How can output before the header() function cause errors in PHP scripts, and what are best practices to avoid this issue?

Output before the header() function in PHP scripts can cause errors because headers must be sent before any output is displayed. To avoid this issue, it is best practice to ensure that no content is echoed or printed before calling the header() function in your PHP scripts. 

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

// Your PHP code here

header("Location: https://www.example.com"); // Redirect using header function

ob_end_flush(); // Flush the output buffer

Keywords

output buffering header function PHP scripts error handling best practices

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