What are potential causes for a BOM being added to a string variable in PHP, even if the file is saved as UTF-8 without BOM?

The issue of a BOM being added to a string variable in PHP even when the file is saved as UTF-8 without BOM can occur due to invisible characters or whitespace before the opening `<?php` tag in the PHP file. To solve this issue, you can ensure there are no characters or whitespace before the `<?php` tag by removing any unnecessary characters or whitespace at the beginning of the file. 

&lt;?php
// Ensure there are no characters or whitespace before the opening &lt;?php tag
// Your PHP code here

Keywords

BOM UTF-8 string variable encoding file saving

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