions at the beginning of the script before any HTML or whitespace. 

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

// Place header-modifying functions here
header('Location: http://www.example.com');

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

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PHP header information modification errors beginners

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