What are the potential consequences of ignoring the "Cannot modify header information" warning in PHP?

When you see the "Cannot modify header information" warning in PHP, it usually means that there was output sent to the browser before the header() function was called. To solve this issue, make sure that there is no output (such as HTML, whitespace, or error messages) before calling the header() function. 

ob_start();
// Place this at the beginning of your PHP script to buffer the output

header("Location: https://www.example.com");
// This will redirect the user to the specified URL

ob_end_flush();
// Place this at the end of your PHP script to output the buffered content

Keywords

header information PHP warning consequences output buffering HTTP headers

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