What is the significance of using PHP tags and avoiding output before header() function calls?

When using PHP, it is important to avoid output before calling the header() function because headers must be sent before any actual output is sent to the browser. This is because headers contain important information about the response, such as content type and status codes. To prevent any accidental output before the header() function, it is recommended to use PHP tags appropriately. 

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

// Your PHP code here

header("Location: https://www.example.com");
exit();

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

Keywords

PHP tags header() function output buffering error message syntax error

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