What potential issue is indicated by the error message "Warning: Cannot modify header information - headers already sent" in PHP?

The error message "Warning: Cannot modify header information - headers already sent" in PHP indicates that there is whitespace or output being sent before the header() function is called. This can be caused by spaces, new lines, or even UTF-8 byte order mark (BOM) characters before the opening <?php tag or after the closing ?> tag in your PHP file. To solve this issue, ensure that there is no output being sent before calling the header() function, and make sure to remove any whitespace or BOM characters from your PHP files. 

&lt;?php
ob_start(); // Start output buffering

// Your PHP code here

ob_end_clean(); // Clean the output buffer

// Now you can safely call the header() function without any whitespace or output being sent before it
header(&quot;Location: https://www.example.com&quot;);
exit;

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