Why does the use of header() function in PHP result in the content being overwritten by the HTML page?

The issue occurs because the header() function in PHP must be called before any actual output is sent to the browser. If the header() function is called after content has already been sent, it will result in an error or the content being overwritten by the HTML page. To solve this issue, ensure that the header() function is called before any HTML content or output is generated in the PHP script. 

<?php
// Correct way to use header() function in PHP
header("Location: https://www.example.com");
exit;
?>

Keywords

header function PHP content overwrite HTML page HTTP headers

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