What are potential reasons for a frame redirection issue in PHP websites?

A potential reason for a frame redirection issue in PHP websites could be due to the use of the header() function after any HTML content has been sent to the browser. To solve this issue, make sure to call the header() function before any HTML content is outputted to the browser. 

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

Keywords

frame redirection PHP websites header function cross-origin security vulnerability

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